ORIGINAL: NJRCFLYER2
The timing must be very different as the DLE makes about 1/2hp more on stock exhaust than the Syssa on it's exhaust sans inserts.
To make a useful comparison, please run a DLE with representative propellors and post the results. MFGs HP claims are meaningless.
I'm not going by manufacturers claims but by rpm levels with the same Vess 18X6 prop. The Dle 30 (new engine) spins one at 9000 and the Syssa is reported to spin one between 8100 w/inserts
http://www.rcuniverse.com/forum/m_88...48/key_/tm.htm (Post #1184),
http://www.rcuniverse.com/forum/m_88...40/key_/tm.htm (post #978) and 8400
http://www.rcuniverse.com/forum/m_88...39/key_/tm.htm without inserts (Post #964).
I was being kind saying the DLE is only 1/2hp stronger.