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

Mazda stopped production this year  but they do that from time to time as the market is currently saturated.
They did that in 1995 but started up again in 2004. There have been 2.5 million  sold world wide so there is no
shortage of engines.

The rotary is in no way comparable to a piston engine. There are no stresses in the rotary that lead to metal fatigue
unlike a piston engine. A 300 HP Subaru is a hand grenade. If you are not killed by the shrapnel in the explosion the
resultant crash will do it. :)

http://www.rotaryeng.net/What-is-a-rotary-engine4.html

http://www.youtube.com/watch?v=QOwb8QRHrMY


Paul Lamar


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