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d(at)cfisher.com
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 Posted: Sun Mar 18, 2007 9:32 am Post subject: Droop tips -Crusie speeds mods. |
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Well seeing that everyone is quick to post facts today , I have been asking if anyone has actually changed from a Droop style tip to a newer hoerner style tip with no success. Can I conclude that this has just been for aesthetic only.?
I have mixed feelings at they both have there pros and cons.
Surely with all the years of expertise here we can come to a conclusion.
If is possible for a 582 Kitfox to cruise at 100 mph ? I am at 102 to 104 now WOT at low altitude (1500 asl) and 88 to 90 at cruise setting on wheels.
Not sure what more can be done to get another 10% . Original Kitfox info I think say cruise at 7500 asl is 105 mph. 582 just seems to hit a brick wall and/or run out of torque.
Would be productive for all Kitfox Owners to be able to pick up a few extra mph ?
Dave
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Sun Mar 18, 2007 10:43 am Post subject: Droop tips -Crusie speeds mods. |
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No doubt the Hoerner tips would increase speed marginally. So would strut fairings and gas cap fairings. Wheel pants would help too and while we are at it give the windshield more rake. then you will want the heaviest two blade prop your PSRU can swing. With all this I still doubt you will hit a cruise of 100+mph.
I certainly don't think my B box swinging that little Ivo will come any where near 100 even if I were to take the floats off.
I think the droops may give a bit better flight characteristics in ground effect. That makes them desirable for me.
Noel [quote]
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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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lcfitt(at)sbcglobal.net
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| Posted: Mon Mar 19, 2007 8:28 am Post subject: Droop tips -Crusie speeds mods. |
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Dave,
I have an opinion here, that was brought into question by a recent
conversation. It has been my belief that one of the major drag contributors
to the Model IV and earlier airplanes is using the flaperons for trim.
Flaps are by design drag inducers and if you have to pull a bit of flaps to
drop the nose a bit in cruise you are adding at least some drag. I have the
elevator trim in my IV and intend to fly today. I will try it both ways.
Lowell
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kitfoxmike
Joined: 05 Dec 2006
Posts: 373
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| Posted: Mon Mar 19, 2007 1:53 pm Post subject: Re: Droop tips -Crusie speeds mods. |
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couple things here: first speeds of 100 mph, is that with a gps or indicated?
second, flaps, I don't use them, I think there a waist. But, I would be interested in the best possision for the flaps for the least drag. I've also tried to get the top speed and had the flaps adjusted within two inches from where I think is neutral and had no effect on speed.
Just a side note on landing without flaps, today I landed with calm winds and from touch down to stop was right around 200ft. I have this way of doing it that I slow to 50 over the numbers and just as I flair I put in a little throttle and the nose flairs up and then I hold that and pull the throttle off slowly and let the airplane land, by that time the fox is moving very slow and after touch I hit the brakes lightly and stop it, very short. forget the flaps.
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