Drop Keel Revisited ????

CLS447

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I am rethinking my KB2 project....... I wanted to use the EA81 Subaru engine that wasn't strong enough for my 2 place.
I have everything I need to make it run & it is just sitting there collecting dust. I am just going to polish the frame & powder coat all the brackets.
So I bolted the frame together to see what the engine looks like on the frame. I was going to do a drop keel so the thrust line was good & so
it could spin the 68" Warp drive. The motor mount that I have for it was probably designed to spin a 52-26 2 blade prop ( which I have ). To use the Subaru with the Redrive & Warp prop, I would have to drop that rear keel, 12" !
If I leave the motor right where it is, I would also need a taller mast& longer control rods and so on and so on.......and a longer nose wheel.
I have a nice EA81 with electric start & direct drive prop. I am thinking that I should just put it together with the direct drive setup, & do something
else with the redrive engine (sell it ? )

Doesn't that sound much easier & less expensive ? A classic KB2 powered by Subaru ?

What do you all think ? I will snap some photos today.
 

Roundwing

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Hi Chris,
I have a 2.3:1 psru for that EA81 if interested?
PM me.
Thanks

It sounds like he already has a redrive.

He was wondering about taking the one he has off and going with direct drive.

Rick
 

CLS447

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Thanks for all the feedback....here are those pics .....
 

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GyroRon

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Chris, why bother with direct drive? It will be a dog performance wise. A heavy low performance gyro, loud too. Drop the keel and make a nice machine.
 

CLS447

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What would be the best way to sell it ? With my 7K EA81 ? With the direct drive setup ?
With no engine at all ?

Ron, what size prop would you use if you went with the redrive ?
 

CLS447

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http://www.subarubrat.com/engine.htm

http://www.subarubrat.com/airscooby.htm

I got all the stuff to put together 2 real nice EA81's...... I am definitely gonna build this KB2 with a direct drive setup just so I can use all those pretty parts thjat I have accumulated over the years.

I am going to take some pictures of the stuff I have for the Direct drive engine.

Are there many single place machines out there flying direct drive EA81's ??
 

CLS447

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The wood prop for direct drive use is a Tennessee 52 x 26 . It is supoposed to be a perfect match for the EA 81. If you had the 100 hp EA81, I think they used a 52 x 28.

Does this sound about right ?
 

GyroRon

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something like that. but you end up with a gyro thats a turd to fly, so why bother
 

MadMuz

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The one I got is a 52x44.... I guess the difference is where the pitch measurement is taken? Might be 44" at half blade length and obviously less at the 3/4 distance?

My last one was 55x34 from this same manufacturer (was noisy):violin:
 

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MadMuz

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That prop on your machine is the wrong direction for a sooby direct drive? That one is for VW or rotax direction? Or sooby with a gear box, but then you would want a 68" prop.... Direct drive soobies are anti clockwise when standing in the prop wash
 

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CLS447

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It better be right ! I may have slapped it on there wrong.
 

MadMuz

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Yes, I think you do have it on the wrong way.... whew!

have you tightened it up or is it only on loosely? I ask, because it is easy to wreck them by overtightening them.... I use 'Bellville washers' on wood props. They are a cupped spring washer so the wood can expand and contract with humidity without cracking or having the sandwich plate indent itself into the wood....
 

CLS447

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It was on loosely It is now wrapped back up & on the shelf.
 
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