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  #1  
Old 08-04-2011, 02:34 PM
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DanH DanH is offline
 
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Default One-piece Grove Gear

Grove aluminum gear legs are a popular option with RV-8 builders. Compared to OEM steel legs, the standard aluminum legs save 17 lbs and the airfoiled legs save 11 lbs. Both types are drilled for an internal brake fluid passage.

http://groveaircraft.com/cat1415.html

One subject at OSH this year was the idea of adapting one-piece gear to the RV8. Many (or most) RV8 ground loop incidents result in damage to the gear tower structures and forward fuselage skins. It is an expensive and time-consuming repair. One piece gear would greatly lessen many of the peak fuselage structure loads. The penalty would be the additional weight of the connecting section, but total weight is still likely to be less than a stock steel gear.

Grove is quite willing to build one-piece airfoil gear for the -8. They would like 6-10 orders, as they do for batch production of the two-piece airfoil gear.

Like you, I'm aware of sensitivity in certain quarters regarding design modification, and a one piece gear would require some modification of the belly. I'm not aware of any published work in this area, and I've done no personal review. I do recall mention of one-piece gears on past -8's.

If I had realized the possibility of a one-piece gear a few years ago, my airplane would have it....so I volunteered to open the subject.

Comments?
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  #2  
Old 08-04-2011, 02:52 PM
benbell4140 benbell4140 is offline
 
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Dan, I would of definantly went one piece if I had known they were willing to build them. I had a one piece grove gear setup on my avid flyer and it was very nice. Not trying to jack the thread but does anyone know the reason 8's don't use engine mounted gear?
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  #3  
Old 08-04-2011, 05:18 PM
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Neal@F14 Neal@F14 is offline
 
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I also inquired about the 1-piece gear for the -8 at Grove's booth and he said that while it is not currently available as a regular production item, they are more than happy to custom-make you a one-piece main gear for an -8 either standard profile, or airfoil profile, and either with or without gun-drilled integral brake lines. All it takes is a special order and some extra moolah and they'll gladly make whatever you want

It would be beneficial if several builders were interested at the same time to get together so they could manufacture them in a batch instead of one at a time... might even offer a substantial discount.

I may be mistaken, but I think Doug Ripley may have built an RV-8 using a custom Grove 1-piece gear some years ago. It might have even been that very first RV-8 I ever got to ride in. I knew nada about RVs back then.
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  #4  
Old 08-04-2011, 05:19 PM
SHIPCHIEF SHIPCHIEF is offline
 
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I see on Grove's site that they offer one piece gear for Skybolts and Stardusters in the same gross weight (or a few pounds more).
Are any of these adaptable? They seem very afforable. When I get home, I'll measure my plane and think about it.
Perhaps an RV-8a would be a good starting point, and the gear towers wouldn't need to be so big?
Still, the center piece of the gear would be under your legs...
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  #5  
Old 08-04-2011, 06:07 PM
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Back when I was building my -8, the one-piece was a rumor on the horizon - if it had existed, I probably would have really studied it and would have picked it unless I saw some clear reason it was a problem. Seems like an elegant solution to me!
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  #6  
Old 08-04-2011, 06:42 PM
PCHunt PCHunt is offline
 
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Just curious, has anyone asked Van's why the plane was designed the way it is? Surely some serious modification to the fuselage structure where the new gear would attach would be required?
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  #7  
Old 08-05-2011, 01:33 AM
DeltaAlphaZulu DeltaAlphaZulu is offline
 
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I'm probably quite a long way from that stage, but Grove gear is already one of my planned modifications to stock standard kit. Yes, I'd definitely be interested, particularly that there is currently a good $USD - $AUD exchange rate.
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  #8  
Old 08-05-2011, 07:39 AM
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I spoke with Grove at Oshkosh regarding the 1-piece gear and they are very willing to make a batch once he receives enough orders. My deposit has already been paid.
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  #9  
Old 08-05-2011, 08:30 AM
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Quote:
Surely some serious modification to the fuselage structure where the new gear would attach would be required?
No.

Quick look, no detailed analysis: It would require reviewing the contribution of the two F-802M intercostal ribs (DWG 61) and designing a substitute if simple deletion is inappropriate. The forward section of the F850-1 belly skin would be removed and re-tasked as a center cover plate, or ditch the two F-861PP outboard cover plates and fabricate a new one-piece cover. Either way, 802K and L get a few more nutplates.

Again, first glance: Nothing about the outboard leg clamps would change. I'd retain the U806 inboard wear plate and its AN4 attach hardware, drop the U804 clamp bracket, but retain the AN7 bolt, with a hardened washer under the head.
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Last edited by DanH : 08-05-2011 at 08:38 AM.
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  #10  
Old 08-05-2011, 08:46 AM
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Toobuilder Toobuilder is offline
 
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Aside from possible protection against ground loop damage, what is the benefit of the single piece? It's more weight, plus you are still stuck with the towers intruding into the cockpit.
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