Hi David,
According to my calculations, you dropped 2200 feet (3400-1200) and traveled
21,326 feet (6.5 km x 3281 ft/km), giving a glide ratio of 9.7 to 1. We measured
between 10.5 and 11 to 1, which is very close. Also, we noticed that the best
glide speed with prop turning at idle was lower than 75 kts (we use 65 kts for
best glide when not feathering the prop). With prop stopped and feathered, we
get 13 to 1 glide at higher speeds, around 80kts best glide speed.
regards,
Terry Seaver
A135 / N135TD
David Watts wrote:
>
> Sorry to be a couple of days late responding to this one but we have been
> touring round Scotland for 3 days. We were in out house at 10 am in Kent and
> then in Dundee, Scotland at 3pm, having stopped halfway for lunch and a
> leak. What a way to travel.
>
> But back to glide ratios. I have tested this twice in the last month, once
> solo and the second time two up and full fuel. Interestingly the results
> were identical (which apparently backs up the theory).
> Both occasions were evenings and very calm with the small wind component at
> 90 degrees, and the start and finish at the same point. I started at 3,400
> ft (TMA limits us to 3500) and set course for our home field at 75 knots and
> with the motor obviously on tickover. The GPS said we had 6.5 km to go. I
> arrived at our base on both occasions at 1,200 ft. This works out to 18:1 if
> my maths are correct.
>
> Dave Watts 229 G-BXDY 910 hours and still having a ball.
>
> > 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.
> >
> > Thanks,
> > Chuck Rhoads A100
> > 246CR
>
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