GaryBarry

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I posted somewhere else but may have more success here;
I am currently scratchbuilding a yak 3, about 1:6 scale, 1.38m wingspan, all up weight approx 2.0kg. The model is made almost entirely from foam, although i hope for much higher scale fidelity than the typical foamy. I plan to fly the plane on about 600 to 700 watts. My question;

What would anyone suggest for cooling the esc, motor and battery in way which does the least damage to the scale profile of the plan? Although I wont enter any topgun compos I would like to build it as well as I can. The problem with the yak 3 is that the cooling ducts are all on the wings (underbelly and wingroots) which has to be removable so how could one duct this back to the esc? For outlet I would use the exhaust stacks. Is there a limit to how much of a reverse bend one can put in a pipe before airflow is restricted? I would appreciate advice from anyone else who has had a similar issue with cooling.

vik

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Hi Gary

JohnR is using holes in the back plate with small pieces of balsa to direct air in to the motor/ESC. This was used on his BT Spitfire along with other models around 80¨ wing span.
Or simply make small duct intake in the nose and exit behind the wing in the radiator area (shall be 2-3 times the size of the inlet).

Good luck
Vik

GaryBarry

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Thanks; I think you are right I will just have to make a small hole in the front and us the exhausts + under wing radiator as air exit; much simpler that way than trying to redirect air from the wing, to the motor then back to the wing.

GaryBarry

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hang on let me see if i read you correctly: do you mean holes in the spinner backplate? If so and feasible that is a very elegant and simple solution