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  #1  
Old 02-15-2015, 01:38 PM
Barneybc12d Barneybc12d is offline
 
Join Date: Nov 2013
Location: Belleville, il
Posts: 124
Default Rotisserie

Yesterday I attached the pivot point to the front of my 14. I located it at the center of the structure so that when rotated there would be the same clearance from the floor right side up or upside down. During the night I realized it should pivot about the center of mass.

Today I will lower the pivot to the center of the 4 motor mount attach points. Have you experienced rotisserie builders found this to be a good balance point?

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14A #140111
started build 12/24/13
Empennage done, wings done, fuselage done, finish kit in progress.
Dormant 2017, 2018,2019
Back at it 3/20
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  #2  
Old 02-15-2015, 01:56 PM
nzrv8's Avatar
nzrv8 nzrv8 is offline
 
Join Date: Jun 2009
Location: Australia and NZ
Posts: 197
Default

I don't think the balance point matters so much as the work height. Mine isn't at the centre of mass, I set it up like yours is now, to make it a good working height when the fuselage is on its side. Even though my pivot point isn't central to the mass, it is still very easy to rotate, you just have to lock it using the pivot locking pin (Drill extra holes if you need different angles..)
I think yours looks good as is!
PM me for photos if you like.
Hugh
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  #3  
Old 02-15-2015, 02:06 PM
Barneybc12d Barneybc12d is offline
 
Join Date: Nov 2013
Location: Belleville, il
Posts: 124
Default

Sent you a PM Hugh.
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Barney Johnson
14A #140111
started build 12/24/13
Empennage done, wings done, fuselage done, finish kit in progress.
Dormant 2017, 2018,2019
Back at it 3/20
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  #4  
Old 02-15-2015, 03:15 PM
sblack sblack is offline
 
Join Date: Dec 2009
Location: Montreal
Posts: 1,489
Default

That pivot looks suspiciously like it comes from a HF engine stand.Am i right?
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  #5  
Old 02-15-2015, 06:29 PM
Barneybc12d Barneybc12d is offline
 
Join Date: Nov 2013
Location: Belleville, il
Posts: 124
Default

Yep
On sale plus 20% off with coupon. $50
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Barney Johnson
14A #140111
started build 12/24/13
Empennage done, wings done, fuselage done, finish kit in progress.
Dormant 2017, 2018,2019
Back at it 3/20
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  #6  
Old 02-15-2015, 08:42 PM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
Posts: 5,707
Default

I wish I had stopped and built one. It was a painful lesson.

I see you made one for the camera too.
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Lord Kelvin:
I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.
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  #7  
Old 02-15-2015, 09:49 PM
JRichichi JRichichi is offline
 
Join Date: Mar 2013
Location: League City, TX
Posts: 91
Default The CG moves around during the build

Hi Barney,

You're going to find that the CG of the fuselage is going to move around quite a bit depending on what you have clecoed/riveted onto the fuselage. What I did was make some wooden boxes on the motor mount that allowed me to add 25 lbm bags of lead shot where I needed it to get the CG back towards the center of rotation. Depending on what I had attached to the fuselage dictated where I added/removed the shot bags. It worked out pretty nice. I can rotate the fuselage with just finger pressure. Of course you want the rotation axis to be fairly close to the CG to begin with.

I hope this helps.

Jeff
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  #8  
Old 02-18-2015, 07:42 PM
Barneybc12d Barneybc12d is offline
 
Join Date: Nov 2013
Location: Belleville, il
Posts: 124
Default Works great


I raised the stand by adding a 7" piece of box tubing, removed the front casters and attached a piece of the shipping crate to level the pivot. The pivot on the firewall is centered between motor mount holes.
http://t.harborfreight.com/1000-lb-c...and-69886.html

The rear pivot is 3" below the tail.
The forward fuselage ended up 27" off the floor. Works great.
Thanks VAF.
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Barney Johnson
14A #140111
started build 12/24/13
Empennage done, wings done, fuselage done, finish kit in progress.
Dormant 2017, 2018,2019
Back at it 3/20
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  #9  
Old 03-08-2015, 03:19 PM
Ron B. Ron B. is offline
 
Join Date: Nov 2007
Location: Yarmouth, Nova Scotia
Posts: 2,468
Default

Just made my front pivot mount (thanks for the photos) and was wandering if I should lengthen the tubing the wheels are mounted on for better stability when rotating ?
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  #10  
Old 03-08-2015, 08:11 PM
JHartline JHartline is offline
 
Join Date: Dec 2012
Location: Carrollton, GA 5GA2
Posts: 270
Default Cable fairings

Barney,

Are those homemade rudder cable fairings? I'm planning on installing them as well.
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Carrollton, GA 5GA2
RV-14 - First flight 4/7/2019. Phase I complete as of 9/11/2019!!
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