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Sep 14, 2021, 11:07 PM
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I get small heat shrink from a "Batteries & Bulbs" store. I use it in rebuilding 'bladder" tanks.
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Sep 15, 2021, 06:39 AM
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1/2A Nut's Avatar
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Hi Greg,
Here is what I ordered:

Heat Shrink Tubing 3:1 Marine Grade Wire Wrap Adhesive Glue Lined Waterproof

https://www.ebay.com/itm/13385518098...53.m2749.l2649

Looks promising I have never tried heat activated glue lined marine grade. Sealing attributes,
improved conforming, staying put with no lifting / expansion over time should give peace of
mind when tucking away the fuel tank.
Sep 17, 2021, 12:34 AM
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RX 3.3v cutoff, will use 3.7v 1S battery great low weight.
RTF 1.8oz goal / est. battery in the mail 2.4g less connector.
110 mAH should be good for five 4cc pattern flights. Est. 60 mAH
used per field session. Nano 1 / 4.8v 80mah ni-mh 4 flights/ trip.
Last edited by 1/2A Nut; Oct 18, 2021 at 06:05 PM.
Oct 17, 2021, 10:57 PM
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1S Battery came in the mail very light to go with the finished 4cc / 3g tank.
A new level of smaller lower weight gear for improved TD .010 performance.
The sticky marine heat shrink improved retention of the stopper and sealing.

Last pic possible arrangement. The battery could be heat shrunk to the RX.
A micro switch could be incorporated along with a charging jack. The switch
arm could stick out the fuselage for access. Iso-foam double sided tape to hold
the RX to the floor of the fuselage with access window for the charging port.
23.1g towards total weight goal of 1.8oz / 51g - great narrow arrangement.
Last edited by 1/2A Nut; Oct 18, 2021 at 11:53 PM.
Oct 19, 2021, 10:08 PM
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We need a thumbs up button haha. Good looking tiny light weight setup that's for sure.
Oct 19, 2021, 11:47 PM
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Thank you yes very small IC RC right off the shelf from ebay.

Servos on tap made it to the all up RC pile including the micro switch.
This makes up the weight of 1 servo for an .049 plane! The TD .010
should haul the plane with some vertical.

Last edited by 1/2A Nut; Oct 20, 2021 at 03:56 AM.
Oct 20, 2021, 05:01 AM
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I know you're into your speed and that's what this section is about but you've just shown a great option to fit out a nice scale plane or just a nice general sports plane that needs to be built light.
Oct 20, 2021, 07:34 PM
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Yes for those willing to step down to the tiny 1.25mm Molex plugs regardless
of plane type the engine will perform better. The gear allows for flying smaller
planes / lower wing loadings. Last TD .010 project 2.2oz / 28 Sq. in.

21.6sq. in. 16" span is possible with a speed ship @ 1.8oz

( ͡~ ͜ʖ ͡° )
Last edited by 1/2A Nut; Oct 27, 2021 at 11:14 PM.
Nov 29, 2021, 08:27 PM
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APC 4x3.3E drone props came in the mail they are strong enough for
.020 and sport .049's.

Lower weight and thin airfoil will help the .020 to spin them well.
Back cut is needed to take some load off the .020.
3.6 x 3.3N will make for good speed and 4x3.3NN for best thrust.

Back cut with a .049 reed should scream it up as a 4x3.3N
The prop as is well do well. The APC 4.5x3.5 was recommended
to be flown with a reed for some solid performance.

Quickie 100 RC flight video with COX 049 engine (7 min 39 sec)


András Balogh
Quickie 100 racer RC plane powered by a 1974 red postage
back plate COX 049 engine, with turbo plug, APC 4.5x3.5
9.8 oz, and add the weight of about 40ml of fuel
Best level pass hit 87 mph prop pitch speed.




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