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View Poll Results: Rudder it out!
Build it sleek and sexy the way the almighty Vans intended! 9 60.00%
Go big or go home! Think about all the extra aluminum you’ll have down the road! 6 40.00%
Build both and sell me one! 0 0%
Voters: 15. You may not vote on this poll

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  #1  
Old 10-08-2017, 01:18 PM
Ryano Ryano is offline
 
Join Date: Apr 2017
Location: Seattle
Posts: 32
Default RV-7 Rudder.... Does size really matter?

Recently picked up a protozoic and orphaned RV-7 Empennage kit #70101 off eBay.



Subtract out the prototype RV-7 and yes, as confirmed by Vans, I’m the proud owner of the 100th RV-7 kit!

Not sure yet if I’ve gotten myself in over my head, but I’m going to make a go of it. I kind of have to at this point.

#100 has already spent over decade forlorn in a basement! (No fault to the original builder….. They have valid reasons.)

The packing list shows that this kit was shipped with the pre-SB 02-6-1 RV-7/8 rudder.


I’ve searched the forms for all the info available and it looks like the two driving factors for going with, or not going with, the RV-7/9 rudder upgrade are…

1)Better spin recovery as noted in the SB 02-6-1.

2)Negative effects of the larger 7/9 rudder on W&B/C.G..


The big questions at hand are…….

1) Is it worth it to acquire and build the larger rudder?

2)Does Vans still honor the complementary rudder upgrade as noted in SB 02-6-1?

Ready...Set…Go!
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  #2  
Old 10-08-2017, 01:38 PM
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bkervaski bkervaski is offline
 
Join Date: Mar 2017
Location: Birmingham, Alabama
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Default

Quote:
Is it worth it to acquire and build the larger rudder?
The parts won't be that expensive .. it's usually shipping that gets you with large aluminum sheets .. considering it was an SB I would go with the updated assembly.

Edit: Oh, and CONGRATS on your find!
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  #3  
Old 10-08-2017, 02:01 PM
Ryano Ryano is offline
 
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Location: Seattle
Posts: 32
Default

I'm already planning on ordering everything I need to also complete SB 14-01-31, so adding extras is in the plan. Likely one or two extra trim tabs as that seems to be an often reworked item.
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2017 Donation paid...
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  #4  
Old 10-08-2017, 02:07 PM
g zero g zero is offline
 
Join Date: Jun 2007
Location: palm coast fl.
Posts: 945
Default 7 rudder

I would opt for a 8 rudder . The overlap seam is in the front eliminating the double flush rivets on the trailing edge . A few 7's have had tail issues not any 8's that I know of .
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  #5  
Old 10-08-2017, 02:24 PM
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JonJay JonJay is offline
 
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Location: Battleground
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Quote:
Originally Posted by g zero View Post
I would opt for a 8 rudder . The overlap seam is in the front eliminating the double flush rivets on the trailing edge . A few 7's have had tail issues not any 8's that I know of .
A few pilots grossly exceeded VNE. They happen to have been in 7's. Thus far, there is no evidence of any problem with the 7's rudder.
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  #6  
Old 10-08-2017, 04:33 PM
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Captain_John Captain_John is offline
 
Join Date: Jan 2005
Location: KPYM
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Ryan,

A few things...

1) I would vote in the poll but the first response says, "The way Van intended". The only thing is, Van wants you to build and install the newer "9" rudder.

So much so, in fact that there is no charge for you to get the parts from Van if you have an early kit like us!

I have kit #70312.

Get the parts and build either one or both.

2) Either rudder works fine. I still have the "9" (riveted trailing edge) parts new in box and never bothered to build it. I built and installed my "8" (folded trailing edge) rudder and it worked just fine for the past 700 hours. I do mild acro and it is all need. I haven't done any accelerated spins though. Maybe I will build the "9" rudder someday???

3) Also... Be advised... The elevator counterweights on our kits are also different. They weigh slightly more (maybe ounces?) but it's still negligible.

Nice number and enjoy the build!!!

I will let you know if I am ever in your town and take you for a ride in my 7. I get around pretty good in the summer months!

CJ
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  #7  
Old 10-08-2017, 04:50 PM
BillL BillL is offline
 
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Location: Central IL
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Quote:
Originally Posted by Captain_John View Post
Ryan,

A few things...

<snip>

3) Also... Be advised... The elevator counterweights on our kits are also different. They weigh slightly more (maybe ounces?) but it's still negligible.

Nice number and enjoy the build!!!

I will let you know if I am ever in your town and take you for a ride in my 7. I get around pretty good in the summer months!

CJ
I have 70173 and would recommend the updated counterweights on the elevator. It is a real improvement in use of the mass for counterweight. It is just a couple of parts per side. Get an updated drawing (order the thumb drive with all drawings and OP drawings) and it will have the part numbers.
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  #8  
Old 10-08-2017, 05:37 PM
Larco Larco is offline
 
Join Date: Mar 2005
Location: DVT Phoenix
Posts: 914
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Quote:
Originally Posted by BillL View Post
I have 70173 and would recommend the updated counterweights on the elevator. It is a real improvement in use of the mass for counterweight. It is just a couple of parts per side. Get an updated drawing (order the thumb drive with all drawings and OP drawings) and it will have the part numbers.
Also the HS-00001 spar doubler X 1
HS-00005 X 2 ribs
HS-00006 X 2 ribs
will give you the current updated parts for the spar SB. All shown on the newer plans
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  #9  
Old 10-08-2017, 11:50 PM
Ryano Ryano is offline
 
Join Date: Apr 2017
Location: Seattle
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Quote:
Originally Posted by Captain_John View Post
1) I would vote in the poll but the first response says, "The way Van intended". The only thing is, Van wants you to build and install the newer "9" rudder.
I only put that as an option as reading through the SB I came away with the impression that Vans take was "Meh.... improves spin recovery a 1/4 of a turn faster. Do whatever you want.".
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Practice Kit completed 2/19/2017
Tooling up for -7 empennage build.(99.8% tooled 9/16/2017)
Orphaned -7 empennage kit purchased! 9/15/2017
2017 Donation paid...
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  #10  
Old 10-08-2017, 11:53 PM
Ryano Ryano is offline
 
Join Date: Apr 2017
Location: Seattle
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Quote:
Originally Posted by BillL View Post
Get an updated drawing (order the thumb drive with all drawings and OP drawings) and it will have the part numbers.
I have the more modern preview plans and the kit included the OG preview and full size plans to cross reference from.
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Practice Kit completed 2/19/2017
Tooling up for -7 empennage build.(99.8% tooled 9/16/2017)
Orphaned -7 empennage kit purchased! 9/15/2017
2017 Donation paid...
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