Dear Paul,

I have been reading many of the articles on your website, they are very informative.  I have been looking for a good engine for a heavy duty gyroplane, and I was told a Subaru EJ25 is a good choice. However, I have not been convinced.  I would think the 13B would be a much better choice.  I owned a RX7 for many years, and when I sold it after an accident it had well over 150,000 miles and the engine was in perfect shape.

I have a couple of questions and hope you can help me out.  First of all, do they make brand new rotary engines?  If not then we can only buy old cars for the engines which is not easy to do in my country as cars must be destroyed after 10 years.  Second, how does the power to weight ratio of the rotary compare with that of the EJ25? The data I got just got me very confused.  The power for the EJ25 ranges from 165hp to 300 hp.  This sounds rather strange, and with such power range the EJ25 could have rather high power to weight ratios too.

Best regards,

Gordon Gao

Soobs have a weak spot in heavy duty use. The head bolt threads fatigue in the aluminum block
and then you have head gasket problems.
Kind of common in piston engines with aluminum blocks. Seems like every GM North-star engine
has failed. Same thing happened to my Honda Odyssey. That is with only 40 HP average. Imagine what it
would be with 150 HP continuous as found in aircraft engines.

I have owned six Mazda  rotaries since 1973 and several went over 300,000 miles.


Paul Lamar

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