Sonnich,


That is a big plane.

The MVVS .49 is at its best when equipped with the #3248 tuned silencer.

When using the #3245 silencer it is a standard .46-.50 sport engine, as far as power is concerned.
Its timing and compression are designed to utilize the most the tuned exhaust system can give it.

The experience I personally have with this engine with the normal silencer, is on a 67" (1.70 m) span, high wing aircraft.
With the tuned silencer, I had it on a 58" span low wing model.

Both weigh 2.5-2.7 kg.

Several other such engines, most with the tuned silencer, are flying on light, aerobatic and 3-D planes.

Your estimate of 7 kg seems scary.

I now have a 1.92 m plane, that I am powering with a 26 cc MVVS glow, with the MVVS tuned pipe. It only weighs about 4.5-5 kg.


If your intentions are to fly this P-38 in a scale manner, not expecting it to pull up too steeply, it would fly with the standard silencer and will need a considerable runway length to take-off. The tuned silencers will give it a respectable boost.

With the #3245A silencer, as we talked in previous threads (and see in one of the photos), it will suffer from a power shortage, with this much weight to haul; to the point of being under-powered.