We have measured our mono-wheel XS with 912S several times. The first was
with a two bladed Whirlwind prop with the engine at idle throttle, prop full
fine. We got about 11:1 at about 65 knots best glide.
We later tested glide with the Airmaster prop, getting about 11:1 with the
engine at idle with the prop full coarse, again with a best glide of about 65
kts. With the engine off and the prop feathered, we got a glide ratio of about
13:1, with the best glide much higher than before, up around 85 kts.
These were all with a short wing XS, mono-wheel, with the factory speed
kit. We cruise 140 kts at 5.3 gph, and the plane flies hands off with equal
weight in both seats, so I don't believe we have a particularly dirty
airframe.
These numbers are lower than the 16:1 numbers I heard claimed. I have
heard from at least one other XS builder who has measured the glide ratio on
his XS, who got very similar numbers (i.e. around 10.5 - 11:1).
regards,
Terry Seaver
N135TD
irampil@notes.cc.sunysb.edu wrote:
>
>
> I have recently purchased the new Garmin 3600 that works using an
> integrated Palm PDA. It appears to be an excellent EFIS/GPS inexpensive
> color system. I am needing the glide ratio so the 3600 can determine if I
> am within gliding range of an airport. My plane is a trike XS.
>
> This is going to be somewhat different for every builder depending on
> finish, speed kit, prop type, feathering.
> You'll have to measure your own. With a speed kit and feathering prop, I
> believe 20:1 should be within reason.
> I have not measured mine yet. Has anyone some personal data?
>
> Ira N224XS
>
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