Rotomotion
Heliman
Location: Charleston, SC
| engine comparisonsI wish someone owned a small dyno device for testing our helicopter engines. I agree that manufacturer ratings are useless. It seems that someone (magazine, website) should do a engine-by-engine comparison of torque curves, hp curves, fuel consump, responses, etc. for real analysis.
I think it's also important to consider the value of smoothness, response, and needle setting (consistency and holding). These are attributes no mfg measures and can only really be understood through using a motor, or talking to someone you trust to inform you correctly.
The IMZ engine looks great. Everything I know about 2cycle (helis and motorcycles) tells me that this is the setup (w/muffler) for strong flat torque curves. But then, I have only been running one head speed lately, so that wouldn't be of great value to me at the moment (I'll probably go to multi-RPM flying again after I get out of this phase!!!) I fly an OS50 on a pipe now, and it's too much (and the torque is, or course, peaky) for my 600mm blades.... So, when I get an airframe that will take 620+ maybe I could rationalize the IMZ engine.
Hover on,
Dennis |
