cobra trailer style wing beds

Does anyone know how long the wing leading edge trailer beds should be for a std cirrus? I want to replace the pheiffer trailer wing cuffs with cobra style beds to decrease the ground handling gear count and ease the use of a wing rigger.
thanks,
Scott w.
N8915

On Monday, January 30, 2017 at 10:07:22 AM UTC-5, Scott Williams wrote:
Does anyone know how long the wing leading edge trailer beds should be for a std cirrus? I want to replace the pheiffer trailer wing cuffs with cobra style beds to decrease the ground handling gear count and ease the use of a wing rigger.
thanks,
Scott w.
N8915

We made some for a St Cirrus going in a Komet. They were 15 inches long. We made a mold from aluminum and laid up 8 plies of 8 oz cloth. Felt came from McMaster Carr.
When planning this look at the wing dollies and make sure they will go over your saddles. Most likely they will need to be altered.
This can be a very nice improvement, but plan the details.
Good Luck
UH

On Monday, January 30, 2017 at 9:17:20 AM UTC-6, wrote:
On Monday, January 30, 2017 at 10:07:22 AM UTC-5, Scott Williams wrote:
Does anyone know how long the wing leading edge trailer beds should be for a std cirrus? I want to replace the pheiffer trailer wing cuffs with cobra style beds to decrease the ground handling gear count and ease the use of a wing rigger.
thanks,
Scott w.
N8915

We made some for a St Cirrus going in a Komet. They were 15 inches long. We made a mold from aluminum and laid up 8 plies of 8 oz cloth. Felt came from McMaster Carr.
When planning this look at the wing dollies and make sure they will go over your saddles. Most likely they will need to be altered.
This can be a very nice improvement, but plan the details.
Good Luck
UH

Thanks UH,
Good points.
Scott W.

It's often convenient to add a second leading edge pad further towards the rear of the trailer so you can move the wing back far enough to access the cockpit without removing the fuselage.

Also consider draping a microfiber cloth over the pad to avoid wing surface abrasion caused by dirt on the original pad surface - you can wash the cloth now and then.

bumper

On Wednesday, February 1, 2017 at 3:11:44 PM UTC-6, bumper wrote:
It's often convenient to add a second leading edge pad further towards the rear of the trailer so you can move the wing back far enough to access the cockpit without removing the fuselage.

Also consider draping a microfiber cloth over the pad to avoid wing surface abrasion caused by dirt on the original pad surface - you can wash the cloth now and then.

bumper

(2nd pad further towards the rear),
On the span where do the pads usually lie? 3/4 out from root?
Thanks,
Scott W.

Originally Posted by Scott Williams

On Wednesday, February 1, 2017 at 3:11:44 PM UTC-6, bumper wrote:
It's often convenient to add a second leading edge pad further towards the rear of the trailer so you can move the wing back far enough to access the cockpit without removing the fuselage.

Also consider draping a microfiber cloth over the pad to avoid wing surface abrasion caused by dirt on the original pad surface - you can wash the cloth now and then.

bumper

(2nd pad further towards the rear),
On the span where do the pads usually lie? 3/4 out from root?
Thanks,
Scott W.

Hi Scott

My Ventus maintenance manual specifies 2.5m in from the tip for a wing bed although it doesn't specify a length for it. UH's suggestion sounds real good to me for the size of it

Your Cirrus maintenance manual may well have some guidance in the section on storage, transport and rigging.

:-) Colin

The Std Cirrus has tiedown bolt holes that double up to retain the wing
in the trailer dolly.

When you pull the wing back, the dolly is secured to the wing, and rolls
back with it.

There is very little movement because of the positive location.

Bruce

On 2017-02-02 06:52, Ventus_a wrote:
Scott Williams;937104 Wrote:
On Wednesday, February 1, 2017 at 3:11:44 PM UTC-6, bumper wrote:-
It's often convenient to add a second leading edge pad further towards
the rear of the trailer so you can move the wing back far enough to
access the cockpit without removing the fuselage.

Also consider draping a microfiber cloth over the pad to avoid wing
surface abrasion caused by dirt on the original pad surface - you can
wash the cloth now and then.

bumper-

(2nd pad further towards the rear),
On the span where do the pads usually lie? 3/4 out from root?
Thanks,
Scott W.

Hi Scott

My Ventus maintenance manual specifies 2.5m in from the tip for a wing
bed although it doesn't specify a length for it. UH's suggestion sounds
real good to me for the size of it

Your Cirrus maintenance manual may well have some guidance in the
section on storage, transport and rigging.

:-) Colin





--
Bruce Greeff
T59D #1771

On Thursday, February 2, 2017 at 10:36:09 AM UTC-5, BruceGreeff wrote:
The Std Cirrus has tiedown bolt holes that double up to retain the wing
in the trailer dolly.

When you pull the wing back, the dolly is secured to the wing, and rolls
back with it.

There is very little movement because of the positive location.

Bruce

On 2017-02-02 06:52, Ventus_a wrote:
Scott Williams;937104 Wrote:
On Wednesday, February 1, 2017 at 3:11:44 PM UTC-6, bumper wrote:-
It's often convenient to add a second leading edge pad further towards
the rear of the trailer so you can move the wing back far enough to
access the cockpit without removing the fuselage.

Also consider draping a microfiber cloth over the pad to avoid wing
surface abrasion caused by dirt on the original pad surface - you can
wash the cloth now and then.

bumper-

(2nd pad further towards the rear),
On the span where do the pads usually lie? 3/4 out from root?
Thanks,
Scott W.

Hi Scott

My Ventus maintenance manual specifies 2.5m in from the tip for a wing
bed although it doesn't specify a length for it. UH's suggestion sounds
real good to me for the size of it

Your Cirrus maintenance manual may well have some guidance in the
section on storage, transport and rigging.

:-) Colin


Bruce- read the thread. He is putting a change in to eliminate those saddles.
UH


--
Bruce Greeff
T59D #1771

On Wednesday, February 1, 2017 at 7:25:12 PM UTC-6, Scott Williams wrote:

(2nd pad further towards the rear),
On the span where do the pads usually lie? 3/4 out from root?
Thanks,
Scott W.

On a wing with no change in taper along the leading edge (like on your Std Cirrus), I would put the one and only about at the root of the aileron. For simplicity's sake, you could center it on the root of the aileron. With a change in taper on the leading edge, immediately inboard of the taper change. You don't want to be too far outboard, as this puts a larger compression load into the rear spar during travel down that bumpy road. You also don't want it too far inboard, as then the entire weight of the wing will be resting on that little section of leading edge for the bumpy road.

Having troubles seeing how you could "pull the wing out far enough to access the cockpit without pulling the fuselage out." This would require pulling a wing back, crawling in the front door, around the nose ring, possibly also the spare tire, then back to the cockpit. Then, how much can you open the canopy inside the trailer? Seems to me to be MUCH easier to pull the fuselage out. I saw an LS3 get a scrape on the bottom of a newly refinished wing when the owner tried to pull the wing out with the fuselage still in place. Komet trailer. Was working on the dive brakes.

Do like the idea of the cloth in the cradle.

Steve Leonard