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Post  jmcalata Wed Dec 11, 2019 4:38 pm

Hello Small Cox Logo comunity, a little before having the new photo of December, I want to share this curious throttle system for my favorite little cox Pee Wee that combines air restriction and exhaust at the same time.

Pee Wee .020 throttled combinated system Img_2017
Pee Wee .020 throttled combinated system Img_2015
Pee Wee .020 throttled combinated system Img_2014
Pee Wee .020 throttled combinated system Img_2013
Pee Wee .020 throttled combinated system Img_2016
Pee Wee .020 throttled combinated system P1040412

This is a good miniature job of an unknown English craftsman, incorporating nylon bushes, seeger whasers, smooth operation, the wire rods are designed to open one exhaust port first and then another, and needle valve is strange design, I don´t know certainly how is work but when open needle fuel mix come lean and increase speed. Shocked  affraid

I have disassembled some parts but I fear damaging it and I don't have much time now.

Pee Wee .020 throttled combinated system Parts10


Here the rare needle valve, which has two holes, one axial and one transversal, which is covered by the rubber gaskets

Pee Wee .020 throttled combinated system 20191112

Pee Wee .020 throttled combinated system Need10
Pee Wee .020 throttled combinated system 20191111

Finally the system in operation, with an incredible idle  Shocked  and very fast response  Laughing  to the throttle despite having used a very large 5x3 "propeller and a very long tank line.  Huh...

Pee Wee .020 throttled combinated system 20191113
Pee Wee .020 throttled combinated system P1070410

Ready, let´s take off  Flying

Pee Wee .020 throttled combinated system Instan12
Pee Wee .020 throttled combinated system Instan11

You can see Pee Wee spitting fuel  Beer Cheers

Pee Wee .020 throttled combinated system Instan10

I hope you like them and ask all the comments and questions are welcome



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Post  ticomareado Thu Dec 12, 2019 6:51 am

I sure looks like some Limey rig. Sort of like twin Stombergs on an old Volvo or British sports car or maybe some Triumph/BSA motorcycle. The prop in the video looks a bit on the large side.
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Post  1/2A Nut Thu Dec 12, 2019 12:56 pm

Tons of fiddling to get it to run with the larger prop load, yellow safety tipped 4.5x4 made
for the .049. The advantage is a lower idle but does not make much power / rpm.
Would be interesting to see what it does with a .020 prop such as a Cox 4.5D x 2P or APC 4.2x2

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Post  jmcalata Thu Dec 12, 2019 2:26 pm

I will run 4,5x2" prop later Huh... , but big prop is easystarter for first test. Wink
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Post  MauricioB Thu Dec 12, 2019 8:57 pm

do not doubt that there is a lot of design work, that is amazing, now .... is really effective in relation to the weight and power of the engine? ....when it works .... thanks for your tiempo José! Thumbs Up
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