Amiot 143 (oz13169)


Amiot 143 (oz13169) by Jacques Cartigny - plan thumbnail

About this Plan

Amiot 143. Free flight scale model twin French bomber for electric power, with 2x KP-00 motors.

Direct submission to Outerzone.

Quote (translation from the French text): "This is an interesting subject for an electric model where weight is a determining factor. With its large surface and square shapes, we can expect a light structure. The empennages are small, but in electric, the power does not vary too much, so it is not too penalizing. On the other hand, there is molding work (7 parts) and the adjustment is delicate.

Wing: Construction is quick once you trim the ribs. These are obtained by molding on a block two thicknesses of 7/10 wet and glued to the vinyl. Cut to the width of 15/10, these ribs are cut at the front by an additional 2 mm for each position on the trapezoidal part to obtain a flatter profile at the marginal. The somewhat unusual shape of the profile with the pointed leading edge conforms to the upper surface of the real one, only the lower surface has been flattened. My model does not have fins for weight and simplicity reasons, but they are well paid statically and handy for adjusting the turn. Otherwise do not forget about the twist.

Apart from the sides in ctp 3/10, the fuselage is a body receiving some fairings. It is completely covered with paper to ensure a homogeneous finish after painting. You have to leave a large part of the background unfinished to install the windows from the inside after finishing and total painting (otherwise, you have to hide them, which is delicate). This also allows the batteries to be moved during testing, to balance without ballasting. The complete background is only laid and painted after complete finishing.

My model being midnight blue it was covered in Japanese blue, but the majority of Amiot were chocolate brown, although a few were hastily camouflaged in three tones during the war. The matte Tamiya paint gives the paper a very realistic appearance. The cabin and turret uprights are made of 80g paper also covered with japan and painted (both sides) before cutting. Neoprene bonded, beware of difficult to remove stains.

Note: The model I chose has the underside of the rounded nose, which gives a lot of work for the molding and to properly fit the paper to it. There are Amiot 143 (first version?) Where this part is at a sharp angle, which allows a developable glazing and a cleaner paper gluing. There are also two possible positions for the rear turret and other variations of detail to be taken from photos.

The model turned out to be marginal with two 50 mAh NiCad batteries (but a good option if you can build a little lighter) and much better with three. It included old KP 00s whose adjustable pitch propellers are practical for the first tests but beware of misadjustments! Newer models have a screw mount that allows you to try out a wider variety of propellers.

The flight is definitely better with a LiPo of 135 mAh, but then you need a timer like the Zombie from Atomic Workshop which allows you to limit the flight times and especially to finely adjust the power. As this timer must be accessed on each flight, it can be placed under a removable turret fixed for example by a mini-magnet (the Zombie leaves 10 s before starting the motors).

With an almost mock-up dihedral, my model could turn left or right with great sensitivity to the fin setting. Turning to the left is visibly more stable, and a slightly stronger dihedral (20 to 25 mm) would be a certain safety. CG at 20%, significant breaker (5 to 7 °) and a little shift to the right (3 ° on the right engine). Do not forget the twist (see plan) or a slight deflection of the ailerons (+ 5 ° to the left and -3 ° to the right for example). As always, ensure a good glide which will certainly require raising the trailing edge of the stab control surfaces by 4 to 5 mm. It is wise to protect the nose for the first few tries and not to mount the front turret."

Supplementary file notes

Article, in French.


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Amiot 143 (oz13169) by Jacques Cartigny - model pic


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User comments

Have added a source link to the datafile now. This plan (it seems) is a direct download from the most excellent website at: thanks to Miguel for help with this.
SteveWMD - 14/07/2021
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