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Senior Member
ring Mount on a Model IV?
Has anyone ever put a ring mount on a model IV?
I am going to install a new 80HP Rotax 912 and am considering the advantage or not of the ring mount. Looks like a lot of work and modification and I want to be sure its a good idea.
Any input from experience or guesstamation will be helpful.
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Senior Member
Re: ring Mount on a Model IV?
I put a ring mount on my 1992 version Model IV. My intention was to get the baggage sack capacity I lost when I put all the ribs and fairings on the tail of my first IV. Then I had to placard the baggage sack to max 20 lbs. This time, the empennage was even heavier as I had servo controlled trim on both rudder and elevator plus all the ribs, gap seals and fairings as on the first one. I kept pretty good records on the weights I added with the mods this time and figured it to be about 6.5 lbs. at the eleven foot arm. I calculated about two inches forward on the engine CG would give me what I needed. A significant side benefit was the ability to place the oil tank in a more favorable position vertically.
I think the CG might be the major issue. As my intention was to move the engine forward I didn't consider the geometry of doing it at the same arm especially because my intent also included a repositioning of the oil tank. I should also mention, that my ring mount was 100% home brew.
This shows the right side with the oil tank mount aft and below the exhaust stack
IMG_1033.jpg
The left side with a clear view of the ignition module bracket
IMG_1032.jpg
The ring mount fuselage side.
Engine mount 3.jpg
The isolator set-up
engine mount shock rings.jpg
The custom home brew rubber isolators
Shock mount.jpg
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Re: ring Mount on a Model IV?
I wish I had seen these mods in time.
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Super Moderator
Re: ring Mount on a Model IV?
You're my hero, Lowell…
How much did you have to mod the cowling?
Av8r3400
Kitfox Model IV
The Mangy Fox
912UL 105hp Zipper
YouTube Videos
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Senior Member
Re: ring Mount on a Model IV?
Hero? I see things done by guys - you included - that fit that description, but me, i think i am more addicted to tinkering than anything else. The cowling was an expected project. I added about two inches to the aft edge of the bubble cowl. But the unexpected part was when I fitted the aft cowl and found that the repositioned oil tank interfered near the bottom. My engine was a used engine and the oil tank had some slight denting at the lower edges so I assumed it was made from an annealed stainless steel, so that problem was managed by doing some body work on the lower edge with a hammer. The hammering worked well, but looked really rough, so some micro and a coat of paint took care of that. I probably have the only painted oil tank in the fleet and it was to cover an unintended glitch.
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