2si 690-70 [Archive] - Rotary Wing Forum

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MattPearson

11-07-2003, 01:17 PM

This is just a report on my engine. I am VERY happy with the engine so far. I can cruise in my Super Fly at 75 mph @ 5200 RPM with a 4 gph fuel burn. It is silky smooth and sounds great. Max engine speed is 6500 RPM. I have a 62 inch three blade Warp drive set to 15 degrees.  I have a 2.65 gear box. My prop setting alone is a testament to the incredible torque this engine produces down low and therefore the increased reliability due to lower engine RPM.  We don't need no stinkin four strokes! ;D

ToddP

11-07-2003, 11:41 PM

I flew with a guy in a trike that had the 2si 690-70.  It realy seemed to run well and he was very happy with it.  He did say he needed to change to a 4 bladed prop because the 3 blade w/ the 3 cylinders was causing a resonance.  The prices are much better than rotax.  If I decide I need more power in the future, the 2si will definately be one of my choices.

rfonseca

11-08-2003, 12:05 AM

Do you know the 2si website? Ramón

ToddP

11-08-2003, 01:46 AM

The address to 2si international is: http://www.2si.com/ The link to the information on the 690-70 is: http://www.2si.com/690l-70_690al-70_spec.htm Olenik Aviaton carries this engine. The 690-70 w/ Gearbox & electric start is $4194 Compared to the Rotax 582 w/ Gearbox & electric start @ $6239 Sounds pretty good.

rfonseca

11-08-2003, 01:08 PM

Tks, Todd. They do not mention aircraft nor gyros in the application's section. Ramón

ToddP

11-08-2003, 02:25 PM

It is listed under Industrial Engines.