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Grove Gear for 601XL

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a.s.elliott(at)cox.net
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Posted: Fri May 25, 2007 7:43 am Post subject: Grove Gear for 601XL

I have the Grove gear for my 601XL/TD in the living room, not installed  yet.  I ordered it from the factory with the gun-drilling and I have to  say, "They are a work of art."  Especially compared to the factory gear,  which is about 15 lbs heavier.  They are 4.5" wide and .875 thick across  the flat, while the legs are tapered.

  

 They make them with a multi-step process from 7075, which involves cutting  the blank and doing the gun-drilling and machining for the axles, annealing and  primary bending, 1/2 heat treating, secondary bending, final heat treating and  final cold check and touch-up.  The fore and aft edges are radiused in the  leg part for lower drag without needing full fairings.  The factory finish  is mill, but I have done a wet sanding pass with 1200 on the legs and am sure  they will polish up really nicely.

  

 I also ordered a pair of "radius blocks" from Grove which I will attach to  the gear brackets parallel to the centerline, which insure that the gear does  not torque load the fuselage and that the gear will deflect straight along  the axis when it bends.  I plan to use the standard rubber strip and  bracket on the bottom.

  

 Finally, the narrower width of the gear means that I will have some leeway  in fore-aft positioning to fine tune the take-off and landing characteristics  with regard to the final CG location.  My plan is to use temporary plywood  blocks during the test phase and then replace them with permanent aluminum when  done.

  

 FWIW,

 Andy Elliott, Mesa, AZ

N601GE (reserved)

601XL/TD/QB, Corvair,  building...

  

  

   [quote][b]

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John Bolding

Joined: 23 May 2006
Posts: 281

Posted: Fri May 25, 2007 10:39 am Post subject: Grove Gear for 601XL

I've got no dog in this hunt (thankfully) but let  me interject something into this thread. 7075-T651 is NOT a corrosion  resistant alloy of aluminum.  I would LOVE to save 15# by using  one of their gear but cannot see it for something that's going on  floats.

 Chris made the 601/701/801 from 6061 for several  reasons, one of them was it's more corrosion resistant than 2024T3.

  

  7075 is WORSE than 2024T3 in that  regard. 

  

 Certainly this fact can be mitigated to a certain  degree by proper coatings and increased maintenance/inspection.  The rear  spar fittings on my Glasair have been replaced twice due to intergranular  corrosion, I was told (by Glasair) they are 7075t6. Last go-round I  welded some up from 4130.  

 Not trying to talk anyone out of it or throw any  rocks at a product, just making a point that someone might not have considered.  

 LOW&SLOW     John 

 [quote]    

   I have the Grove gear for my 601XL/TD in the living room, not installed    yet.  I ordered it from the factory with the gun-drilling and I have to    say, "They are a work of art."  Especially compared to the factory gear,    which is about 15 lbs heavier.  They are 4.5" wide and .875 thick across    the flat, while the legs are tapered.

    

   They make them with a multi-step process from 7075, 

    

   Andy Elliott, Mesa, AZ



    

    

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