DA85 on pipe! Results please.

[sprice50]

	Quote: Originally Posted by Royster
	Does your plane shake like a bugger as well on idle?

It does shake more on idle than my twin did. Elevators noticeably shake even with 5955s. Glad I have titanium gears .

[sprice50]

	Quote: Originally Posted by Patrick H
	At idle the torque twist becomes more pronounced. This can be easily mistaken for vibration.

Yes, agreed and with a 28x10 mej on pipes vs a 27x10th on stock muffs even much more so.

[sprice50]

	Quote: Originally Posted by RustyTumbles
	What length header you running now (with the 28x10 setup)?

Just using the stock DA double bend flex header with 1/2" gap between header and pipe. I used the KS comfort-mount in the recommended location.

[sprice50]

	Quote: Originally Posted by Reza
	Next time you get to fly your 28x10,tach it before take off and also tach it after landing. See how much drop you have before and after the flight! Please let me know when you get a chance. I have a 27x10 and 27x10th to test. If I find a 28x10 around I will give it try as well but I really doubt it. I haven't seen anyone around me with 28x10, I keep an eye out!

Guys,

Can someone with a broken in KS1090 setup perform static rpm test on a 27x10 and 26x12 Mej? I don't have these props and would like to compare to the MTW RE3 results.

[Royster]

	Quote: Originally Posted by sprice50
	I think in order of noise from least to loudest (also power): Greeves RE3 KS1090 The pipe setups are way more potent than the stock muffs, so although they are quieter for a given RPM in my opinion, the increased RPM negates this considerably. I think the KS1090 is the same noise level as a stock muffler. For a quiet setup the 3 blade would really help. When you are getting over 6600 on 28x10 mej on the ground, it sure is loud in the air. KS1090 tends to peak in noise over 80% throttle... 28x10 rips on demand. I'd just run it with a 25x12 3 blade. Also, you can just limit the throttle by adjusting endpoint to say 80%. For an idea of power, I run a curve on my throttle and at 50% throttle only 1/3 carb open and 75% throttle stick carb is 50% open. With this setup and 25-26lb 35% AW 260, I have unlimited vert at 70% and noticeable acceleration when going to full power. just watch my video in my signature. That was the setups 6th run! I run 1 turn low needle, 1.5 turns high and it is so potent, reliable, and smooth transition I don't bother messing with it. There is no noticeable 'coming on pipe'. Also with my curve the throttle is nice and soft from 30% - 50% for torque rolls and rolling harriers etc. For kicks I am going to experiment this year with Xoar 28x12 and cut down to achieve around 6000 on the ground. I predict a 27x12 will do this. I want a prop that is quieter, with higher speend range than my Mej... we will see.

Congrats on the baby!

I gather that setup would only work where you live? (as far sea level)

After talking to our guys here in Australia that went to the TAS 2008 they had power loss and had to go to bigger and louder props.

This year IMAC in Oz we will loose points for props that rip and pitts mufflers that bark loudly!
Pretty sure most of us down here who have the DA85 use a 2 blade Mej 27x 10 (not the thin) a friend is using a 3 blade on his CARF260 with a tuned pipe and as he wants to slow the plane on downlines.

[sprice50]

	Quote: Originally Posted by Royster
	Congrats on the baby! I gather that setup would only work where you live? (as far sea level) After talking to our guys here in Australia that went to the TAS 2008 they had power loss and had to go to bigger and louder props. This year IMAC in Oz we will loose points for props that rip and pitts mufflers that bark loudly! Pretty sure most of us down here who have the DA85 use a 2 blade Mej 27x 10 (not the thin) a friend is using a 3 blade on his CARF260 with a tuned pipe and as he wants to slow the plane on downlines.

A 27x10 Mej would be even louder than the 28x10 surely as the RPM would increase a bit I would think. Perhaps this is neglated by the decreased diameter.

[RustyTumbles]

If on a pipe the 27x10 would be to small. They say that the 27x10 and 28x10 have the same static load but the 27x10 would unload alot more in the air which would increase noise due to the increase in RPM.

I'm running a 27x10 with a KS95 canister and it seems about right. While the prop unloads in the air it is not excessively noisey. I think the motor will turn a 28x10 at around the same figures as the 27x10 on the ground but I think the in flight performance will suffer.

[nick05]

	Quote: Originally Posted by gene6029
	Nick, im very interested in how your yak flies with the 85. I fly mine with the DA-100 on MTW-75 cans and wish it had more oomph sometimes. Im in the process of lightening it with li-ions & carbon wing tubes etc. I use it for IMAC only....Gene

he gene, heres a quick vid of the maiden, way under propped and a very rich mid range, all was sorted for the next flight.

YouTube - DA-85 yak55sp Maiden

&feature=channel_page
the DA-85 was very impressive on the mtw re3 tuned pipe and threw the plane around with unlimited vertical, the 26x10 is defo too small, spool up time was instant and power was stupid and ripped at 2/3 throttle, bolted on a 28x10 and things are a lot more comfortable but still rips, obviously quietens down a tad when prop is under load, thinking 27x12 or 28x12 to shut her up a bit, will try later.....
AUW is around 24/25 lb so wing loading on this baby is a different kettle of fish than the 100cc and is rock solid in the harrier,
snaps are very crisp and stops instantly exactly where you want it to, 4 point rolls are a breeze and rolling circuits are smoooooooth. shes a 3d monster

was very wrapped up on getting the whole plane dialled in so unfortunately no tach results yet, watch this space........

[matus777]

	Quote: Originally Posted by nick05
	he gene, heres a quick vid of the maiden, way under propped and a very rich mid range, all was sorted for the next flight. nfortunately no tach results yet, watch this space........

What did you do/adjust to get it all sorted out? Was it adjusting the carb needles or other?

[Royster]

Also how bad is the vibration. I bought a C-ARF but not sure if the 85 will in time damage the airframe?

[gene6029]

Nick05, thanks for the vid, looking good! Royster, i had my 85 in a 2.3 extra compy this past season & the only issues i had was that i kept tearing the holes out where the cowl bolts go thru in the cowling. I finally used 1/4 20 plastic bolts with hardwood tapped & that fixed that. No other issues with wear on the airframe due to vibration. Just reading these posts has got me really interested in trying a pipe on mine this year. There is not enough room inside for a can, so im hopeing the pipe will fit. Good information on this thread.....Gene

[nick05]

	Quote: Originally Posted by matus777
	What did you do/adjust to get it all sorted out? Was it adjusting the carb needles or other?

ya just needed 3/4 turn bottom end and about 1/8 turn top end ( lean ) and shes singing sweet, left it a tad rich top end as still running in, also now fitted 28x10 menz prop which is ideal a bit noisy but that will change once i got enough money to get a mejzlik....

[nick05]

	Quote: Originally Posted by Royster
	Also how bad is the vibration. I bought a C-ARF but not sure if the 85 will in time damage the airframe?

i bolted mine straight onto sheet of 6mm ply as DA recommends which has the stand-offs behind that and i can honestly say the airframe doesnt suffer any vibrations at all..

[matus777]

	Quote: Originally Posted by nick05
	ya just needed 3/4 turn bottom end and about 1/8 turn top end ( lean ) and shes singing sweet, left it a tad rich top end as still running in, also now fitted 28x10 menz prop which is ideal a bit noisy but that will change once i got enough money to get a mejzlik....

Thanks....pipe stayed as installed then.....thanks for posting!

[Royster]

Thanks Nick and Gene, I feel more confident in using the 85 in composite airframe

I was going to buy a DA100 for the comp-arf but since I already have the 85 in a Wild Hare Sukhoi I could save some serious bucks and continue to use the DA85 as I say to everyone I have no issues with power, it pulls hard!

Has anyone tried a 3 blade Mej prop on the DA85?