Originally posted by kestrel
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Stolspeed VG's
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Not sure as mine were on when I baught it. Their a rubber “H†and fit really nice. I’ve been trying to find them online but no luck yet. Cubcrafters gap seals are way to wide to work on the A model Bearhawk. I really like what the Horiz stab VG’s did for my 4-place but you couldn’t pay me enough to put them back on my patrol
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I was looking at these a while ago at Aircraft spruce https://www.aircraftspruce.com/catal...ickkey=3018758
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Originally posted by Battson View Post
Kestrel, Isilverone - which gap seal are you using?
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Question for those with 4-place BHs: What are you feeling that makes you like VGs and/or gas seals on the tail?
I put a profiled tail on my BH and can’t think a reason to change anything. I’ve very curious what I’m missing.Scratch Built 4-place Bearhawk. Continental IO-360, 88" C203 McCauley prop.
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Originally posted by whee View PostQuestion for those with 4-place BHs: What are you feeling that makes you like VGs and/or gas seals on the tail?
I put a profiled tail on my BH and can’t think a reason to change anything. I’ve very curious what I’m missing.
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Originally posted by Battson View PostWith the profiled tail fitted on a 4-place, flying near empty weight, you should still run out of control authority at the flare with the throttle closed.
Otherwise you are landing too fastScratch Built 4-place Bearhawk. Continental IO-360, 88" C203 McCauley prop.
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Originally posted by Battson View PostWith the profiled tail fitted on a 4-place, flying near empty weight, you should still run out of control authority at the flare with the throttle closed.
Otherwise you are landing too fast
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I recently installed Stolspeed VG's on my A model 4-place wing only, w/ profiled hor stab & gap seals. Preliminary tests show 3 mph reduction in stall with clean, but gentle break w/o buffet. No reduction in cruise speed @ 50 percent power. Installed with highest part of VG in line with 4th row of rivets. Will keep them.
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For anyone who worries about the wing stalling all at once with VGs I did have that in a few application where the stall speed dropped noticeably but the stall became more abrupt.
The fix is to either move the VGs inboard of the Aileron back 1-2 inches in comparison to the outboard VGs Or a nice very smooth stall is generated by having the outboard section swoop forward.
I found 1" sweep forward from mid wing to the tip to be sufficient in most cases to give a very smooth approach into the stall with the tips flying well into the stall with very good feel to the aileron
throughout slow flight and right to the end. Properly set up VGs are a great enhancement to control and safety right in the most critical phase of flight ,
never mind the slower landing and take off speeds that is just a side benefit. I wish more people would recognize and see them for that instead of a stol mod.
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Same spacing between VG's but More forward on the outboard section a little may go a long way. Some wings do not need a set back at all.
You can just use double sided carpet tape to try out the swept or set forward designs base on what you prefer or try different settings..
I prefer the paired spacing much like the Mircro VG set up on cubs.
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Yesterday I installed Stolspeed VG's on my 4-place B model and spent an hour or so repeating stalls both power on and power off.
In a nutshell (and at first glimpse) at 2200 lbs the power off stall speed has dropped about 5 kts for all flap settings. Power on stalls didn't show much change in the stall speed, but at this early stage I didn't see any wing drops. I was able to fly at around 45kts in level flight at 3000ft in full control. When the wing stalled with F3 or F4 the descent rate increased but the wings remained level.
I've got alot more to do in this area, this was just a first look.
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This gallery has 1 photos.Last edited by Nev; 12-26-2021, 08:51 PM.Nev Bailey
Christchurch, NZ
BearhawkBlog.com - Safety & Maintenance Notes
YouTube - Build and flying channel
Builders Log - We build planes
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I’m really interested in where folks determine the best location for the VGs is. The figures I’ve heard range from 2.5% of chord to about 12%. Stolspeed I believe were recommending 7% but have revised that to 5%. Because my experience of VGs on wings is limited to a C210 and C172 which are covered by an STC that positions them at 2.5% I’ve gone for a forward position. I’m hoping my next engine lasts more than 18 hours so I can do some meaningful testing and report back but very interested to hear of others experience with a B model wing.
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