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12-16-2011, 10:57 AM
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Join Date: Jan 2005
Location: The Beautiful NJ Shore
Posts: 409
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Using a Rotisserie
I have access to a rotisserie already set up for an RV8. Here is my question. The builder who gave me the rotisserie first drilled and mounted his motor mount, then fabricated the rotisserie mount based on the holes he drilled in the firewall weldments. I do not have the motor mount and need to know how to drill the holes in the firewall. Are the factory holes in the stainless firewall accurate? What would be the minimum size hole to use, knowing I will have to enlarge them when I get the motor mount? Are 1/4" bolts big enough to hold the structure? Are the motor mounts from the factory 'real close' to the firewall holes (less than 1/16' off)? I suspect the jig they use to build the mounts is 'exact' to the plans, but I have heard that no 2 mounts are exactly alike.
Your comments, suggestions and pictures appreciated.
__________________
Greg Piney
RV-8 2547
Empennage Done!
Beginning Fuselage Final Assembly!
(Tub finished, on to Landing Gear).
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12-16-2011, 11:43 AM
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Join Date: Jun 2007
Location: Lee's Summit, MO
Posts: 743
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Rotisserie
I used 3/16" bolts and the pre-punched holes in the firewall. In general, these holes were a good match to the engine mount-but not perfect. The bolts were plenty strong enough to support the airframe...but I wouldn't climb into it on the rotisserie to be on the safe side.
I wouldn't recommend a 1/4" hole without having the engine mount on hand to match drill since this won't leave any margin for adjustment to the engine mount.
Good luck,
Mike
__________________
Mike Dooley
RV hitchhiker
RV8 SB
VAF#1067, EAA Chapter 91
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12-16-2011, 12:46 PM
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Join Date: Oct 2008
Location: Utah
Posts: 8,151
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Fuse is light I saw somewhere on the web a builder used AN3 bolts successfully. One bolt on the mount was off center a bit but he was able to drill it right because it was AN3. With bigger bolt he would be out of luck. I see if I could find the ref.
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12-16-2011, 01:01 PM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,145
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Quote:
Originally Posted by Transporter
I used 3/16" bolts and the pre-punched holes in the firewall. In general, these holes were a good match to the engine mount-but not perfect. The bolts were plenty strong enough to support the airframe...but I wouldn't climb into it on the rotisserie to be on the safe side.
I wouldn't recommend a 1/4" hole without having the engine mount on hand to match drill since this won't leave any margin for adjustment to the engine mount.
Good luck,
Mike
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Ditto that, it's what I did on my 9A.
__________________
Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid 
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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12-16-2011, 01:34 PM
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Join Date: Jan 2005
Location: Lake St. Louis, MO.
Posts: 2,346
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Quote:
Originally Posted by gpiney
...... What would be the minimum size hole to use, knowing I will have to enlarge them when I get the motor mount?.....Your comments, suggestions and pictures appreciated.
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Greg,
I drilled the holes for and used 3/16" bolts at the four corners of the firewall. As long as you do not attempt to climb inside the cockpit, AN3 bolts are more than adequate to do the job. Here's a suggestion. As you can see, I wanted to be able to rotate the fuselage with the gear legs attached, so when I built up the rotisserie, I extended it's height accordingly. The convenience cannot be overstated. Using the rotiserrie, internal access is much easier than the alternative and many, many tasks are easily accomplished while comfortably seated on a stool. The aft fuselage is supported by a padded sawhorse. I never needed any help to adjust the rotation, only making certain that when I did so, I did not accidentally "walk" the fuselage off the sawhorse!

__________________
Rick Galati
RV6A N307R"Darla!"
RV-8 N308R "LuLu"
EAA Technical Counselor
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12-16-2011, 07:07 PM
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Join Date: Nov 2007
Location: NJ
Posts: 1,747
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Hmmmm, must be talking about Hugh??"
__________________
My ATC opinion is NOT an official FAA recognized opinion, so any advice you get from me is ONLY my opinion.
Track my RV7A!!
Bought my flying -7A
Building an -8! (Fuse)
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12-17-2011, 05:27 AM
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Join Date: Apr 2011
Location: Melbourne, Victoria, Australia
Posts: 211
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Blue plastic
Greg,
(slightly off topic)
The picture is not that clear but it looks like you didn't remove the blue plastic from under the rivets. I doubt that is true. It doesn't have the usual "soldering iron" plastic deletion stips that fuses usually have.
Did you do it another way?
__________________
Gus Bisbal
RV7
Obsession only exists when someone else isn't doing it too.
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12-17-2011, 09:06 AM
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Join Date: Jan 2005
Location: The Beautiful NJ Shore
Posts: 409
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Quote:
Originally Posted by GusBiz
Greg,
(slightly off topic)
The picture is not that clear but it looks like you didn't remove the blue plastic from under the rivets. I doubt that is true. It doesn't have the usual "soldering iron" plastic deletion stips that fuses usually have.
Did you do it another way?
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Those are Rick's pictures. I've seen closeup pics of what he did with the blue plastic.
__________________
Greg Piney
RV-8 2547
Empennage Done!
Beginning Fuselage Final Assembly!
(Tub finished, on to Landing Gear).
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12-17-2011, 09:11 AM
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Join Date: Jan 2005
Location: The Beautiful NJ Shore
Posts: 409
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Quote:
Originally Posted by tkatc
Hmmmm, must be talking about Hugh??"
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Yup. He offered, I took.
__________________
Greg Piney
RV-8 2547
Empennage Done!
Beginning Fuselage Final Assembly!
(Tub finished, on to Landing Gear).
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12-17-2011, 01:23 PM
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Join Date: Apr 2011
Location: Melbourne, Victoria, Australia
Posts: 211
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oops
Quote:
Originally Posted by gpiney
Those are Rick's pictures. I've seen closeup pics of what he did with the blue plastic.
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yes sorry, I meant Rick. Care to share what he did?
__________________
Gus Bisbal
RV7
Obsession only exists when someone else isn't doing it too.
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