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Started following this thread. Very interesting. I'd like to put slotted flaps on our BH but haven't figured out how to have a hinge by the cargo door.
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That sounds like a detail I would have discovered right after I installed slotted flaps.Comment
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Regarding AoA flap bias, for simplicity sake, in GA, just set it to stall with flaps full, which will be a lower AoA than with flaps retracted. If you approach the calibrated critical angle of attack while clean, you'll then have a healthy buffer before an actual stall.Originally posted by kestrel View Post
The only thing with the fowlers is you'll have a very large difference in the critical angle of attack vs a plain or slotted. Where it's 2-4 degrees for the latter, the former looks like it could be 5-7 degrees according to the graph from the naval aviators book. 7 degrees is massive(considering an aircraft usually has a longitudinal flight envelope of 0ish to 15ish degrees AoA), and might result in stall warnings at rather high airspeeds. Might be worth contacting the manufacturer of your AoA system to see if flap bias is programmable.... if you have fowlers.Last edited by zkelley2; 09-21-2019, 05:44 PM.Comment
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The plane should be finished and delivered in a week from today. Then they'll be doing paint and probably flying within another week.Originally posted by Shopperly View Post
98.5" of double slotted fowler flaps. I can hardly wait to hear the reports.Comment
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Where is the airplane? In Alaska? Oregon?Originally posted by Battson View Post
This is an A model or a B model?
Does the pilot know how to fly slow well enough to properly evaluate?
VERY interested in this!Comment
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The Bearhawk being modified is an A model based in Utah. The owner is a retired airline pilot who is very good with the plane. He will give a report that we will learn from. MarkComment
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Is he installing a true Fowler that actually moves aft or the STOL Performance flap from Airframes Alaska?
Mark or Jono, If you thinks it’s appropriate I’d appreciate the owners contact info. I’d sure love to go see this plane and get a ride when it’s done. He’s likely only an hour or two flight from me.Scratch Built 4-place Bearhawk. Continental IO-360, 88" C203 McCauley prop.Comment
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Whee, let the guy fly first and evaluate what he is having done to his BH. After that if he is willing - no problem. MarkComment
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Is there an update on this very interesting project?Originally posted by Mark Goldberg View PostComment
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Mark - do you know whether the builder is prepared to share any of his experiences yet with these Airframes flaps?Comment
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I have seen the flaps installed and functioning.
They look great and function well with the Bearhawk drive modification, to convert the Bearhawk flap handle through to a cub throw.
He has indicated they just bolted straight on, and were easily installed. Of course there are some simple wing skin modifications around the flap pocket too.
One opportunity missed, the modifications to the wing pocket have not created the 'ideal' pocket for the first stage of the flaps. The first stage will probably be un-blown. Though this could be improved at a later stage.
The aircraft is not flight-ready yet. All builders will understand this, 90% finished and 90% still to be done.
It will be interesting to see how they perform.
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Yes that is a Bearhawk 4-place, and those flaps are 98.5" long.... They increase the wing area by several square feet when extended, not to mention the camber!!Last edited by Battson; 11-21-2019, 09:46 PM.Comment
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I assume (hope?) that we will learn what the "ideal" pocket for the flaps is? Maybe I'll just plan on building for these off the bat? Looking forward to flight test impressions.https://www.youtube.com/user/fastfox23
Patrol plans #398Comment
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Very interesting. Thanks for posting the pics and information.Comment
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