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rayw
Joined: 18 Jul 2009
Posts: 25
Location: Wisconsin, Central
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 Posted: Fri May 28, 2010 9:15 am Post subject: Dihedral |
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Hello and happy memorial weekend to all.
To all the vets....Thank you brothers!!
Question: I have a MKII and need to know where the Dihedral should be in degree's. I would like to hear any answer for any Kolb model. MKIII, Firestar, etc. Right now I measure 1 degree per wing so 2 degree's combined. Seem's like kind of a small amount to me. Please comment. Any and all are welcome.
Ray W.
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JetPilot
Joined: 10 Jan 2006
Posts: 1246
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| Posted: Fri May 28, 2010 11:05 am Post subject: Re: Dihedral |
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Ray,
My uncle Dave increased the amount of dihedral in his firestar to give it more stability and also more Rudder - Yaw coupling and liked it. I have a little more dihedral than called for in my MK III Xtra and like the way it flys. The standard amount of dihedral results in less natural stability, its a matter of how you like your plane to fly.
Mike
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_________________
"NO FEAR" - If you have no fear you did not go as fast as you could have !!!
Kolb MK-III Xtra, 912-S |
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vincenic1(at)embarqmail.c
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| Posted: Fri May 28, 2010 11:34 am Post subject: Dihedral |
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Ray,
Richard Pike and I have both put dihedral into Firestar II airplanes and have discussed this in the archives. Please search the KOLB list with the search term dihedral. The descriptions listed below were posted in Aug 1998. Please feel free to ask any additional questions you like. I have about 500 hours on my Firestar II with most flown with significant dihedral as described in the notes. I like it with significant dihedral.
The numbers refer to the number of the item in the Kolb list of a few years ago (may be the same now, but I haven't checked).
#6349 - Primary description of results
#6350 - Comment on cross wind capability
#6392 - Comment on pitch control with spring trim for flying hands-off
#27789 -
#45421 - additional recent comments by Richard Pike
Vince Nicely
On 5/28/2010 1:15 PM, rayw wrote: [quote] | Quote: | --> Kolb-List message posted by: "rayw" <rmwis(at)wi-net.com> (rmwis(at)wi-net.com)
Hello and happy memorial weekend to all.
To all the vets....Thank you brothers!!
Question: I have a MKII and need to know where the Dihedral should be in degree's. I would like to hear any answer for any Kolb model. MKIII, Firestar, etc. Right now I measure 1 degree per wing so 2 degree's combined. Seem's like kind of a small amount to me. Please comment. Any and all are welcome.
Ray W.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=299163#299163
Checked by AVG - www.avg.com
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[b]
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by0ung(at)brigham.net
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| Posted: Fri May 28, 2010 4:12 pm Post subject: Dihedral |
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Hello and happy memorial weekend to all.
To all the vets....Thank you brothers!!
Question: I have a MKII and need to know where the Dihedral should be in
degree's. I would like to hear any answer for any Kolb model. MKIII,
Firestar, etc. Right now I measure 1 degree per wing so 2 degree's combined.
Seem's like kind of a small amount to me. Please comment. Any and all are
welcome.
Ray W.
| Quote: | >>>>>>>>>>>>>>>>>>>>>>>>>>
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Ray
If my math is correct... the angle of dihedral per the plans is 0.5968deg
per wing panel.(up from straight) When I built to this standard and put
the mkIII into a 30 deg bank and let go of the stick it wanted to roll into
a steeper bank. I reconfigured the dihedral to 1.1934 deg up from straight
and when retested the bank wanted to stay put. I am not sure but I believe
if I had gone to 1.5 to 1.78 deg per wing the plane would have rolled back
to level flight when the stick was let go at a 30 deg bank.
In real life I rigged the wings straight, and when finishing the center
attach points the first rigging was to raise the outboard rib 1 1/2 inches
from straight. Then set the length of the lift strut. On my second attempt
I raised the outboard rib 3 inches. And wish I had tried 4 to 4 1/2
inches.
I could not tell any flight difference other than the roll stability going
from negative to neutral between the first and second attempt.
Boyd Young
Kolb MKIII
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Fri May 28, 2010 4:24 pm Post subject: Dihedral |
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Couple years ago Homer rebuilt the 1985 FS, Osh Grand Champ UL 1985, which
was crashed and totaled Osh 1989. Nope, I did not do it, but witnessed the
crash.
During rebuild Homer increased dihedral. I think he doubled it.
I flew this same FS in its original configuration, and again after
restoration.
Probably a little more stable, but not much. Hard to tell if there was any
loss of performance because Homer replaced the 377 with a 503. It climbed
like a rocket.
john h
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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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rayw
Joined: 18 Jul 2009
Posts: 25
Location: Wisconsin, Central
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| Posted: Sun May 30, 2010 9:26 am Post subject: Re: Dihedral |
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Thanks to all for the come back on the Dihedral question.
FYI: I went to the new Kolb web-site and found that they list the Dihedral at 0.9 degree's for all the current models. Those folks that wished they had increased dihedral during construction really got my attention. That may very well be a next winter project. I like the idea of letting go of the stick and having the plane come back to neutral.
At least for now I know the dihedral angle is acceptable where it is.
Best regards,
Ray W.
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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