Photo gallery 12 - my latest models

SortaSenator

It took me several years, but I finally got round to building a Sortsenator Bostonian from my plan elsewhere on the site. As mentioned on the plan download page here I discovered the centre section needs slightly shortening to keep the span under the 16" limit. I took out 10 mm, which turned out to be a little more than necessary.

Finish is Esaki tissue, using pre-shrunk tissue for the tail surfaces to avoid warping. To do this, I glue the tissue to a simple hard balsa "picture frame" using glue stick, and then waft it over a boiling kettle. It then goes drum tight and usually distorts the frame a bit. The tissue is cut out of the frame and applied as normal. It still retains some ability to shrink after application, which helps with wrinkles, but nowhere near as much as untreated Esaki.



Prop was a Czech Tern copy, and power one loop of 3/32" rubber. Trimming was satisfyingly easy - it wanted to turn right so I encouraged it with the fin trim tab, and I just needed a bit of tailweight to get it climbing up towards the roof of the small school hall we use for indoor flying. Best flights were approaching 50 seconds. If I could be bothered to scrape the prop, I could get rid of the weight at the back, and have a lighter model. Anyway - nice to know it flies!


Boeing P.26 Peashooter

As some of you will have noticed, I often tend to build models of aircraft that appeal to me, rather than ones that will be competitive in a particular class. I've wanted to build a Boeing P.26 for years, and eventually decided to do a Peanut. In its favour is plenty of wing area, but the chubby fuselage means it was never going to be a lightweight, and those enormous wheel pants looked like they would be very vulnerable in a heavy landing.



The model was based on the larger Doug Wilkey design as it looked accurate, and was a proven flyer at the larger scale. I scaled the plan down to 13" span, using 1/20 and 1/32" balsa instead of 1/16". The wing centre section is very strong, and the wheel pants are glued rigidly to this - I decided against trying to spring them. All control surfaces were built separately and hinged with soft wire. On this model I constructed a full set of engine cylinders mounted to a central block, and added a laminated cowling, formed from three layers of 1/32" balsa wrapped round a former. Once the glue was set, the outside was sanded to a streamline section. This allows you to look through the engine between the cylinders, which is more realistic than my usual method of solid discs with relief cylinders.



The finish is my usual Xtracolor enamel and markings cut from painted decal, apart from the fuselage badge, which is a printed decal using artwork from a reference book. Developing the shapes for the gold fuselage stripes was tricky - a case of trial and error with paper patterns till I got the shape right. Then I scanned the patterns and imported to Autocad so I could trace and mirror them for left and right hand. Rigging is fishing nylon, painted metallic grey after fitting.

I'm happy to report it did fly OK at the Indoor Nats, though rather fast, and I got it circling left within the sports hall walls. Best flight was only 21 seconds from a hand launch, but it's a start. I broke the outer wing panels off a few times due to taxiing accidents after it landed, so some of the rigging pulled out, but repairs were simple and happily the model came home still looking fairly pristine. Now to add the mssing engine exhausts!


Chrislea Super Ace Bostonian

Bostonians seem to be ideal models for flying indoors in relatively small halls, such as the school sports hall we visit monthly in Newbury. So, after finishing the SortaSenator, I drew up a new model based on the Chrislea Super Ace. When the fuselage was drawn up to meet the dimensional rules, I was pleasantly surprised to find that it came out very close to scale, and even the wing chord was correct. Of course the span had to be drastically cropped to meet the 16" limit, but that's what adds to the cartoonish appeal of the class.



The simple structure is evident in this view of the unpainted model. Without the prop, the model is a tail sitter - hence the addition of a screwdriver in the nose to keep it on its wheels!



I know it's a bit daft to airbrush a fun model like this, but I wanted to give it a simplified version of the full size scheme. You could, of course, use silver and blue tissue to do the same thing. Stripes and registrations are cut from blue-painted decal sheet.

You'd think a simple high wing cabin model like this would trim out easily, wouldn't you? Well in this case, no it didn't! I thought the fins looked big enough, but the tail moment is quite short, so the model was terribly laterally unstable, and could not be persuaded to circle at all until scraps of paper were attached to both fins using double-sided tape to increase the area. So, I've drawn up a pair of larger fins, and we'll see what happens.

Postscript April 2016

I'm happy to report that the larger fins did the trick, and the model now flies round in stable circuits. So - no excuse to not draw up the plan and put it on the site now!


Jodel D18

After doing an in-box review of the Vintage Model Company Jodel D 18 here I couldn't resist starting it, and it proved to be a really quick build, with all the parts fitting together perfectly. Even the paper pattern for the front cowling fitted really well (incidentally, the open sides of the cowling proved a useful place to hide noseweight). The large canopy was a good fit, though a bit tricky to trim as there are no defined lines to cut around - it's a case of snipping off a small bit at a time until you get it right. With such a large canopy I felt I needed somebody in there, even if he was only a profile pilot. He was actually taken from a photo on the internet of this actual plane - I just cut out a left and right hand version and glued them together. He should look reasonably effective in the air, anyway.



Here are the model bones before covering - the structure is designed for foolproof assembly with plenty of notches to give a good gluing area. I sanded off any laser burn marks where they would be facing the tissue. I covered with Esaki as normal but used it pre-shrunk on the tail surfaces to avoid warping.



Finish is Humbrol enamels with all markings cut from painted decal sheet. Note the trim tab bent up on the right wing to hold it down in the left hand turn.

After breaking the wing off at Old Warden in 2015, I was able to fly it indoors at Peterborough in April 2016, where I'm happy to say it circled in a most pleasing fashion. I found I needed to add a 1/16" sq. gurney strip under the whole of the left wingtip trailing edge (i.e. outboard of the dihedral join) as well as a tab bent up on the right wingtip trailing edge. This combination cured the tendency of the model to spiral in to the left.


D.H.83 Fox Moth

With the Curtiss Hawk becoming a too familiar sight at the BMFA Indoor Nationals, I decided it was time for something new. I also wanted to try something with a lower wing loading than my usual open rubber models, so get a slower, more realistic, flying speed. I'd fancied having a go at one of the late, great, Dave Rees's designs for a while, so I thought, why not build one and fly it indoors?

The design I chose was the D.H. 83 Fox Moth, a type I've flown successfully before as a peanut scale model. Thus, I had all the necessary documentation to hand, especially if I finished it in the same scheme. Span is 29 inches, so larger than normal for me, but I thought it should be fine in a large sports hall.



I started with the wings, as I've never built a set using this construction method before. I used two laminations of 1/32" balsa for the upper rib caps rather than steaming 1/20" square as shown on the plan, on the basis it would be more robust. The two deep spars and webbing give an amazingly stiff structure at a relatively light weight (the upper panels are just under 3 grams each). Changes to the plan involved adding separate ailerons to the lower wings which would be hinged, and making the lower wing panels separate, attaching to the fuselage sides as per the original, rather than having a one-piece wing running under the fuselage.



Here is the complete balsa structure showing another change from the plan, which features stringers for the upper fuselage decking. This was sheeted on the original, so for greater realism I covered the upper fuselage with very light 1mm balsa sheet. I also reworked the nose, omitting the foam that Dave used, though this was down to personal building preference rather than anything else.



The model was covered in white esaki tissue, pre shrunk on a frame for all the rather fragile tail surfaces.



All the struts were made from laminations using a centre core of thin plywood with balsa either side, sanded to a streamlined section. 1/32" ply for the cabines and 1/64" for the interplane struts - no wire was used anywhere in the struts to save weight. The wing rigging is fishing nylon (painted blue as per the original), hence functional, whereas the control surface cables at the rear are lycra thread, coloured black with a permanent marker before application.

The model was airbrushed using my favourite Xtracolor "RLM Silver" enamel thinned with dope thinners. You don't need to apply much to obtain a solid looking finish. All the markings, with the exception of the SMT badges were cut from painted decal sheet and applied to the silver tissue. I used Daco products decal softener to get them to snuggle down properly. Window frames were also cut from silver painted decal sheet.



The photos of the finished model show the scale prop I carved to keep the static judges happy - for flying I used one of the white Easy Built 10" props, which works really well. Power is 2 loops of 3/16" rubber and all up weight 97 grams including rubber and noseweight. To put this into perspective, each wing panel is close to 50 sq. inches.

Three weeks before the 2016 Indoor Nats I drove two hours up to Peterborough, with the model unfinished but flyable, to see if I could trim it out. It proved surprisingly easy, as it just flew so slowly. Any trim chnges were very gentle, and the model proved very easy to catch if it started heading towards the walls. It needed a bit of noseweight, some left rudder (glued in place once a suitable turn was achieved) and some down aileron on the left wing.

Here is a video taken by Russ Lister on the day.



Needless to say I drove home extremely happy - definitely worth the journey!


Short Seamew


In order to maximise the number of classes I could enter at the 2016 FAC Nats, I wanted a model I could enter in more than one event, with the proviso of course that I could fit it into my model box. I'd had an idea running round my head for a while that an enlarged version of my Peanut scale Seamew could go well, but moulding the blown canopies put me off a bit. However, Lindsey Smith then produced a canopy moulding for the 22" span Frog Senior Series Seamew, and when I enlarged the peanut to 22" span, the tricky bulbous parts were exactly the correct size. I'd have to bend a windshield from flat sheet, but that didn't look too difficult.



The main structural difference to the peanut model is the use of a cracked rib wing. I left all the fuselage formers in the same positions, but added one or two extra stringers. Also some soft balsa in-fills for some of the trickier contours. The distinctive radome was carved from soft balsa and hollowed out with a rotary tool. To strengthen the wing to fuselage join, I added a box across the fuselage to accept interlocking balsa tongues mounted in the wing centre sections.

The separate removable outer panels are only required because I have to fit it in my model box - normally a model this size would be one piece. It means adding extra weight, but it can't be helped



Here she is ready for painting - covering is white Esaki.



Finish is my usual Xtracolor enamels which go on gloss, allowing the decals to go on without silvering under the clear film. A final coat of acryic varnish after decal application kills the gloss and seals everything nicely (after masking the canopies first of course). This view shows the wing slats quite nicely, and the underwing serials cut from black painted decal sheet. For the roundels, firstly white discs were masked and painted onto the model, then red discs and blue rings cut from painted decal sheet using an Olfa Compass Cutter were applied over the top.



The finished model weighed 43 grams without rubber, but including the 8" Easybuilt plastic prop. Wing area is 90 sq. inches, so I'm reasonably happy with that. I'm planning to start with 2 loops of 1/8" rubber and see how it goes.

Update August 2016

A little noseweight was required and the model wanted to fly right, which was fine by me. To keep the right wing up in the turn, 1/16" sq. "Gurney" strips were added under the right wing trailing edge. I've found you need to launch with the right wing down a little to get it into the turn, especially when fully wound.



Two loops of 1/8" rubber proved to be the ideal power, and to get extended duration, I increased the length to approx. 3 times the peg to hook distance. To avoid the problem of the rubber climbing up the diamond prop hook, I fitted a new reverse S hook, which did the trick. With the longer motor I was able to get a thermally assisted 2 minute flight at the 2016 FAC Nationals - my first ever at the event.

Here's the Seamew in action at the Oxford Model Flying Club "Scale Fest 2016" meeting - well under maximum winds, but the open rubber class here was judged on realism, not duration. Thanks To Monique Lyons for the video.




Cessna 310


As the jury was still out on the ability of the Beriev to be a consistent performer, I thought I'd better get a back-up FAC scale entry started for the 2016 Nats. I've loved Chris Starleaf's 29 inch span Cessna 310 design since the plan was published in FAC news, and it's a proven class winner, so really it was a very simple choice.



The fuselage was a fun build, with the upper structure built "in the air" above the basic box. I love the way Chris has captured the shape of the fuselage using just a minimum of sticks. Wings are cracked rib type, with the usual tongues and boxes outboard of the nacelles to allow the outer panels to be removed for transport.



Chris made his tip tanks out of heat formed plastic foam plates, but I thought I'd do them in stick and tissue using 1/20" balsa, to give the same translucent effect as the rest of the airframe. I was pleased with how they came out, but have proved a bit vulnerable to wingtip landings (I now have one or two cracked stringers).

Finish was airbrushed Humbrol gloss yellow enamel over yellow Esaki tissue, with the fin being blue enamel over blue Esaki. All markings are cut from painted decal sheet.

I finished the model the Saturday before I flew out to Boston, so didn't have time to put on all the panel lines and door outlines that I wanted to. This meant that I took it out to Geneseo completely untrimmed.

Final weight was 54 grams without noseweight or rubber, but including the two scraped Czech 6" plastic props.



Test flights commenced with a loop of 1/16" and a loop of 3/32" in each nacelle, about 2.5 times hook to peg distance and braided. After adding some noseweight and a bit of downthrust, the model looked quite stable, but was turning a bit sharply left and not climbing away. A length of 1/16" sq under the left wing trailing edge worked a treat in opening up the turn by keeping the left wing up.

On the Saturday of the competion I was delighted to get a 64 second flight on 1500 winds. To get any more duration I think I'll need longer motors, as they felt pretty tight at those winds.

Here is a video taken by Monique Lyons of the Cessna in action at the Oxford Model Flying Club "Scale Fest 2016" meeting.




Waco C.7



This is a peanut scale plan by Paul Boyanowski which I decided to build to take out to Geneseo in 2016 - the design is light, and it should fly well. It won't have the level of detail I might put in a BMFA peanut, and it certainly doesn't have scale rib spacing, but for this model, duration is he main criterion.



Structure is mostly 1/20" square with ribs and formers from 1/32" sheet. The rudder and elevators are hinged - a feature not on the original plan, but useful for trimming.



Here is the model covered in Esaki tissue, ready for painting. My chosen scheme is an aircraft operated by the SOHIO Oil Company, which has white fuselage and red wings and elevators, so the components have been covered in the appropriate colored tissue to suit the final airbrushed colour. Tissue preshrunk on a frame was used for all the tail surfaces to avoid warps. You can see the removable nose plug including the engine cylinders modelled in relief.



Final weight without rubber came out at 15 grams, so heavier than I'd hoped. I blame that caked-on enamel paint finish.

The model had its first hops in a local school hall, and it looks pretty hopeful - a couple of steady circuits were obtained once the rubber cross section had been upped from a loop of 3/32" to one of 1/8". I think this will be fine for outdoors. Needless to say I finished it too late for the 2016 FAC Nats, so it will have to wait till 2018 now for its competition debut.


Peanut scale Blackburn Ripon


This was yet another attempt at a lightweight peanut for BMFA competition. It's based on the (accurate) outlines of my Dime Scale Ripon, but the fuselage sections have been improved using extra stringers, and the flying surfaces have scale structure.



To get a scale rib spacing at minimum weight, about two thirds of the ribs are indicated only by sliced upper ribs only the remaining third have top and bottom strips. All four ailerons are hinged (half a scale point per separate control surface surface is the reason for this!) The rudder and elevators are also hinged.



Total weight without noseweight or rubber came out at 12.6 grams, which was really pleasing. The paint finish is my usual Xtracolor enamel, but this time RAF High Speed Silver rather than RLM Silber. Most markings are cut from painted decal sheet, including the upper wing checks. For a change I used an Easybuilt 5 inch prop instead of my usual cut down Tern 6 incher.

Initial flights were at the pre-Nats trimming session at Peterborough in 2017 and somewhat to my amazement I seem to have finally managed to design and build a competitive and very stable peanut, something I've been trying to do since my long-retired Fox Moth. It needed some noseweight, but flew from the off in nice left hand circuits, and the only real challenge seems to be choosing the correct rubber for maximum duration. I really thought Id need a loop of 1/8 but that was too much, so went down to 0.109, which still got it up to the roof with 900 winds. So, a final change to 0.100, which hit the roof after 1200 winds. Maybe 3/32 will be the sweet spot? (about 0.094 to save you doing the maths). Oh, and it takes off as well, so that gets me an extra 10 seconds.

Now I know it flies, I've added the plan as a download here. I think it would also make a nice model scaled up, for instance 22 inch span would be 1/24 scale.


Blackburn Shark

This was not a model I had planned into my schedule its all Greg Wests fault. He sent me a pdf of the plan, which is a pre-war Comet design, and I knew I just had to build it. The wingspan is 34 inches, and the structure is incredibly light. It is amazing just how little wood some US designers were putting in their models compared to the bricks turned out by some UK companies. I thought this model had the potential to be a real floater for outdoor flying when the weather is calm. There is more structure in some peanut scale models than this, but what there is in this design looked to be in the right place. The Warren girder struts would help to keep the wings rigidly aligned, and the main challenge seemed to be the undercarriage, and how to make it more crash resistant. Greg has built one and successfully flown it - you will find a video of it in action in the 2010 FAC Nats report.



I added an additional turbulating 1/16" square wing spar between the main spar and the leading edge. The kit design has a single 3/32 x 3/16" main spar shown on the bottom, which I converted to two 3/32" square spars, one on the top and one on the bottom. After oriinally building the wings with the dihedrsl shown on the plan I later decided to re-cut the joins where the outer panels join the centre section and put in a touch more dihedral before replacing all the gussets.

The cowl is wrapped with soft 1/16" sheet rather than notepaper, to make it more robust. Also I put in a fuselage-mounted wire landing gear to run inside the front undercarriage struts, so it would deflect backwards in the event of a heavy landing.



Here is the model covered with white Esaki tissue and ready for painting. The wire undercarriage legs were sheathed in balsa, and the rear legs, which are attached rigidly to the balsa fairings next to the wheels, are free to slide into slots in the fuselage as the undercarriage deflects backwards. By a lucky coincidence of geometry, there is practically no rotation of the rear leg at the wheel fairing end as it slides back into its slot. My balsa wheels are larger than shown on the plan to make them closer to scale.



Adding the many details shown on the plan was rather satisfying, including the torpedo and its hangers. The torpedo is basically a rolled 1/32" balsa tube with hollow soft block sections front and rear. The rear block was shaped, then cut in half and hollowed out with a rotary tool, getting the walls as thin as I dared before gluing the halves back together. The completed item came out at just 3 grams.



Initial flights were made at the pre-Nats trimming session at Peterborough in 2017. Id not planned to fly the Shark indoors, but in the light of how well my big Fox Moth had gone, I thought Id give it a go. It came out a bit heavier than the Fox Moth, at 100 grams without rubber, but it does have a fair bit more area. The Shark has no movable control surfaces so trimming was done using just gurney strips, rather than add unsightly trim tabs. I started off with a motor of 2 loops of 3/16 rubber, but soon realised this wasnt going to be enough, and ended up adding a loop of 1/8 to the motor. To get it to turn within the confines of the hall, a strip of 1/16 square balsa was added to the left side of the fin (model was trimmed to circle left). A relatively short length was needed. A bit of noseweight and downthrust was needed to cure a gentle stall, and then the model would take off OK, but not climb much, and the left wing was keeping very low, leading to an extended taxi on one wheel after landing. If the model had been equipped with hinged ailerons, I would have dropped the left one and/or raised the right one to cure this, but on this model it was time for more Gurney strips. By gradually adding approx. 20 mm long strips of 1/16 square balsa under the left wing trailing edges you could see the left wing dropping slightly less with each flight, and the model climbed a bit higher every time. It took six additions before I was happy with the flight pattern. What was impressive was how the Gurney strips under the wing had no noticeable effect on the turning circle the plane just flew in a more level attitude.



Here is a video of the best trimming flight from the Peterborough session - thanks to Monique Lyons for the footage.





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