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PT19 external fuel tank conversion. Babe_b10
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PT19 external fuel tank conversion. Empty

PT19 external fuel tank conversion.

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PT19 external fuel tank conversion. Empty PT19 external fuel tank conversion.

Post  roddie on Sun Aug 26, 2018 6:14 pm

A new thread on an old issue.. My PT19 is among the mid 1990's versions; equipped with a Cox .049 "Product-Engine".. but preceding the Sure-Start engine.

My version of this model, had a Cox .049 reed-valve "Product Engine". In the mid 1990's; a Cox .049 Product engine consisted of (generally) the current Cox .049 reed-valve crankcase.. fitted with the 2nd generation product backplate/carb.. which utilized an external fuel-tank/supply. This was a continued effort by Cox.. to produce a model-engine that could be fitted/retro-fitted into existing/future designs. By this time; Cox likely noticed that there were other modeling-companies (Goldberg for instance..)who were producing adapting-mounts for the earlier 190/290 product engines.. allowing these otherwise "misfit-engines" engines to have a "second-life" in a Goldberg balsa-wood kit-model. Cox eventually "wised-up" and re-engineered their product backplate/carburetor to have mounting-provisions (4 screw-holes) for a standard 1/2-A engine size radial-firewall.

My "first" experience with the Cox PT19 Flight Trainer was "really wonderful".. because my "dad" bought the model.. and brought it to my house as a "surprise" one day. I was in my early "30's". The Cox "kit" had everything needed to get the model in the air.. for a few flights.. at least. I had shown a past interest in his control-line flying.. so my dad "passed the torch".. so to speak.

To move forward... Rolling Eyes I wanted to give a report on what I'm doing, to retro-fit an alternate fuel-tank to this model.

Here's a few photos of a Sullivan #435 1oz. clunk-tank fitted in-between the fuse-walls of the models' nose.

PT19 external fuel tank conversion. 20180823
PT19 external fuel tank conversion. 20180824

I'll admit.. that it's difficult to see how the Sullivan tank integrates into the airframe here.. but when the "wing" is anchored into position; it (the wing..) provides a barrier that should prevent the tank from interfering with the model's bellcrank. In addition; this retro-fitted tanks' position will be "nearer" the models' center of gravity.


Last edited by roddie on Sun Aug 26, 2018 8:03 pm; edited 1 time in total
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Post  Kim on Sun Aug 26, 2018 7:26 pm

Well, I held a 3/8 oz Brodak tank inside the fuse of a PT, and it looks like it'd be easy to mount in there. You'd have a bit more flying time than an 8 cc tank.
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Post  roddie on Wed Aug 29, 2018 1:24 am

I've been "messing" with the Sullivan SS-1 #435 1 oz. clunk-tank.. and it's not going to be an "easy" retrofit. There's plenty of space for a comparable "gravity-feed"/roundy-round fuel-tank, like the one that was designed for this model. I'll come up with something.. I want to fly this airplane for this year's event.
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