You gave a pretty good list of parameters so I think I can make a pretty good guess, especially since you used the same TB throat size as I did. (side note: I think the "bigger is better" approach is the wrong way to go. There is another rotary advocate recommending a 4 inch or larger TB. ) I'm going from memory here but it seems that at cruise altitude I'm using about 2/3 travel on throttle quadrant (econo cruise). Down at sea level this same setting is a lot more power. As you pointed out, there is no single answer but if the throttle were 40 - 50% open, you could fly most anywhere safely and comfortably. I'll look at this more closely next time I fly tomorrow. Tracy (Getting very psyched about trying out several mods to the plane) ----- Original Message ----- From: Al Gietzen Sent: Saturday, April 03, 2004 12:07 PM To: Rotary motors in aircraft Subject: [FlyRotary] Percent Power, Throttle position I'm about to make a new throttle plate control arm, and rig the spring for a default position somewhere between full open and full closed in the event of a throttle disconnect. So the speculative question of the day is - what percent power would one like to maintain in the event of a loss of throttle control, and what butterfly position would roughly give that power? Of course there is no one answer fits all - different airplane, different engine, different TB, even different pilot. But let's just guess for a slippery airplane like a Velocity, with a 265hp NA 20B, and for a TB throat dia of about 1-3/4" for each rotor. Too ambiguous? Then I guess I'll have to wait until I fly to figure it out. Al
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