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  #1  
Old 07-29-2019, 05:31 PM
dsm8 dsm8 is offline
 
Join Date: Oct 2006
Location: Madison CT
Posts: 57
Smile Aeromomentum

Good Evening RV-12ers:

While watching videos of Oshkosh saw an aeromeomentum video and RV-12 FWF kit. Although I love the concept of experimental/amateur built category advantages, the reliability of the Rotax 912 ULS cannot be discounted. I am always open to considering alternative options. Any one with experience with aeromeomentum engines or alternatives, I am willing to consider. I know there are strong opinions out there and do not want to get into a "primer war", just would like to hear about anyone's regrets or successes

Have a great evening
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Don "Donnie Mac" MacMillan
RV-12 12808
Finish kit 80% done 80% to go
donald.macmillan@ynhh.org
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  #2  
Old 07-29-2019, 08:50 PM
Piper J3's Avatar
Piper J3 Piper J3 is online now
 
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 1,490
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464TT on RV-12 with 912ULS with zero problems or safety concerns...
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Jim Stricker
Hinckley, Ohio (1OA2)
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
RV-12 E-LSA #120058 AWC July 2012 N633CM
RV-12 Bought Flying Oct 2015 with 48TT - Hobbs now 490

LSRM-A Certificate 2016
Special Thanks... EJ Trucks - Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - 1st Lt. Captain B-17H
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  #3  
Old 07-30-2019, 03:30 AM
blythet blythet is offline
 
Join Date: Sep 2011
Location: selma, NC
Posts: 13
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Same here. 450+ troublefree hours with original carb floats! I flew a Skyhawks with a O300D Contienental for 31 years before building my RV12. I have the same confidence in the 912ULS I had with the O300D!
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  #4  
Old 07-30-2019, 04:50 AM
rongawer rongawer is offline
 
Join Date: Dec 2007
Location: Brentwood, CA
Posts: 505
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I had a great time at Oshkosh and was able to spend a little time at the AeroMomentum booth with both Mark Kettering, owner, and Dick Gossen- who has an AM15 on his RV12.

Dick is the best resource for this engine on a 12; he is very happy with the setup, it is performing well for him, is fuel efficient and a fraction of the cost in comparison to a Rotax.

I took a bunch of photos, but posting them here is a hassle, so suffice it to say the quality of work is very good. One thing to note is that Mark is an actual engineer who designed his gear boxes with actual good engineering practices and stress analysis (as opposed to another “entrepreneur” selling gearbox packages that look shiny).

Mark claims he has several gearboxes with 4000 to 5000 hours on them running on airboats, so reliability appears good
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Ron Gawer

- RV10, Build in progress.
- RV12, N975G, "The Commuter"
- Several others that are now just great memories for me.

Last edited by rongawer : 07-30-2019 at 11:30 PM.
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  #5  
Old 08-01-2019, 02:00 PM
rongawer rongawer is offline
 
Join Date: Dec 2007
Location: Brentwood, CA
Posts: 505
Default More info

Hey, I found this video https://youtu.be/8mMBxwFrwK4 from Homebuilt Help. It goes into the engine. I have a UL Power engine, but this one is pretty cool too.
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Ron Gawer

- RV10, Build in progress.
- RV12, N975G, "The Commuter"
- Several others that are now just great memories for me.
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  #6  
Old 08-01-2019, 03:30 PM
joe gremlin's Avatar
joe gremlin joe gremlin is offline
 
Join Date: Sep 2005
Location: Southwest Michigan
Posts: 149
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Quote:
Originally Posted by rongawer View Post
Hey, I found this video https://youtu.be/8mMBxwFrwK4 from Homebuilt Help. It goes into the engine. I have a UL Power engine, but this one is pretty cool too.
@ 5:29 - "I can do that (climb rate) all the way to 1500ft with me and full gas and 50lbs of bags, almost gross."

That's impressive performance but it seems like it turns the 12 into a 1-person airplane.
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RV-12 Empennage
Fuse kit in box
Need a wing kit
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  #7  
Old 08-01-2019, 07:42 PM
12vaitor 12vaitor is offline
 
Join Date: Aug 2012
Location: Panama City, FL
Posts: 124
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What would be helpful is for alternative FWF vendors to publishing some real numbers for weight and balance for their alternative engines in RV-12s. An engine weight increase of 40 pounds does not sound like much, however it is all over the nose wheel. Its not hard to be near the FWD CG limit at low fuel with a single pilot.

In my case, I was not happy with the forward CG situation and ended up moving both batteries and the dual fuel pumps to the tailcone. It was interesting to see Van's dual fuel pump mounting location in the 12is is also in the tailcone area.

If you do not like building, designing, and fabrication work I would recommend staying away from alternative engines, its a lot of time and work to do it right. In my case, I estimate it added at least two years to the build time.

John Salak
RV-12 N896HS
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  #8  
Old 08-01-2019, 08:09 PM
redbaron redbaron is offline
 
Join Date: Aug 2013
Location: Lucerne,Ca
Posts: 267
Default Weight decrease from batteries

I have installed 2 EarthX batteries to off set the increased engine wt.
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  #9  
Old 08-02-2019, 09:17 AM
rongawer rongawer is offline
 
Join Date: Dec 2007
Location: Brentwood, CA
Posts: 505
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I just went to Oshkosh with my brother and 85 pounds of baggage with 22 gallons of fuel: at that weight, I see 1100 fpm at Sea Level, but I climbed out of Bozeman, MT at a 11,900 DA at 600 fpm. I was pretty happy with that.

With 15 gallons of fuel and solo, I can see initial rates of 1700', and climb to 8500' in ~7 minutes from take off from SL, so his numbers are reasonable.
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Ron Gawer

- RV10, Build in progress.
- RV12, N975G, "The Commuter"
- Several others that are now just great memories for me.
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  #10  
Old 08-02-2019, 09:51 AM
seward747 seward747 is offline
 
Join Date: Jan 2005
Posts: 173
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rongawer: just to clarify your above post, you're running which engine?


Doug in Seattle
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