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  #31  
Old 10-17-2016, 07:20 AM
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Default new sparrowhawk mod.

After some thought and a little courage, I decided to build a simple keel extension and change the tail feathers from the tall tail to the RAF vertical stab with the Boyer horizontal stab. I test flew it 2 days ago and it was a major improvement in stability over the tall tail. I missed my modified RAF with the drop keel. I THINK I AM IN LOVE AGAIN.
Sorry about the one photo. I tried correcting it, but to no success.
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Last edited by LARRYEBOYER; 10-17-2016 at 07:35 AM.
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  #32  
Old 10-17-2016, 08:14 AM
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Default Good Job Larry!

Good job working that out Larry and thank you for sharing your solution.

I felt the Groen Brothers modified RAFs I have flown flew pretty well and I did not encounter anything I felt was squirrely.

They seemed very sensitive to rudder cable adjustment.
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  #33  
Old 10-17-2016, 01:22 PM
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see if this works
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  #34  
Old 10-17-2016, 06:09 PM
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Thank you.
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  #35  
Old 10-17-2016, 06:14 PM
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Can the rotor touch the tail with the stick full aft?
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  #36  
Old 10-18-2016, 07:31 AM
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Paul. That was a major concern when I built the additional keel. The rotor is not even close, or I would have moved the tail feathers closer to the cabin. Good question. Gregg Greminger has been a proponent of "Way back" for the stab position.He was the inspiration for this attempt to get more stability. I flew last night. Winds were apx 6-10 mph.Rarely a bump. I am going to continually increase the speedin higher f winds during this test Phase.The last RAF with the Boyer mod had 10 inches added to the keel length and the gyro flew amazing.
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Last edited by LARRYEBOYER; 10-27-2016 at 11:00 AM.
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  #37  
Old 10-18-2016, 10:32 AM
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Larry- Looks nice! My two complaints about my SparrowHawk was the wig way it had and the excessive back stick force needed with the power off.
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  #38  
Old 10-27-2016, 10:57 AM
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I did not experience the tail wiggle or the heavy stick at idle. I just thought it seemed to have lost that solid stability feeling when I was in wind. May be I was spoiled with the RAF Boyer warrior. This newtail group seems to have brought back that solid stability feeling, but I have not been in winds above 10 mph on the ground.
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  #39  
Old 10-27-2016, 11:05 AM
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Stan how are you? Hope all is well. I did not experience the tail wiggle or the heavy stick at idle. My ship seemed to have lost some stability and I didn't feel relaxed when I flew it. The new tail feathers seem to have returned the stability I enjoyed with the RAF Boyer Warrior. Still I will know better when I fly in higher winds.
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  #40  
Old 11-23-2016, 05:00 PM
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Where I placed the stabs, I still feel some shakey feeling. My theory is like riding behind a truck and trailer. At the right spot you get the turbulence. That could be what's causing that feeling. I moved the stabs forward 10 inches. Not only looks better,but now this machine is where I want it. I tuned the RAF blades today. Now stick is smooth and cabin hop is gone. Track was off and rotors needed centered in the towers.
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