RV-List Digest Archive

Wed 05/20/15


Total Messages Posted: 2



Today's Message Index:
----------------------
 
     1. 10:08 AM - Best glide speed RV6A ()
     2. 04:20 PM - Re: Best glide speed RV6A (Denis Walsh)
 
 
 


Message 1


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    Time: 10:08:12 AM PST US
    From: <cheathco@cox.net>
    Subject: Best glide speed RV6A
    Interesting article in Flying mag (may) re dead stick landings. I experime nted with determining that quite bit when I first got my 6A, based at LZU at the time. That was in late 04/early 05. I never felt I could absolutly put a number on it, but settled on 75/80 mph, pretty much speed on final. This article got me thinking about it again, but due to very recent rt shou lder surg, I will no be flying for a while. ( think I could manage everythi ng exept flaps but getting in and especially back out may take a while). An yway, would like to hear from 6A drivers what they would use for dead stick air speed? Charlie H --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com


    Message 2


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    Time: 04:20:14 PM PST US
    From: Denis Walsh <denis.walsh@comcast.net>
    Subject: Re: Best glide speed RV6A
    Charlie, I have a 6A, and I agree with your ball park figure; however I would caution there are many variables: prop (cs or fixed), power status (stopped prop or windmill), airplane weight, Idle rpm of your engine, etc. There are probably more. In my case I have an average weight 180hp with c/s prop and low idle speed. I use 80 to 90 knots for glide and across the fence 75K. That leaves a lot of speed to kill in the flare but I have a low idle speed and lots of drag if windmilling. This is what I practice with. It gives a rather steep glide and I am sure it would be quite different with a stopped prop or partial power, but I feel these would make for a better glide which I could deal with. I always practice with the prop in max RPM so I have max drag. One can practice for the zero thrust, min drag glide if you fiddle with the throttle to establish zero thrust, but I consider this to be too tough for me and of minimal value in an emergency which will almost certainly be different than you practiced any way! My opinion is the same about practicing with coarse pitch glides. I don=92t think you can count on having enough oil pressure to go coarse pitch in many engine failure scenarios. So I just practice the worst case, with low pitch low rpm, and glide at 80-90, until the field is made then flare, add drag and land. I figure if my emergency has better glide angle than I have practiced, I can put the flaps down sooner or side slip. Coming up short on final is, on the other hand usually not a good option. I certainly don=92t claim this is the best or the only way to practice, it=92 s just the way I do it, as you asked, based on a lot of practice over the past 18 years and 3100 hours in the 6A. You would have thought i would have worn it out by now but it is still going strong.. I hope your shoulder heals soon. Denis Walsh denis.walsh@comcast.net > On 20May, 2015, at 11:07, <cheathco@cox.net> <cheathco@cox.net> wrote: > > Interesting article in Flying mag (may) re dead stick landings. I experimented with determining that quite bit when I first got my 6A, based at LZU at the time. That was in late 04/early 05. I never felt I could absolutly put a number on it, but settled on 75/80 mph, pretty much speed on final. This article got me thinking about it again, but due to very recent rt shoulder surg, I will no be flying for a while. ( think I could manage everything exept flaps but getting in and especially back out may take a while). Anyway, would like to hear from 6A drivers what they would use for dead stick air speed? Charlie H > > > <http://www.avast.com/> > This email has been checked for viruses by Avast antivirus software. > www.avast.com <http://www.avast.com/> > > <http://www.matronics.com/Navigator?RV-List> <http://www.matronics.com/contribution> >




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