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  #1  
Old 04-03-2017, 06:19 PM
RobinHou RobinHou is offline
 
Join Date: Mar 2009
Location: Pasadena, California
Posts: 181
Default RV-8 Empty Weight

I just did weight and balance using my EAA Chapter scales last weekend. I weighted myself and my helper to verify the accuracy of the scales and they seemed OK. My RV-8's empty weight came out to be only 1007 lb. I am not sure if this is correct since Vans website said RV-8 empty weight should be 1067-1120 lb. Although I only have minimum equipment, I don't think I should be 60 lb lighter than specs.

Here is how my RV-8 is equipped:

Lycoming YO-360-A1A & Sensenich prop
Slow built without primer
Exterior painted with 2 colors & clear coat
No interior paint, no carpet
Vans seats with cloth cover & 5-point harness
Dynon D60, 2.25" AS, G-meter, Flightline 760A & Narco AT-165
AmeriKing 450 ELT
AeroLed position strobe lights, no landing light
PC680 battery in the back
Weighted with wheel & leg fairings but no intersection fairing yet

If you have a light weight RV-8, do you mind sharing what you have? I don't want to re-weight it if I don't have to.

Thanks in advance,

Robin
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  #2  
Old 04-03-2017, 06:57 PM
RV8JD's Avatar
RV8JD RV8JD is offline
 
Join Date: Jan 2005
Posts: 279
Default It's Possible

My RV-8 came out at 1111 pounds. These are the differences I see between mine and yours:

- QB, some primer, similar paint scheme as yours but mine may be a little heavier due to some extra touches
- Hartzell constant speed prop; heavier than your FP prop
- Christen inverted oil system, flop tube in left tank; heavier than yours
- Concorde battery; heavier than your PC 680
- Oregon Aero confor foam front seat cushions (leather), Van's in back; heavier than your setup
- Full cloth interior and carpets; heavier than yours
- Landing light in each wing; heavier than yours
- Grove aluminum gear; lighter than yours
- Fire extinguisher

Did your engine have oil in it when you weighed the airplane?
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Carl N.
Arlington, WA (KAWO)
RV-8, 1970 Hours

Last edited by RV8JD : 04-03-2017 at 08:11 PM.
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  #3  
Old 04-03-2017, 07:53 PM
RobinHou RobinHou is offline
 
Join Date: Mar 2009
Location: Pasadena, California
Posts: 181
Default

Carl,

Yes, I weighed it with 6 qt. of oil and empty tanks. Do you think your extra may add up to 100 lb?

I just don't have much conference in my weight. I must have messed up somewhere.

Thanks for your comments.

Robib
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  #4  
Old 04-03-2017, 07:57 PM
RV8JD's Avatar
RV8JD RV8JD is offline
 
Join Date: Jan 2005
Posts: 279
Default

Quote:
Originally Posted by RobinHou View Post
Carl,

Do you think your extra may add up to 100 lb?

Robib
I forgot my landing lights and added those to my post above. Those differences listed in my post could be close to 100 pounds, surely 70 or so.

You're making me think I should put my RV-8 on a diet and get it lighter!
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Arlington, WA (KAWO)
RV-8, 1970 Hours

Last edited by RV8JD : 04-03-2017 at 08:05 PM.
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  #5  
Old 04-03-2017, 09:46 PM
SHIPCHIEF SHIPCHIEF is offline
 
Join Date: Mar 2008
Location: Seattle
Posts: 1,278
Default

My RV-8 was built as light as I could. Mostly primed inside, only the fiberglass and the spot in front of the windshield are painted on the outside. Oregon Aero seats, Dynon D-10a, Terra NAV/Com ADF and Transponder.
Parallel valve, conical mount O-360 with Superior Cold Air sump. Airflow performance fuel injection, Ultralight starter and Denso Mini alternator. Catto 3 blade prop, PC680 battery on fire wall. 6 quarts of oil, & wheel pants with leg fairings. (I don't think intersect fairings then)
1034 Lbs
No wall panels or carpet. Oil Screen (no spin on oil filter) LED position lights, NOVA HR strobe pack & 3 tubes, no landing or Taxi lights.
I think your weight might be greater than the scales told, but if true, my hat is off to YOU!

Lately I removed all the TERRA gear and installed Garmin Com & transponder for a slight weight reduction and better communication.
It never stops...You have to be careful, most planes gain weight as they get older...
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Scott Emery
http://gallery.eaa326.org/v/members/semery/
EAA 668340, chapter 326 & IAC chapter 67
RV-8 N89SE first flight 12/26/2013
T-18, and the wife has an RV-4
There is nothing-absolute nothing-half so much worth doing as simply messing around with Aeroplanes
(with apologies to Ratty)
2016
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  #6  
Old 04-04-2017, 12:30 AM
Alan Carroll's Avatar
Alan Carroll Alan Carroll is offline
 
Join Date: Jul 2007
Location: Madison, Wisconsin
Posts: 720
Default

Robin,

If you're concerned about this you might try weighing with a different set of scales. This would be a lot more meaningful than trying to compare to other planes.

My experience is that getting a reliable weight is harder than I expected. I've done several weighings using different scale setups and each time got a different answer each time. Its not easy to accurately calibrate a scale at 500 pounds.
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RV-8 N12AC
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  #7  
Old 04-04-2017, 08:30 AM
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David-aviator David-aviator is offline
 
Join Date: Feb 2005
Location: Chesterfield, Missouri
Posts: 4,290
Default

Mine came in at 1029 with CG at 78.64, where is your CG?

I am light weight with basic BPE Superior IO360 180 HP with Catto 3 blade.

You could be in ball park but I know your prop is heavier.
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David Domeier
RV-7A...Sold #70374
The RV-8...#83261 flying as of 6/16/2014
RV-3 ....fan

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  #8  
Old 04-04-2017, 11:07 AM
RobinHou RobinHou is offline
 
Join Date: Mar 2009
Location: Pasadena, California
Posts: 181
Default Thanks, Will Re-weigh

Scott, it was not my priority to build light. I did take the less expensive route in my built to save costs and that is how it turned out. I don't mind having a light 8, but I just have no confidence in my empty weight because it is much lighter than I expected.

Alan, yes, I agree and I will re-weigh it when I have access to a different set of scales.

David, my CG is 78.78 as weighed last weekend. I would not be concerned if my empty weight is a few lb lighter than Vans 1067 lb, and I don't think mine should be lighter than yours when my prop is heavier.

Thank you all for your comments. I will report back after I re-weigh my bird.
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  #9  
Old 04-04-2017, 11:12 AM
Robert Anglin Robert Anglin is offline
 
Join Date: Mar 2008
Location: houston, texas
Posts: 598
Default You are just fine.

Yes, you are in good company here with this weight.
Our 8 is 1008 Lbs. empty with oil. It has nice cloth seats, but no frills or sound proofing. We have an IO-360 ECI engine with their fuel system and a none counter weighted crank, standard Mags. A Prince 68X81" carbon P tip prop. It dose have a nice Garmin panel with AP and GS. We coated everything inside and out with 2-3 coats of the mill. 7020 or SW-988 primer. That look was not intended to last, but the more we look at it and find how easy it is to spot fix and take care of along with mill. markings and a squadron insignia is starting to have some appeal. Most of the new panel installs have saved a lot of weight from what we would have had in the past. You sound good to me.
Hope this helps, Yours, R.E.A. III #80888

Last edited by Robert Anglin : 04-04-2017 at 11:15 AM.
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  #10  
Old 04-04-2017, 11:47 AM
RobinHou RobinHou is offline
 
Join Date: Mar 2009
Location: Pasadena, California
Posts: 181
Default Thanks!

Robert, it is good to hear that our weights are only 1 lb apart. Maybe I did not messed up as badly as I thought I did. Anyhow, I will re-weigh when I can, but your post sure eases the bad feeling I had for the past few days. THANK YOU!
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