DA85 on pipe! Results please.

[Jaketab]

	Quote:
	I'm running a 1090 pipe on my Da85 w/ Mej 24x12 3-blade and seeing 8K+ at WOT. I probably need to richen up the top end, but is this normal?

Jim,

I'm looking to quite my 85 from the prop rip. Does the 24x12 rip and cause excess noise at that RPM?

Jaketab

[gapple12]

I was running a Mejzlik 27x10 and it rips pretty good on my 85 with Greves pipe, little loud. Went to a Xoar 26x12 and now its not so loud. Also, picked up some more speed, not that I needed it, and seems to lock into a hover much better.

[pe reivers]

	Quote: Originally Posted by phippsj
	I'm running a 1090 pipe on my Da85 w/ Mej 24x12 3-blade and seeing 8K+ at WOT. I probably need to richen up the top end, but is this normal?

This is not normal. You run your engine at 20 horse power if that is true. Your tach probably got wrong data back to you due to light reflections or wrong blade number setting.
6500 rpm would still be mighty powerful. Less that 6000, and it's a lame duck with that pipe.

[phippsj]

Yep, I think it was a bad tach reading.

[phippsj]

	Quote: Originally Posted by Jaketab
	Jim, I'm looking to quite my 85 from the prop rip. Does the 24x12 rip and cause excess noise at that RPM? Jaketab

I'll let you know when I get it in the air this weekend (weather permitting).

[Jarhead]

can somebody give me some help.Im completly frustrated.Ive had my DA 85 going on three years now its been in twice for bearing issues its costed me two repairs on landing gears because of deadsticks in bad spots.I just got the motor back from DA mounted it back in my plane yesterday.I have MTW can with flex header.Motor is mounted to motor box solid wood no standoffs.Where do i start with my high and low needles I started out at 1 1/2 low 1 1/2 high. where should i be with this setup .Because if i let the engine sit and idle for a minute it wants to try to die then catches itself and goes to full power.But if i throttle up then back to idle let sit at idle for 5 seconds then throttle up it wont bog.It seems to run better when i have the needles at 4 out on low and 3 out on high it still wants to bog out going into the throttle i know this is not right but when i try to lean it out it does not get better it acts like it starves for fuel.Im at a complete loss with engine any help would be thanful.Im running a 27/10 Zoar prop. Thanks

[BoneDoc]

I'm under the impression that DA needs to burble a little bit when on low throttle. Just tune the low end only as lean as it needs to be for a clean transition.

[Jarhead]

is the transistion a moderate moving of stick forward or should i be able to throw stick forward as quick as i can without any hickup

[RadiaLars]

Do you ever while in the air have the need to let it idle for a while and then just flick it to full throttle? No.
While adjusting the low end, move it moderatly fast, but don't jam it open in an instant. It will result in a much nicer tune.

While I agree with BoneDoc in having it on the rich side of clean transition, it is important to lean it all the way until it quits and then richening it up again so you know for sure you have found the right needle position for a good tune.

Lars.

[BoneDoc]

Most that have tried to remove the burble ended up going too lean. That will KILL you in inverted harriers.

I assume that you're using GOOD THROTTLING practice when you're at idle also right (by that, I mean periodically burst the throttle up ever couple of seconds). You CANNOT (in good conscience) let the engine idle for several minutes and not expect any problem.

[Jarhead]

thank you guys for your help as being in gas for only a couple of years i have not had that many problems with my engines.i always assumed that a engine could sit at idle for a period then move stick to full throttle without hesatation.The fisrt part of my problem is that i assumed im going to try this again keeping in mind what you guys said ill let you know the results thanks for your responses.

[phippsj]

Got my DA85 on a KS1090 pipe in the air this last weekend. Tons of power and ran great. However, right above half-throttle there is a point at which the engine goes from low revs to lots of revs. No smooth transition.

Has anyone had any success putting a throttle curve on it so it's not so "peaky"?

[gapple12]

	Quote: Originally Posted by phippsj
	Got my DA85 on a KS1090 pipe in the air this last weekend. Tons of power and ran great. However, right above half-throttle there is a point at which the engine goes from low revs to lots of revs. No smooth transition. Has anyone had any success putting a throttle curve on it so it's not so "peaky"?

That is how most pipes react I believe. That is where the pipe is just kicking in. I have tried many different header combos and that just doesnt go away. Ive learned to fly with it. Oh, Im running the Greves pipe on mine.

[Flatlandman]

You will need a throttle curve that looks like this

You must raise the first part of the curve or it will feel like you have nothing on the first 25% of throttle stick
You can move the flat spot up or down left or right and also make the flat spot shorter or longer to get it on the spot were the pipe comes on

It will make the plane more 3d able.

[airlyons]

Hey there guys...

Hoping to maiden my PAU 36% Edge with DA85 and KS 1090. I did a quick run up and got 6270 rpm on the Mej 28-10. But the needles haven't been adjusted since I was running the 85 with a pits on a different airplane and different prop. I guess I'll first fly it to see how it runs in the air and then tune from there...