Experimental Aircraft Models
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Engine, Prop and Muffler
The model has flown successfully on an OS .91FX running a two blade 14x6 APC pusher prop. This
proved that the model flies well ‘on the wing’ and is as efficient as the full-scale aircraft. It is
not
adequate for any aerobatics or short runways. It is not our recommended set-up.
We recommend the Webra Speed 1.20 two cycle engine with the integral fuel pump. The Webra is
a tried and true ‘bullet-proof’ engine and powers the model with authority. Turning an Airmaster 3
blade 14x6 pusher prop the model accelerates quickly on grass and is capable of basic aerobatics.
We recommend a fuel pump because the fuel tank sits approximately 20” forward of the engine and
changes in aircraft attitude affect mixture.
Do not assume that more power is better, we already did that for you with the 1.20 size engine
recommendation. The engine sits well aft of the CG, and any changes in weight of engine are
further paid-for by increases in ballast in the nose.
Note that as a ‘pusher’ the exhaust of a ‘normal’ Pitts style muffler points in the wrong direction. We
have custom Bisson mufflers for the Webra engine, which we include in our ‘Firewall Aft Kit” and
which are available separately.
Other Stuff:
CA Adhesive (Thin)
Propane Torch
CA Adhesive (Medium)
Solder & Flux
30 Minute Epoxy (4 oz. min.)
Foam Servo Mounting Tape
5 Minute Epoxy
Rubbing Alcohol
Building the Wings
Installing Aileron Hinges
The control surfaces on the wings, canard and winglets are not yet permanently attached. In this
step you will be positioning the ailerons, remove and prepare them for gluing, and permanently
re-installing them on the wings.
Note: At the tip of the wing the plywood winglet mounting plate is shipped already taped in
position. Leave this in place because you’ll need it there later.
1) Retrieve the hinges (No. 32) from the hardware pack and the right wing.
2) Insert a pin through the middle of the hinges and
insert them half way into the pre-cut slits in the wing.
Slide the ailerons into place.
Position the hinges side to side so all hinges
fit & the space between the aileron ends and
the wings is equal – use a razor knife if
necessary to widen or deepen the slot if
necessary.
Check that the vertical location of the
factory cut slot allows the two ends of the
aileron to sit flush with the top surface of
the wing. Cut a new slot if it does not meet
your building standards.
