Build your first flying scale model - Appendix 3 - Notes and photos from Chris Strachan
I asked Chris if he could let me have some information about his fine flying Veron Comper Swift,
and was delighted to receive the following notes, plus two excellent photos. I love the idea of the half a nose block, and intend
to steal the idea when I next build a high thrustline model! Chris is a very experienced and successful competition flyer, both in rubber
duration and scale classes, so his advice is certainly worth listening to. You can also see he is a very neat builder whose models are always immaculately turned out.
"I have measured my Comper and find that the wing
incidence is 3.2 degrees relative to the tailplane which is flat on the
longerons as shown on the plan. Measuring the plan I reckon the incidence
is about 2 degrees. I do not remember how I achieved this. Probably by
sanding the wing seating after building as I am usually pretty careful to go
for 3 degrees.
CG without motor is at 46% (to explain to newcomers - this figure
refers to the percentage of wing chord measured from the leading edge - in this case a little bit forward of half way).
Motor is 90 mm in front of CG and 110 mm behind
so I reckon that must take it back to about 50% - which is further back than
I would expect to get away with.
Other statistics for what they are worth.
Weight 24 grams including 3 grams of nose weight but without motor.
A 7" Peck prop is fitted.
Must have 1/16" wash-out on left wing tip (To explain this a bit more - Chris has his model set up to fly right, so
the washout on the left wing tip helps to keep the left wing down in the right turn, and prevents
it from spiralling in).
Motor is 4 strands of .100" rubber 16" long, pretensioned, 1000 turns.
You need to be careful fitting a proper nose plug. If you
go for a full depth one then the thrust line is so near the top that you
need a very good fit if the bottom in not going to swing forwards on high
turns. I use a half height one which is not too bad.
Biggest operational problem is that the nose is a bit narrow so you can get
bunches fouling inside. Hence the quite short motor.
Still I reckon it is an ace design - best performer of the Veron range and a
good selection for your feature."
In case you were wondering about the finish on the model, it was covered in blue tissue, then airbrushed
with HMG royal blue cellulose. The lettering is masked and sprayed with silver "brushing enamel" from
Halfords (a car accessory chain in the UK). Apparently, despite the name, this is in fact a cellulose paint.
Thanks Chris - very useful stuff and most appreciated!