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01-21-2014, 12:24 PM
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Join Date: Apr 2007
Location: -
Posts: 502
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Nuts about saving weight
A fun weight saving fact:
There are about 425 AN365-1032s in your RV-10. If you replace them all with MS21042-L3s you'll save about 1.7 lbs.
If you return the AN365s to Van's and buy the MS21042s from Spruce, it will cost about $109 or $64/lb.
David
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01-21-2014, 12:54 PM
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Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,435
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Those particular nuts are lubricated and need different torques than the nuts in the kit. It's not merely the locking torque that't affected, it's the basic torque.
Anyone have any idea what the torque shuld be?
Dave
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01-21-2014, 02:35 PM
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Join Date: Apr 2007
Location: -
Posts: 502
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Dave,
It looks like the spread between a -3 and and dry film lube -L3
is small and much less than the natural variation among different nuts of the
same type.
David
Citation: http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA024893
Last edited by digidocs : 01-21-2014 at 02:45 PM.
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01-21-2014, 03:23 PM
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Join Date: Feb 2009
Location: San Jose, CA
Posts: 164
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Quote:
Originally Posted by digidocs
A fun weight saving fact:
There are about 425 AN365-1032s in your RV-10. If you replace them all with MS21042-L3s you'll save about 1.7 lbs.
If you return the AN365s to Van's and buy the MS21042s from Spruce, it will cost about $109 or $64/lb.
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Another option to consider is AN364 nuts. Everywhere that I've needed a nut where clamping force isn't critical and bolts are loaded only in shear (adel clamps, seat belt attach bolts, etc.), I've used these. I imagine there are quite a number of other places on the airframe that could use these, but I would want to run those past Van's or a sufficiently qualified engineer.
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01-21-2014, 03:36 PM
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Join Date: May 2010
Location: Denver
Posts: 564
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Quote:
Originally Posted by digidocs
A fun weight saving fact:
There are about 425 AN365-1032s in your RV-10. If you replace them all with MS21042-L3s you'll save about 1.7 lbs.
If you return the AN365s to Van's and buy the MS21042s from Spruce, it will cost about $109 or $64/lb.
David
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That is cheap compared to high end bicycles. Figure on about $1000 per pound to lower the weight on a good bike. We have a 21 lb. tandem that cost more than 4 years of college(back in the 60s)
Jim Berry
RV-10
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01-21-2014, 05:44 PM
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Join Date: Nov 2010
Location: Australia
Posts: 53
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I think most reading this could reduce the weight of the total take off weight by at least 1.7 lbs by going for a walk every day 
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01-21-2014, 06:17 PM
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Join Date: Jan 2007
Location: Battleground
Posts: 4,348
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Quote:
Originally Posted by chrish
I think most reading this could reduce the weight of the total take off weight by at least 1.7 lbs by going for a walk every day 
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And add "do your business" as part of you preflight
I would gladly pay $64 a pound if you find another 60 of these changes to shave #100 from my 6. ( I'm not giving up my 180hp or CS etc....)
The reality is, the basic bare airframe is pretty well designed and all the little things I see posted, when added together, still make very little overall difference.
__________________
Smart People do Stupid things all the time. I know, I've seen me do'em.
RV6 - Builder/Flying
Bucker Jungmann
Fiat G.46 -(restoration in progress, if I have enough life left in me)
RV1 - Proud Pilot.
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01-21-2014, 06:51 PM
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Join Date: Apr 2007
Location: -
Posts: 502
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All the little savings add up! Here are a few others that seem to be good wins:
- LiFePO4 battery (~10 lbs, $30/lb) over a PC680
- 2 blade composite CS prop (10-15 lbs, ~$100/lb)
- Cheap tires with less rubber (can be 2+ lbs per wheel, $0/lb)
- ECI tapered fin cylinders (~3lb, $???)
- Lighter and less instruments/avionics (TT22 transponder weighs 0.8 lbs, MGL V6 com or similar weighs 0.5 lbs, no vacuum pump, simple EFIS instead of steam gauges)
- Replace engine hoses with SS hardlines (one -8 builder reported 7 lbs)
- Less interior/insulation
Saving weight is so fun!
David
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01-22-2014, 07:05 AM
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Join Date: Sep 2007
Location: New Brighton, Pa. 15066
Posts: 286
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CHEEP THIN TIRES !
Ever had a FLAT at a field away from home base ? That day I wish I had solid rubber tires ! Ha .  and I would have paid plenty $$$$$ to have them .
__________________
14 planes owned ,11 bought ,3 built .
RV-8 N808H ,Sold
RV-6 Sold 😔
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01-22-2014, 07:19 AM
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Join Date: May 2006
Location: Houston
Posts: 2,012
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Quote:
Originally Posted by digidocs
All the little savings add up! Here are a few others that seem to be good wins:
- LiFePO4 battery (~10 lbs, $30/lb) over a PC680
- 2 blade composite CS prop (10-15 lbs, ~$100/lb)
- Cheap tires with less rubber (can be 2+ lbs per wheel, $0/lb)
- ECI tapered fin cylinders (~3lb, $???)
- Lighter and less instruments/avionics (TT22 transponder weighs 0.8 lbs, MGL V6 com or similar weighs 0.5 lbs, no vacuum pump, simple EFIS instead of steam gauges)
- Replace engine hoses with SS hardlines (one -8 builder reported 7 lbs)
- Less interior/insulation
Saving weight is so fun!
David
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I'm guilty of several of the items above. Just reduced hose weight by 15 oz (one long run) by rerouting. Saved 5 lbs (yes, 5!) going from heavy, Hooker harnesses to Crow. New starter time after 1500 hrs (good excuse anyway), saved 1.8 lbs with the new XLT Sky Tec. Oh yea, two P-mags as well... Next step, Grove gear legs.
And yes, I need to get out and walk more to reduce front seat occupant loads. But these other things are icing on the cake!
Thanks for the work on the MS21042 nuts. Excellent idea!
Last edited by Low Pass : 01-22-2014 at 12:19 PM.
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