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11-01-2010, 07:22 AM
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Join Date: Nov 2010
Location: Chicago
Posts: 19
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80HP Rotax in a RV-12
Could I use my 10 year old 80HP 912, 155 hrs. TT in a new RV-12 (ELSA)? If so what could I expect in performance losses specifically rate of climb and top speed?
Any other problems I am not considering?
If I chose to go to the 100hp. How much could I sell my 80hp version for assuming I have an authorized repair tech. go through it?
This is my very first post on this forum so please forgive and direct me if I should have posted this elsewhere.
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11-01-2010, 07:33 AM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,768
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If you build ELSA, you may not deviate from the plans in any way. You must purchase an engine from Van's to receive the Form 8130-15.
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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11-01-2010, 08:35 AM
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Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,070
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E-AB registration required
awilson,
If you do not buy every single part from Van's and do not build it exactly like they say with absolutely no modifications, then your only option is to register it as Experimental - Amateur Built, NOT E-LSA. However, you can still fly it as a sport pilot as long as the plane still meets the definition of LSA.
As far as performance with an 80HP engine, no one knows because it has not been done yet. You will save money by using your engine, but not as much as you think because you will have to buy all of the firewall forward components (minus the engine). You might not be happy with the 80HP performance. Even if the performance is satisfactory, your plane will be harder to sell some day because it has been modified and because a new owner will not be able to obtain a repairman's certificate.
Joe
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11-01-2010, 09:37 AM
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Join Date: Mar 2008
Location: Texas
Posts: 1,378
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Quote:
Originally Posted by awilson
Could I use my 10 year old 80HP 912, 155 hrs. TT in a new RV-12 (ELSA)? If so what could I expect in performance losses specifically rate of climb and top speed?
Any other problems I am not considering?
If I chose to go to the 100hp. How much could I sell my 80hp version for assuming I have an authorized repair tech. go through it?
This is my very first post on this forum so please forgive and direct me if I should have posted this elsewhere.
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Now that the RV12 has been certified by the Feds as a 51% you can go EAB and use your 912. In terms of power you could easily turbocharge it through BullyHawk into a 914 and pay way less than buying a new 100HP Rotax. Now what that does to front end weight I'm not sure. You would have to be careful to calculate the new CG etc but I'm guessing it would work. You would not have a problem with the LSA class because the 914 won't go any faster but it will certainly climb better and you will come out a lot cheaper than trying sell yours and buy a new one.
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11-01-2010, 09:48 AM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
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Welcome to VAF!!!!
Quote:
Originally Posted by awilson
This is my very first post on this forum----
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Alan, welcome to VAF.
You came to the right place to get your RV questions answered, that is for sure.
As to selling the 80 hp engine, the Kitfox and various Monet designs would be a good market to look into. I suspect Google will help find sites dedicated to them.
__________________
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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11-01-2010, 11:41 AM
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Join Date: Jun 2007
Location: Perth, Scotland
Posts: 494
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Firewall Forward Stuff
Not sure I agree with Joe's comment about firewall-forward. Vans provided me with a complete firewall forward kit, less the engine. I needed to buy the assessories that Vans buy and include with the engine - radiators and coolant bottle etc. And I had to buy metric to imperial adapters. Not EAB-build, obviously.
Cheers...Keith
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11-01-2010, 12:53 PM
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Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,070
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how much he can expect to save
Hi Keith,
I did not mean to imply that Van's would not sell the firewall forward kit, only that awilson needed to buy those items at cost higher than expected. Since you went that route, perhaps you can tell awilson how much he can expect to save by using his engine. That might help him decide what to do.
Joe
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11-01-2010, 12:56 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by gblwy
Not sure I agree with Joe's comment about firewall-forward. Vans provided me with a complete firewall forward kit, less the engine.
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Because you live in Scotland. You do not have an E-LSA certification category.
In the US, all parts must be purchased from Van's to qualify for E-LSA.
As far as an RV-12 with an 80 HP 912?
I think you would have speed and climb performance about the equivalent of a Cessna 150 (which you could buy for a lot less money), with the handling qualities of an RV-12.
__________________
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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11-05-2010, 06:45 AM
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Join Date: Nov 2010
Location: Chicago
Posts: 19
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Thanks for the comment. I generally agree. You either do it or you don't. So if I move forward I will use the 100 HP Rotax.
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11-05-2010, 06:48 AM
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Join Date: Feb 2005
Location: Huskerland, USA
Posts: 5,862
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There is a heck of a market for used Rotax 80 HP.
Good luck and welcome to VAF!
__________________
RV-7 : In the hangar
RV-10 : In the hangar
RV-12 : Built and sold
RV-44 : 4 place helicopter on order.
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