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  #11  
Old 09-11-2021, 06:32 PM
johnf_1 johnf_1 is offline
 
Join Date: Nov 2012
Location: santa rosa
Posts: 75
Default 903

My 4 is down to 903 as of a couple of months ago: painted (no primer); narrow deck; Pacesetter 200; Dynon Skyview; EarthX battery; McCreary tires; Bendix mags; 4 pipe exhaust. How can I lighten it? J
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  #12  
Old 09-12-2021, 09:43 AM
jrs14855 jrs14855 is offline
 
Join Date: Apr 2008
Location: Lake Havasu City AZ
Posts: 2,602
Default Weight

This requires thinking WAY outside the box:
Move the engine forward to solve CG issue
Lycon has some ideas for weight reduction on Lycoming.
Carbon fiber cowl, wheel pants, spinner, wingtips etc.
Titanium gear legs.
Magnesium wheels
Drill lightening holes in brake discs.
"Lamb" tires
Fuselage tank only??
Titanium tail spring.
Starter only with power plug for starting.
Remove rear seat controls??
Removeable rear seat cushions.
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  #13  
Old 09-12-2021, 12:18 PM
Taltruda Taltruda is offline
 
Join Date: Oct 2017
Location: Las Vegas, NV
Posts: 885
Default

Fill the tubes with helium, go on a diet, fly naked, remove the tail wheel and replace it with skid so you can then also remove main wheel brakes…
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Tom
Las Vegas
RV-4 flying…
RV-8 empenage finished 10-2020

Wings Started.. 11-2020
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  #14  
Old 09-12-2021, 06:01 PM
n82rb's Avatar
n82rb n82rb is offline
 
Join Date: Jan 2007
Location: fort myers fl
Posts: 1,071
Default

Quote:
Originally Posted by johnf_1 View Post
My 4 is down to 903 as of a couple of months ago: painted (no primer); narrow deck; Pacesetter 200; Dynon Skyview; EarthX battery; McCreary tires; Bendix mags; 4 pipe exhaust. How can I lighten it? J
bendix mags 4.5 lbs inpulse, 4.0 without

light speed 2.5 lbs
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  #15  
Old 09-12-2021, 07:03 PM
Captain Avgas Captain Avgas is offline
 
Join Date: Oct 2005
Location: Melbourne, Australia
Posts: 2,003
Default

Quote:
Originally Posted by rvnor View Post
My question is do you think it will be possible to build the RV4 with an empty weight down to 830 lbs, 70+ lbs down from std weight.
I suppose the real question is.....why bother????
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You’re only as good as your last landing
Bob Barrow
RV7A
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  #16  
Old 09-14-2021, 06:45 AM
Captain Avgas Captain Avgas is offline
 
Join Date: Oct 2005
Location: Melbourne, Australia
Posts: 2,003
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Quote:
Originally Posted by Taltruda View Post
Fill the tubes with helium, go on a diet, fly naked.
Better still, insist that your passenger has to fly naked as well
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You’re only as good as your last landing
Bob Barrow
RV7A

Last edited by Captain Avgas : 09-14-2021 at 08:08 PM.
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  #17  
Old 09-17-2021, 07:07 AM
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smokyray smokyray is offline
 
Join Date: Jan 2005
Location: TX32
Posts: 1,954
Default Weight a minute!

GREAT discussion!
Way back in the day my brand new RV4 tipped the FAA scales at 915 lbs. I took this as a victory until I thought, why do I need an electrical system, starter, battery etc for MY mission? Good question, so I removed all the above and yes, my unpainted, ND 0-320/Sterba HH radio no transponder Vans masterpiece weighed in at 889 lbs, a bantam weight fighter!
Practical?
For me yes, ergonomically oriented, maybe not. But who cares, right, I built it per my own specifications right?
Hmmmm....
Well I did eventually compromise adding back lightweight electrical system components, ditching the Mags for EI and settling for 925lbs full up with paint.
So how did the " light flight " characteristics differ from the latter?
Not a huge noticeable change but the 889lb 4 was a delight, great aerobatics, 1v1's with my F16 Bros, amazing STOL etc.

However, even heavy RV4s are delightful...my 1100lb+ HR2 with 300HP was a case in point!!! Yeeha!

Smokey

Last edited by smokyray : 09-17-2021 at 07:11 AM.
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  #18  
Old 09-19-2021, 05:40 PM
Michael Henning Michael Henning is offline
 
Join Date: Jun 2011
Location: Nashua, NH
Posts: 546
Default Weight

1018 pounds, full IFR. G3X, GPS175. Autopilot, WW150 Cs prop, O2, inverted fuel and oil with accumulator. Flies great.
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Mike
RV-4 #2750
N654ML
IO-360
WW150C Prop
1018 lbs
Flying
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  #19  
Old 09-22-2021, 01:10 AM
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pitts flyer pitts flyer is offline
 
Join Date: Nov 2012
Location: Sacramento, CA
Posts: 58
Default

Empty wt 925. IO 360 (9:1 compression), dual SDS EI and FI. 2 lithium batteries, 1 alternator. Minimal paint--tailfeathers and fiberglass parts. 3 blade FP Catto prop. Trig radio and transponder, VFR panel with Garmin 660. ADS-B in and out. MGL Engine monitor, and MGL instrument for AS, Alt and VS. Climbs pretty good....
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Dave M
RV-4 finished.
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