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  #1  
Old 01-19-2016, 07:34 PM
scsmith scsmith is offline
 
Join Date: Jan 2008
Location: Ashland, OR
Posts: 1,932
Default New spars in progress

If you peek once in a while on the HP-24 project page, you have seen us laying up composite skins for new tapered wings for my RV-8 and Bob Mills Rocket-6.

We've now started making spars. The taper is evident in the pictures.



Stand by, trying to get pictures right side up....

These are conventional aluminum spars, very similar in concept to Van's RV-7/8 spar. Although, of course, the thickness change along the span, rivet spacing, etc. is tailored to the new wings. For the Rocket-6, the spar extends into the fuselage the same way it does on a standard RV-6. The skins bond to the spar along the wide flanges, using a Boeing-certified treatment+primer process and using high strength structural adhesive. (if you are curious, it is AC-130 sol-gel, BR-6747 primer, and Hysol 9360 adhesive.

Of the various designs for transitioning from conventional aluminum structure to composite construction, this was the lightest and highest-confidence concept I came up with.

By this time next year, I hope to be doing static load testing on the first pair of wings.
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Steve Smith
Aeronautical Engineer
RV-8 N825RV
IO-360 A1A
WW 200RV
"The Magic Carpet"
Hobbs 515 in 9 years (would have flown more this year if not for fire smoke)
also LS-6-15/18 sailplane
VAF donation Dec 2017

Last edited by scsmith : 01-01-2018 at 06:59 PM.
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  #2  
Old 01-19-2016, 07:44 PM
Mike S's Avatar
Mike S Mike S is online now
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Location: Dayton Airpark, NV A34
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Default

Lookin good Steve, are you still working at Bob K.s place or is this up in Oregon?
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Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"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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  #3  
Old 01-19-2016, 08:12 PM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
Posts: 4,553
Default

Quote:
Originally Posted by scsmith View Post
Stand by, trying to get pictures right side up....
They come out right side up when opening in a new tab. I ran across this once here. I had to rotate and save as a new name for them to post correctly.
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RV-7
1st Flight 1-27-18
Phase II 8-3-18
Repairman 11-15-18
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  #4  
Old 01-19-2016, 10:09 PM
scsmith scsmith is offline
 
Join Date: Jan 2008
Location: Ashland, OR
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Default

Quote:
Originally Posted by Mike S View Post
Lookin good Steve, are you still working at Bob K.s place or is this up in Oregon?
The composite work is all at Bob K's shop in Arnold, CA. The spars we can make in our own shops over the winter.
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Steve Smith
Aeronautical Engineer
RV-8 N825RV
IO-360 A1A
WW 200RV
"The Magic Carpet"
Hobbs 515 in 9 years (would have flown more this year if not for fire smoke)
also LS-6-15/18 sailplane
VAF donation Dec 2017
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  #5  
Old 01-19-2016, 11:10 PM
Bob Kuykendall's Avatar
Bob Kuykendall Bob Kuykendall is offline
 
Join Date: Sep 2006
Location: Douglas Flat, CA
Posts: 577
Default Photos fixed!

I fixed the photos, they should show right-side up now.

Thanks, Bob K.
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  #6  
Old 01-19-2016, 11:36 PM
aerhed aerhed is offline
 
Join Date: Dec 2008
Location: Big Sandy, WY
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Show me ribs please.
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Actual repeat offender.
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  #7  
Old 01-20-2016, 12:07 AM
DaAV8R DaAV8R is offline
 
Join Date: Jul 2009
Location: Lee's Summit, MO
Posts: 742
Default Tapered wings

Awesome!!!!..........can you share any basic design goals? Have a link to the HP-24 page?
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Robert Williams
Lee's Summit, MO
RV-8 - Empennage & Wings Done
Working on Fuse
O-360-A1A

1946 Cessna 120
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  #8  
Old 01-20-2016, 07:58 AM
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grubbat grubbat is offline
 
Join Date: May 2012
Location: Ga
Posts: 595
Default Good stuff

Thanks for sharing Steve, very exciting to hear about this endeavor!
Is this new wing designed to turn your speedster RV-8 into a soaring machine or are you designing a better wing? Are you planning on designing a more "robust" vertical/horizontal attach point also? Maybe something that offers a tad bit more margin? If so, I'm even more interested. 😄
Thanks,
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Craig

RV-3 Sold
RV-4 Sold
RV-6a Sold
RV-9 IO-360 CS, Built and Flying
Comanche 260 - poor mans RV-10
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  #9  
Old 01-20-2016, 08:52 AM
mtnclimber mtnclimber is offline
 
Join Date: Apr 2010
Location: Nathrop Colorado
Posts: 64
Default RV-8 Motorglider ???

Steve,

I've looked and sketched the RV-8 as a motorglider. Looked at preliminary stability and control and with minor changes, didn't see any serious problems.

I really hope this is what you are doing! I'm also an aeronautical engineer, and always dreaming. (But getting too old to start a project of this magnitude)

Roger Bloomfield
RV-8 and RV-9A
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  #10  
Old 01-20-2016, 09:08 AM
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Snowflake Snowflake is offline
 
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Location: Victoria, BC, Canada
Posts: 3,227
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Hmm... Tapered wing designed for a Rocket Six should fit on a standard -6 too, shouldn't it?
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Rob Prior
1996 RV-6 "Tweety" C-FRBP (formerly N196RV)
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