The Murphy Builders Site

Ok, what is the best way to get parts these days? Bob P?

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----- Reply message -----
From: "Wayne G. O'Shea" <oifa@irishfield.on.ca>
To: <rebel-builders@dcsol.com>
Subject: [rebel-builders] Bent gear leg
Date: Mon, Aug 15, 2011 10:27 am


Replace! (Sorry) ! ;O)

----- Original Message -----
From: <jessejenks@hotmail.com>
To: <rebel-builders@dcsol.com>
Sent: Monday, August 15, 2011 12:09 PM
Subject: [rebel-builders] Bent gear leg

I had a hard landing which bent a gear leg (bungee style with die
springs).
I have been landing at some pretty challenging spots in the Idaho
backcountry while feeling out the short/rough capabilities of the Rebel.
Well I guess I found the edge of the envelope: I put her down on a 700'
rough rocky strip with trees, at 4,000' elevation. I knew I had to plant
it
right on the end, and plant it I did. I was already aware of the tendency
of that wing to maintain its rate of decent in the flare regardless of
increasing aoa. I knew I would need to add power to arrest the descent,
but
I guess the shortness of the strip influenced my reflexes. Anyway, I hit
pretty hard. I looked it over really good, and then went fishing. Only
after really getting down on the ground and looking carefully, a week
later, did I notice a bent gear leg.
Has anyone had success with trying to straighten one, or will I need to
replace it? I was thinking I could put it in a press with some blocks of
wood and tweak it back into shape. Seems like it will be a pain to
replace..will have to basically take the whole gear assembly apart.
Anyway, I will probably keep flying for the rest of the summer. Some 29"
bushwheels will be on my shopping list if I'm going to do any more strips
like that, and VGs. Will VGs help with the "falling out of the sky"
characteristic? Doesn't seem like the best stol airfoil, maybe that's why
Angus came up with the LE cuff. As someone said ...sto...but not L. Seems
like it needs more flap too. If you look a Twin Otter which I think has
the same airfoil, it has a ton of flap. It still falls out from under you
if you're not carefull though. I have often wondered why Dehav. used that
airfoil, and I guess it can be used to a pilots advantage in precise
touchdown control with no float, but with a plane like the twotter you
can
flare it a lot more....and the gear is really, really tough....I know.




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I may take you up on that Ben. Thanks for the offer. I don't have VGs yet, but was hoping like you that they would allow more lift during the flare. It sounds like that isn't the case though. I am finding that the airplane is controllable to a pretty slow touchdown speed, but unfortunately the only way to stop the descent is with power. I wish the gear was about a foot taller, then maybe you could use all the lift the wing is capable of producing. Actually if I can figure out how to beef up the rear attach points I may build taller gear. Maybe Wayne can modify my die spring struts...and add a second spring.

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----- Reply message -----
From: "Ben Ransom"<bransom@ucdavis.edu>
To: "rebel-builders@dcsol.com"<rebel-builders@dcsol.com>
Subject: [rebel-builders] Bent gear leg
Date: Mon, Aug 15, 2011 2:20 pm


Hey Jesse,
I found the main gear leg material a couple years ago, with the only
downside that I had to buy a 16ft (or maybe it was 20) stick. I still
have most of it left of course. Happy to cut and ship to you at cost.

IIRC, this is the 1.25" square with rounded corners, I forget wall
thickness, but I know it's exact match to MAM. I also have the smaller
square stuff used above the bow-tie.

BTW, Are you using VGs? My hope is that they soften that last drop in
phase.
-Ben


On 8/15/11 9:09 AM, "jessejenks@hotmail.com"<jessejenks@hotmail.com>
wrote:

I had a hard landing which bent a gear leg (bungee style with die
springs). I have been landing at some pretty challenging spots in the
Idaho backcountry while feeling out the short/rough capabilities of the
Rebel. Well I guess I found the edge of the envelope: I put her down on a
700' rough rocky strip with trees, at 4,000' elevation. I knew I had to
plant it right on the end, and plant it I did. I was already aware of the
tendency of that wing to maintain its rate of decent in the flare
regardless of increasing aoa. I knew I would need to add power to arrest
the descent, but I guess the shortness of the strip influenced my
reflexes. Anyway, I hit pretty hard. I looked it over really good, and
then went fishing. Only after really getting down on the ground and
looking carefully, a week later, did I notice a bent gear leg.
Has anyone had success with trying to straighten one, or will I need to
replace it? I was thinking I could put it in a press with some blocks of
wood and tweak it back into shape. Seems like it will be a pain to
replace..will have to basically take the whole gear assembly apart.
Anyway, I will probably keep flying for the rest of the summer. Some 29"
bushwheels will be on my shopping list if I'm going to do any more strips
like that, and VGs. Will VGs help with the "falling out of the sky"
characteristic? Doesn't seem like the best stol airfoil, maybe that's why
Angus came up with the LE cuff. As someone said ...sto...but not L. Seems
like it needs more flap too. If you look a Twin Otter which I think has
the same airfoil, it has a ton of flap. It still falls out from under you
if you're not carefull though. I have often wondered why Dehav. used that
airfoil, and I guess it can be used to a pilots advantage in precise
touchdown control with no float, but with a plane like the twotter you
can flare it a lot more....and the gear is really, really tough....I know.




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