H9 35% Extra 260 w/DA 85

[forgues research]

	Quote: Originally Posted by bodywerks
	your only major concern is properly mounting it! You cannot use standoffs on the DA-85 - it will void the warranty. With the H9 260, the engine is spaced out so dang far, too, so making a mounting block out of solid ply would add a lot of weight. I have had good luck with end-grain balsa blocks, capped with two sheets of 1/32" ply(compression-glued), on engines up to 150cc - it may be an option. Given how far out this setup is, though, I would consider making a sort of pyramid with the top chopped off out of the end-grain balsa, cap the front as mentioned before, then glass the whole thing with 3/4oz glass (except the back part - you'll need to glue the assembly to the existing firewall). Weight gain would be minimal, strength would be phenominal.

WOW no standoffs for the DA 85, can you tell me why that is, I know you said it would void the warranty but why would this be, this is ridiculous ....

Roger

[Vic3D]

	Quote: Originally Posted by forgues research
	WOW no standoffs for the DA 85, can you tell me why that is, I know you said it would void the warranty but why would this be, this is ridiculous .... Roger

Maybe the backplate is weak.

[luv2flyguy]

Here's why they say not to use stand-offs on a DA-85, IMHO most guys do not have access to the right tools to get all four stand-offs the exact same lenght, I'm talking about within a couple of thousands of an inch. The back plate must stay within that tolerence or it could cause stress on the crankcase when mounted. If mounted uneven it's only a matter of time before something comes apart in the engine. The only way to solve the problem is to mount the engine on a flat surface such a Bodywerks is talking about, you may say well I can buy stand-offs all the same lenght, true but when tightening them down you must have the exact same torque on them or you will still have an uneven surface. This is just my opinion why they say not to mount the engine on stand-offs. Hope this helps or even makes any sense. I think I've confused myself!

[forgues research]

	Quote: Originally Posted by luv2flyguy
	Here's why they say not to use stand-offs on a DA-85, IMHO most guys do not have access to the right tools to get all four stand-offs the exact same lenght, I'm talking about within a couple of thousands of an inch. The back plate must stay within that tolerence or it could cause stress on the crankcase when mounted. If mounted uneven it's only a matter of time before something comes apart in the engine. The only way to solve the problem is to mount the engine on a flat surface such a Bodywerks is talking about, you may say well I can buy stand-offs all the same lenght, true but when tightening them down you must have the exact same torque on them or you will still have an uneven surface. This is just my opinion why they say not to mount the engine on stand-offs. Hope this helps or even makes any sense. I think I've confused myself!

Horse cockey when tightening the engine to the plywood firewall, just the compression of the wood with uneven tightening, will compress much more then a few thousand ...

Roger

[MR G]

Hey Roger, I think that's Horse Hockey not horse cocky.

Either way, I agree with you, the wood would compress far more than a few thousanths.
The real reason not to use standoffs on the DA-85 is to prevent any twisting to the backplate of the engine wich may crack the housing. That is IMHO anyway.

MR G

[forgues research]

	Quote: Originally Posted by MR G
	Hey Roger, I think that's Horse Hockey not horse cocky. Either way, I agree with you, the wood would compress far more than a few thousanths. The real reason not to use standoffs on the DA-85 is to prevent any twisting to the backplate of the engine wich may crack the housing. That is IMHO anyway. MR G

OOOOOPPPPS

[luv2flyguy]

Roger- In all actually that's what I meant, the back plate would twist and cause stress on the crankcase. I'm sorry that you don't think that I know what I'm talking about, it was just an opinion. I work in the industry, I work for Hendrick Motorsports in the engine dept. here. Also do a little CNC machining here also, (5 axias) in the engine dept. We have all Haas equipment, use USG Ideals but converting to NX more universal for our applications. Sorry you "misunderstood" me.

If you're ever in the area come by and I'll give you a tour!

[Mark Davis]

FWIW, I've had #2 of the H9 260's and used the supplied standoffs on both... I've never had an issue in 150+ flights... I sold my last 260 a few months ago and the new owner continues to fly it without issue...

[forgues research]

	Quote: Originally Posted by luv2flyguy
	Roger- In all actually that's what I meant, the back plate would twist and cause stress on the crankcase. I'm sorry that you don't think that I know what I'm talking about, it was just an opinion. I work in the industry, I work for Hendrick Motorsports in the engine dept. here. Also do a little CNC machining here also, (5 axias) in the engine dept. We have all Haas equipment, use USG Ideals but converting to NX more universal for our applications. Sorry you "misunderstood" me. If you're ever in the area come by and I'll give you a tour!

I would love to visit
Thanks
Roger

[Extra nuts]

	Quote: Originally Posted by MR G
	Hey Roger, I think that's Horse Hockey not horse cocky. Either way, I agree with you, the wood would compress far more than a few thousanths. The real reason not to use standoffs on the DA-85 is to prevent any twisting to the backplate of the engine wich may crack the housing. That is IMHO anyway. MR G

LOL, I call it Horse Puckey?? Not pickin at words just laughin along.

[sprice50]

Go with the KS1090. It is bullet proof stock setup with great transition, unreal power, and is not finicky at all.

http://www.flyinggiants.com/forums/f...please-20.html

A little windy, but there are some good climbouts showing the setup's power.

YouTube - 35% AW 260 - testing DA85 / KS1090 pipe...

[bodywerks]

Shaun, that is hilarious! The power is SICK! And to think, I put the same engine on its 21 pound little brother

[sprice50]

That was less than 2 gallons through the motor on non-synth. You never should have sold your 85 Nic

[luv2flyguy]

That's awesome! I've thought about this, but there's still something about looking into the cowl and seeing two cylinders being that I'm an engine guy. I guess there's something even more when you seen 5 one hunderd dollar bills in your wallet!!!

[scalefreak]

WOW! That thing has got some pony's! That's a nice, clean lookin' install, BodyWerks. I like it.