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  #1  
Old 09-15-2022, 09:16 AM
Inspector Scott Inspector Scott is offline
 
Join Date: Dec 2021
Location: SW fl
Posts: 10
Default swap from a 7 to a 7A

quick question Id like to throw out there.
I'm purchasing a Q-build 7 fuse and wanted to get some feedback about changing it to a (A) model tricycle gear set up.
first off is it doable and second approximate cost.
thanks in advance
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  #2  
Old 09-15-2022, 09:36 AM
Bavafa Bavafa is offline
 
Join Date: Oct 2007
Location: Sacramento, CA
Posts: 4,002
Default

Certainly doable and if memory serves me right, very little to change.
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N825SM RV7A - IO360M1B - SOLD
N825MS RV14A - IO390 - SOLD
N258SM RV14A - IO390EXP119 - Out of Paint shop & flying
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  #3  
Old 09-15-2022, 01:11 PM
keitht keitht is offline
 
Join Date: Jun 2016
Location: coupeville wa
Posts: 237
Default 7 to 7A

Some years ago I bought a project that was at close to quickbuild stage with a slider canopy and 7A gear and did all the research to convert from slider to tip up and 7A to 7 (going the other way to what you plan). The differences are managable.
Engine mount frame - replace with 7A engine mount and sell the 7 engine mount.
Purchase 7A engine mount, nose gear leg, wheel,wheel pant and fairings.
The cockpit forward spar and gear covers are also different.
Gear leg fittings - purchase.
Gear legs check for toe in toe out - the 7A has toe in - I seem to remember the 7 has toe out. Depending on the configuration of the gear legs in your kit it may be possible to reconfigure them to work for the 7A - important to confirm.
Add the rear tiedown plate if not installed.
I chose to leave the gear as a 7A but did make the change to a tip up. There were all kinds of subtle differences that required new parts and modifications in addition to the obviously different parts - in some cases off by less than 1/4 inch where rivet holes just wouldnít line up and parts had to be remade or modified so be prepared for that. Needless to say I thought I had done a pretty good planning job but there was a number of things I didnít see coming. I think in the end the changes cost about $1500 even though the canopy lexan was not cut and fully repurposed for the tip up canopy.
I am sure others will tell you also that going off from (Vans) plan gets into uncharted waters pretty quickly.

KT
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  #4  
Old 09-15-2022, 02:24 PM
Inspector Scott Inspector Scott is offline
 
Join Date: Dec 2021
Location: SW fl
Posts: 10
Default

thanks for the feedback I appreciate it
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  #5  
Old 09-15-2022, 05:01 PM
jarvis jarvis is offline
 
Join Date: Jul 2005
Location: lexington, KY
Posts: 361
Default Have most everything you needÖ

Öif you want to swap. Check your PMís.
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Jarvis
Purchased flying RV-7A
RV-7A emp finished, wings finished.
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  #6  
Old 09-15-2022, 07:00 PM
meloosifah meloosifah is offline
 
Join Date: Jul 2009
Location: Indiana
Posts: 323
Default

I swapped in the opposite direction. I can tell you, you will add a bundle of money unless you can find someone to swap or give you a deal. The engine mount is pricey and the missing parts for the nose gear and weldments are not cheap. Itís about $1000 in additional cost when ordering, but more like $3500 to buy all the parts new.

As to difficulty, itís really not that much work if itís at quick build stage.
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  #7  
Old 09-15-2022, 08:03 PM
rockwoodrv9 rockwoodrv9 is offline
 
Join Date: Dec 2011
Location: Meridian ID, Aspen CO, Okemos MI
Posts: 3,140
Default Get the new Motor Mount - Nose Gear

I made the same change in my 9A. Since the new nose gear mount is available I would strongly suggest you get it for the change. It will be worth the cost in both safety and resale. Look at the 10 and 14 nose wheels and you will understand.

One thing I did not do was remove the tail wheel receiver inside the back fuselage. It probably cost me a few pounds at the worst place but my CG is still good as long as I dont go to heavy in baggage. It is fun to slip the tail wheel on to see the looks on peoples faces when they are looking at your plane.

There are a few tricky parts but it goes pretty easy and if you want a nose gear plane, worth it. I am happy with mine.
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  #8  
Old 09-15-2022, 08:12 PM
Bavafa Bavafa is offline
 
Join Date: Oct 2007
Location: Sacramento, CA
Posts: 4,002
Default

The OP question is about the QB fues, there is no indication the finishing kit is included in his purchase which makes all the fear of extra cost just a moot point.
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N825SM RV7A - IO360M1B - SOLD
N825MS RV14A - IO390 - SOLD
N258SM RV14A - IO390EXP119 - Out of Paint shop & flying
Dues paid
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  #9  
Old 09-15-2022, 08:50 PM
wirejock's Avatar
wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 5,489
Default Inventory

Quote:
Originally Posted by Inspector Scott View Post
quick question Id like to throw out there.
I'm purchasing a Q-build 7 fuse and wanted to get some feedback about changing it to a (A) model tricycle gear set up.
first off is it doable and second approximate cost.
thanks in advance
If it helps. Check my blog (below) for "Basic Excel Builder Log". One of the tabs is a full 7A inventory plus a lot of the 7 inventory. It's arranged as received from shipping lists.
I second using the new elastomeric nose gear engine mount.
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Estes Park, CO
E-mail: wirejock at yahoo dot com
Builder Blog: http://wirejockrv7a.blogspot.com
Donated 12/01/2021, plus a little extra.
RV-7A #73391, N511RV reserved
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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  #10  
Old 09-15-2022, 09:44 PM
sahrens's Avatar
sahrens sahrens is offline
 
Join Date: Jan 2007
Location: Battle Ground
Posts: 574
Default Changes

Quote:
Originally Posted by Inspector Scott View Post
quick question Id like to throw out there.
I'm purchasing a Q-build 7 fuse and wanted to get some feedback about changing it to a (A) model tricycle gear set up.
first off is it doable and second approximate cost.
thanks in advance
Here are the things I believe you will need / want to change.

The TW mount could be removed, a fair number of rivets to drill out and reset. Cannot really install the aft tie down with the TW mount installed.

The step installation will require removing the baggage compartment flooring so you can drill and install it. I believe the step kits are 170.00 each.

I am pretty certain the existing gear legs won’t work with the engine mount for a A model. The gear legs are 310 a piece and the gear leg mounts are 330 a piece. So a bit over 1200.00 for the gear. I sent you a PM about this.

It’s all doable if you are comfortable with drilling out rivets successfully. There are also gear mount holes that will have to be cut in the cabin floor. If you have the builder’s manual you can read through the build steps for a slow build fuselage and determine where and what needs changing.
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RV-7 N818BG (flying)
Bearhawk Patrol (building)
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Last edited by sahrens : 09-16-2022 at 08:45 AM.
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