ORIGINAL: MTK
ORIGINAL: DagTheElder
Hi MTK!
Have not had a chance to test the wings we have been discussed, but it will come!
Very interesting the Syssa engine. Is it possible that this engine can perform equally with any pattern engine despite it run on gas and not on alcohol mix. This without tuning it hard with pipes and GP porting etc. It dosent matter if the CC is larger than current Pattern engines if it is light enough to fit within the current weight rules and noise and is equally powerful. The fuel cost here in Norway will be approx 1/5 of alcohol mix.
Best wishes for your testing
Hi,
I just came back from the flying field having test flown the engine. I am very impressed. The plane is an original design that is larger and heavier than the typical pattern models we fly currently. 11# 10 ozs, 1150 square inch wing, full 2X2.
The prop was 18.1x10 std blade; pipe was ESC40G and fuel was regular 87 octane gasoline with 1% synthetic oil (100:1).
Excellent, useful power is available from the engine as is, even with the long exhaust duration. The pipe produces a mellow, pattern like sound. I would put the noise level at around 88 dB. Not at all annoying or harsh as can sometimes happen running high nitro glow.
To me, the engine is a keeper and I am planning to campaign it next year
MattK
Hi MTK!
Just somting that come into my mind re the Syssa eng. testing. Some want to restroke it, but is this the right way to power-up this engine? Ihavent a clue of the innards and porting of this engine so I just speculates if an increase in BMEP (brake mean effective pressure)would be beneficial for the purpose of comparison to an YS 4c???? To make it equal powerful to an YS 170 cdi the Syssas pumping/charging of cylinder must incrase i guess? The problem is that the userfriendlines of the engine may dissaper. The disadvantage of gas engines are that they need a air/fuel ratio of 12-18 : 1 and methanol mix engine may have very low air/fuel mix as little as 4-5-6 something : 1 but then burns methanol mix 2-3 times the volumes of gas.
You were running on 87 octane, this indicates it is a trapped compression 7:1???
Iam looking foreward to follow your testing and results for future use in pattern!
Regards