Aeroovee to Rotax mount conversion???

[Bryan Cotton]

Aluminum washers to contain the rubber dampers... Made the bad way with a 60mm cup saw that gives me 56mm washers...

The bad way! No way! I've made a lot of washers with a cup saw, or holesaw as we call them over here.

Looks great!

[Kai]

Yup!

It is just a question of measuring the inner diameter of the coleslaw- sorry: hole saw, and add perhaps a mm or two. That is the washer diameter you will need. You need to make sure that the washer covers ALL of the rubber damper surface. If not you may be sure that the washer will start to dig into the rubber.

Don´t ask how I found out.

[xeriotti]

Yup!

It is just a question of measuring the inner diameter of the coleslaw- sorry: hole saw, and add perhaps a mm or two. That is the washer diameter you will need. You need to make sure that the washer covers ALL of the rubber damper surface. If not you may be sure that the washer will start to dig into the rubber.

Don´t ask how I found out.

jajajajaja Ive learned lots of stuff that people shouldnt ask how i did!!! XD

Listen.... Anyone know how is the engine oriented in Rotax equipped Sonex/Waiex? How much compensation for p-factor and attitude This one ended straight ahead (0 de grees laterally) ....and 1.8 de degrees pointed down..

[Kai]

Well,

My guess is purely speculative: nothing at all- straight as a ramrod.

Certainly no angular deviation from the 3 main axis centerlines- especially nothing ´nose down´. The reason is the overly effective barn door flap which tends to stand the plane on its nose on final: there is not enough trim authority to compensate, and you need additional help from the elevator. With a little down angle on the prop and the engine on anything more than low idle, this would certainly aggrevate the situation.

The ones we do up here are all oriented with the prop flange in the same planes as the Jab 33A. Longitudinally this is easier said than done- a lot depends on what dimensions the original engine mount has.

Should the installation check reveal any deviations, this is adjusted with washers.

Thx

[xeriotti]

And what angle are Aerovees and Jabs pointed???

Im thinking about test flying it...before fitting the cowling... That way if theres any correction to be made i can modify the cowling to perfectly line to the prop cone.

[13brv3]

I wouldn't angle the engine up or down, but I'd certainly allow for some right offset to compensate for the left turning thrust. I left mine straight, and there's a pretty big change in yaw when you add or reduce power. At some point, I'll shim the engine to the right, though I have no clue how much would be needed.

Rusty

[xeriotti]

I wouldn't angle the engine up or down, but I'd certainly allow for some right offset to compensate for the left turning thrust. I left mine straight, and there's a pretty big change in yaw when you add or reduce power. At some point, I'll shim the engine to the right, though I have no clue how much would be needed.

Rusty

What the manual says about engine angle? In other aircraft its usually 2 degrees pointing down and maybe 1 or two compensating p-factor....

What are you guys using and what are your results?

[Skippydiesel]

I am sure that I have seen this debate elsewhere - the result "fence sitting" ie about equal numbers for/against, with neither side bringing a scientific/researched/tested argument to sway the reader in either direction.

[xeriotti]

I am sure that I have seen this debate elsewhere - the result "fence sitting" ie about equal numbers for/against, with neither side bringing a scientific/researched/tested argument to sway the reader in either direction.

Im flying it without cowling....If it flies striaight and has no weird tendencies when applying or substracting throttle im leaving it as it is and proceed with the cowling.... Unless someone changes my mind along the way XD

[xeriotti]

And some updates... Im rtying to solve my firewall forward. So im starting with what i think are the easier items...

Im fitting a 22ah Gel-AGM Battery... It will be held in place with this box and backplate (firewall is so thin.. the backplate will have welded nuts on it and will be ribeted in place from the inside) The box will be held in place via 5 M6 screws. Aint going nowhere.


And this is my 30 degree oil reservoir mount for the firewall... Also has a reinforcement backplate for the firewall


No aluminum available fast, esasy and cheap.... So im going for stainless if available, otherwise...mild steel and then powdercoating.

Up next I will try to solve the exhaust system... Id love to make a 4 to 1 happen.... Sounds beautifuly disturbing and im sure there is some performance gain in there..