Douglas Sheppard - Scale Modeller
I've compared the pix to a photo of the completed model that came with
the advertising blurb I sent for prior to buying the kit.
It looks as if mine's a 109, not a 109B. The outline is exactly the
same as the 109 as far as I can see and the plans don't show the foot level
vision panels. (Major headache avoided.) I was loathe to cut them out as
it would significantly weaken the structure forward of the wings, especially
as all the weight (batteries, receiver, etc.) will be as far forward as
possible to balance the model.
Beefing up the area around the vision panels would ruin the scale effect
of the cockpit, a magnet for any rubber-necker, and the large area of the
canopy will just be begging for everyone to have a good look inside.
My plans don't show the windows at the rear of the canopy either, however,
cutting them out is not a problem.
This area is not under the same stresses as the forward vision panels
would be and there is bags of room to hide any structural reinforcement
required.
The plans don't give any dimensions for the full size, but the model
has a span of 4m 34.5cm and is advertised as 1/4 scale, so if yours is
reasonably close to 17m 38cm then I think I've won a watch!
Here are some pix of the model, doesn't look like much yet but there
is the best part of a years work (on and off) in getting to this stage.
The fuselage minus the cowl and rudder.
The dark outline around the panel is epoxy putty. The fit is perfect.
At the moment I've got to put my hand inside the fin to open it. The fit
is too tight to slip anything into the edge of the panel to lever it open!
The rib is attached to the fuselage with photo mount spray and the wing
is fitted against it. Once everything is suitably masked off, and the wing
is located in place, 4 hour epoxy resin is poured along the join and allowed
to seep between the wing and rib. When fully cured, the wing is removed
(hopefully with the rib permanently attached) and cleaned up. Any remaining
unevenness or gaps are filled with epoxy putty and sanded to give a perfect
join between wing and fuselage. Well that's the plan.
Servo motor mounted in fin.
Hamilton Radio Modelling Club
http://www.hrmc.co.uk/
Scottish Aeromodellers Association
http://www.saaweb.org.uk
Douglas sent the following (March 02):
The model is the David Derby 1/4 scale semi-kit advertised as true scale.
It consists of a glass fus, cowl, seats, canopy frame, instrument panel
blank and wheel spats. The wings, stab and rudder are polystyrene cores
covered with obeche veneer with all the control surfaces requiring to be
cut
out and faced with balsa., the rest is up to me.
I've spoken to Dave Derby [of Texas] by phone, however, he bought the
moulds from someone else (now deceased) and doesn't know what variant it
is. But the quality of the kit is excellent and ,as they say, the
price was right so I can't really complain.
The lump at the front will be I/C. Either an O.S .91 pumped four stroke
or an S.C .120 four stroke. My first choice will be the O.S as it can be
totally enclosed within the cowl, but the more I look at the model the
more I think it may be a bit marginal for power. The recommended power
range is .70-.120 four stroke and Dave assures me that his kit flies beautifully
on a Laser .100. I guess it will be a case of "suck it and see."
I already have an Arianne motorglider. Not a scale model, but large
as sports models go. At 10.5ft wingspan. it is grossly overpowered on a
.51 four stroke. Take off and climb out is at 1/2 throttle and soaring
is at slow idle so I may get away with it.
The trick is to find the idle point where there is no thrust or braking
effect from the prop. It takes a bit of time and trial & error to find
the correct setting (and experimentation with different prop pitches).
It will never be perfect but who can tell when you are several hundred
feet from the model.
The construction is progressing at a reasonable pace (I am not renowned
as a fast builder) and it is at the following stage:
WINGS
Leading and trailing edges fitted. Tip blocks on but not shaped (don't
know the correct profile yet, one of the things I'd like a photo of.) Control
surfaces cut out and faced. wing joiners and dihedral braces manufactured
and fitted. Only have to glass cloth the wings and fit the servo boxes
& air brakes.
FUSELAGE
Reinforcing formers, dihedral brace boxes, tail-wheel mounting and
stab seating all fitted. Elevator servo access hatch built and servo fitted.
TAIL FEATHERS
Complete and ready for painting.
I am now at the stage where I have to start adding the scale detail,
so here goes,
I need the following details;
COCKPIT
Instrument panel, foot well & rudder pedals, seats and harnessing
details, L & R cockpit sides, rear bulkhead, canopy and catches.
WINGS
Tips, root to fus junction, airbrakes and any mass balances if fitted.
COWL
Front view, L &R sides. top & underside. (looking for hinge
details, air intakes, etc.)
UNDERCARRIAGE
Leg to fus junction, spats (How are they attached to the legs?), any
brake pipes, etc.
FUSELAGE
Any access panels and their location.
Any info/warning stencils on the exterior.
Complete aircraft from all sides.
|
