Poppet (oz3911)

 

Poppet - plan thumbnail image

About this Plan

Poppet. A 37 innch wingspan free flight sport model, for engines up to 1 cc. From Model Aircraft, August 1960.

Quote: "A free flight sportster for engines up to 1 cc. Poppet, by Colin Read.

I designed Poppet as an all-weather sports model, capable of good performance, and yet able to withstand rough treatment. It will fly in most weather conditions, and was in fact trimmed in very rough conditions earlier this year.

The construction of the model is commenced by cutting two fuselage sides from 1/16 in medium sheet balsa. Two 1/8 in sheet doublers are cemented inside the sides at the nose, after which the formers are cut out and the undercarriage wire bent, bound and cemented in place. The under-carriage former, bearers and fuselage sides should then be securely cemen-ted together. Next join the fuselage sides together at the rear, using a strip of 1/8 in sq as a rear post. This strip is important, as without it the underfin section will tend to sag. Carefully add the remaining formers and wing mount (M.1) and firmly cement the x 1/8 x 1/4 in hard balsa to the inner face of the fuselage sides to form the cabin.

When you are satisfied that the fuselage is perfectly aligned (particularly the triangular rear end), sheet the top and bottom, with the grain running from side to side. Add the tailplane mount, and fuel tank, fuel proof the inside of the engine mount, and add the upper cowling block. Finally, add the sheet around the engine, leaving an opening to enable the engine to be 'choked,' and cut a small fuel drain hole in the underside sheeting. It will be seen that with a Frog 0.80 the cylinder just protrudes below the fuselage underside, and this helps cooling considerably.

The wing and tailplane are built directly on the plan in the usual manner, take care to achieve a neat and warp-free framework and re-member that the fin and tailplane should be built from very lightweight balsa.

Attach the cabin acetate after covering the fuselage with coloured Modelspan, this method gives a much neater finish, especially when a black tissue trim is used over the cabin frame. The original Poppet was covered in yellow lightweight Modelspan, using black tissue trim and three to four coats of clear dope.

Balance the model by supporting it on the finger tips under the mainspar. Add weights to nose or tail until the fuselage remains hori-zontal.

Prior to your first flight ensure that there is a little downthrust and right side thrust, this will prevent any violent manoeuvres. Poppet should fly a left spiral under power and glide to the right. Use the upper fin as a trim tab, but only make small adjustments at a time."

Update 05/04/2019: Replaced this plan with a clearer copy (patterned background removed) thanks to TonyP.

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Poppet - completed model photo

Datafile:

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User comments

Hi Steve, a few more photos for the Outerzone. The Poppet it flies well - nice small model for PAW 55 [see more pics 003-006].
Joost - 12/08/2014
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Scaling

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