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  #1  
Old 03-14-2017, 07:22 AM
boandrv7a boandrv7a is offline
 
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Location: denver
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Default RV-10 CG

Hey Guy's - I'm curious, are you RV-10 drivers able to use your entire useful load? I also have a V35B and, until I had a bunch of **** taken out of tail (30 years of old wire, King HSI, etc), I had to be careful how I loaded it. I can use my full 1,300 lb useful load, but I still need to be careful.

Before I bought my 7a, I looked at a few 10's for sale but then decided to upgrade the Bo and buy an 7a.

Just curious about the actual CG envelope and what little gotcha's are out there.

Thanks!

Jim
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Last edited by boandrv7a : 03-14-2017 at 08:05 AM.
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  #2  
Old 03-14-2017, 07:38 AM
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9GT 9GT is offline
 
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I was able to fill my plane up to the maximum gross weight of 2700 pounds.

N959RV Weight & Balance Data
Empty Weight: 1703 lbs. (8 qts oil & Wheel Fairings @ #3.75 lbs. each
Gross Weight: 2700 lbs.
Datum: 99.44" forward of wing leading edge
CG Range Limits: 107.84" - 116.24" aft of Datum
Fuel: 108.90" Aft of Datum
Pilot/Front Passenger: 114.58" Aft of Datum
Rear Seat Passengers: 151.26" Aft of Datum
Baggage: 173.50" Aft of Datum
Right Wheel: 688 lbs., arm 123.85", moment 85209
Left Wheel: 685 lbs., arm 124.15", moment 85043
Nose Wheel: 330 lbs., arm 49.90", moment 16467
Total Weight: 1703 lbs., moment 186719
Empty CG: 109.64" (moment divided by weight)

To Compute Loaded CG
Multiply weight by arm = moment
Add all weights
Add all moments
Divide total moment by total weight
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  #3  
Old 03-14-2017, 08:38 AM
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Mike S Mike S is offline
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Pretty easy to load a 10 up to max--------but if you do, be careful to compute the C/G for the landing.

Due to burning off fuel in the flight, you can go out of C/G to the rear.
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  #4  
Old 03-14-2017, 08:41 AM
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Auburntsts Auburntsts is offline
 
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Quote:
Originally Posted by Mike S View Post
Pretty easy to load a 10 up to max--------but if you do, be careful to compute the C/G for the landing.

Due to burning off fuel in the flight, you can go out of C/G to the rear.
Mike, as fuel burns the CG moves forward, not aft.
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  #5  
Old 03-14-2017, 08:47 AM
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Mike S Mike S is offline
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Quote:
Originally Posted by Auburntsts View Post
Mike, as fuel burns the CG moves forward, not aft.
Not at gross weight, only when lightly loaded such as single SOB.

Reread my first line--------I was referring to the C/G shift of a max loaded plane.
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Phase 1 done, 2/4/2011

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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  #6  
Old 03-14-2017, 08:57 AM
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Auburntsts Auburntsts is offline
 
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Quote:
Originally Posted by Mike S View Post
Not at gross weight, only when lightly loaded such as single SOB.

Reread my first line--------I was referring to the C/G shift of a max loaded plane.
Yep my bad!
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  #7  
Old 03-14-2017, 09:39 AM
boandrv7a boandrv7a is offline
 
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Thanks guys! Great info!

Jim
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  #8  
Old 03-14-2017, 10:45 AM
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rleffler rleffler is offline
 
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Quote:
Originally Posted by boandrv7a View Post
Hey Guy's - I'm curious, are you RV-10 drivers able to use your entire useful load? I also have a V35B and, until I had a bunch of **** taken out of tail (30 years of old wire, King HSI, etc), I had to be careful how I loaded it. I can use my full 1,300 lb useful load, but I still need to be careful.

Before I bought my 7a, I looked at a few 10's for sale but then decided to upgrade the Bo and buy an 7a.

Just curious about the actual CG envelope and what little gotcha's are out there.

Thanks!

Jim

There are some that have certificates showing higher gross weight than 2700lbs, although mine is not one of them. I've not had any problems flying at gross weight. CG is within specs, but usually pretty far aft.

My advice is to model your CG at both the beginning and end of the flight. Also think about how you load and unload your aircraft. Here's a scenario:
  1. Back seat passenger weighs 50lbs more than front seat passenger, plus an 80lb dog in the other rear seat.
  2. Pilot gets out first.
  3. Front seat passenger gets out
  4. When they step down on the step, the RV-10 tails sits on the tarmac.
  5. Small crack in the rudder fairing

The issue is that there is minimal fuel in the tanks to function as a counter balance. So we ponder a bit and work through the logistics to prevent this from happening again. We stop at the same airport on the return trip.
  1. Back seat passenger weighs 50lbs more than front seat passenger, plus an 80lb dog in the other rear seat.
  2. Pilot gets out first.
  3. Rear seat passenger gets out
  4. When they step down on the step, the RV-10 tails sits on the tarmac.
  5. Major cracks in the rudder fairing because the additional weight on the step increases the force the tails hits the tarmac.

What we didn't realize is that we parked in a different spot to fuel this instance. It happened to be on about a 15 degree incline sloping downwards towards the tail. The physics on the incline out smarted us with attempting to offload the aft weight first.

So the point I'm attempting to make is that CG is important on the ground too! BTW, I've seen the same thing happen to a 7A at gross too. The first person getting out steps on the step and down she goes.

I've also resolved the situation by having the two people swap positions regardless of whose dog is in the back. Put the heaviest occupant in the right front if all the seats are full.

bob
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  #9  
Old 03-14-2017, 02:25 PM
BobTurner BobTurner is offline
 
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Just like with your V tail, the answer is "it depends". Some builders have put air conditioning, extra batteries, heavy primers, etc., in the tail. They do need to exercise caution with regard to aft cg when loading to max. OTOH, my empty cg is pretty far forward (solo, I carry 20 lbs of water in the back) and I seldom have cg problems even loaded to max. (I dump out the water). Just like other airplanes, the pitch feel is much lighter at aft cg. And, to elaborate on the above posts, you must check cg at landing configuration. If you start out near the forward limit, cg moves forward as you burn gas. And if you start out near aft limit, cg moves aft as you burn gas.
Edit: To see possible variations, look at David's wt and balance numbers above. My empty weight is 100 lbs lower, and empty cg 2" further forward, than his. So there's a lot of plane to plane variations.

Last edited by BobTurner : 03-14-2017 at 02:31 PM.
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  #10  
Old 03-14-2017, 03:09 PM
rvdave rvdave is offline
 
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Quote:
Originally Posted by rleffler View Post
[*]Pilot gets out first. [*]Rear seat passenger gets out[*]When they step down on the step, the RV-10 tails sits on the tarmac.
bob
Bob,
Trying to grasp this scenario, if one stays standing on the wing walk would this still happen?
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