Da-85 - Actual Field Results

[krayzc]

Tom,

thanks for your testing and future testing it sure makes it much simplier on us to just use the wheel that is already invented vise having to get that lump of rock and carve out an idea.

[bodywerks]

	Quote: Originally Posted by wildhare
	Here's a quick update. I spoke to Bill at DA today and toldhim about my setup and results. He told me that their experience shows another 200 rpm can be gained by using the KS 95-4 rear outlet muffler over the MTW TD110K that I was using, so I ordered one to test. I also ordered a Mejzlik 27-10TH which he said is the prop of choice. I will re-run my tests when I get the new stuff. Stay tuned. TF

It won't hurt to run that prop on the hundred, either, for a really good comparison - which answers someone's question about bolt patterns...YES, they are the same.
I am surprised those wood props bog this engine down so much. I try to stay away from wood props for other reasons, but that is just another reason, too, I guess. According to DA, a standard Mejz 27X10 on stock muffs turns at 6320 at their shop, which is around 2800 feet. I suspect the TH prop will turn about 150 more R's. I would like to see what this baby turns a standard mejz 27"er when on a pipe - my 100 on pipes is at 6670 with only one gallon through it...

[wildhare]

Keep in mind that my results may not be totally accurate on an absolute scale. I was using a H9 optical tach which may or may not be correct, but it's good for a comparison of the two engines.

The DA-100 hauls a 28 pound plane with authority which is all I require from it, I don't really care what the actual rpm is as long as it works for my application and it's reliable.

TF

[RustyTumbles]

	Quote: Originally Posted by bodywerks
	I would like to see what this baby turns a standard mejz 27"er when on a pipe - my 100 on pipes is at 6670 with only one gallon through it...

Ian Howard from DA Australia had the prototype here earlier in the year. It was in a Comp-arf 2.6m 260 and on a pipe. It was turning a 28x10 mej at 6600rpm.

Also the static load between the 27 and 28 x10 Mejzlik's are almost the same, but the 27x10 will unload more in the air.

[dick hanson]

sounds very plausible -I found on my 80 Super ZDZ the same numbers -for a very smooth non peaky setup (7200 in level flight-engine has a tattletale tach))
actually as my plane is small ( H9EDGE)- the thing is underpropped for cruising around but "good for instant response/speed changes etc..
I am sure one can get more peak power - but the engine will likely get uneven in midrange running
overpropping with pipes sems to be very common problem with those unaccustomed to using pipes.

[Yakov]

	Quote: Originally Posted by Eury
	Does the 85 have the same prop bolt pattern as the 100?

Yes!

[sherman89]

New motor is in and flown yesterday, it sounds much healthier and idles better than the previous motor. Although recommended oil is at 32-1 I have mixed the first gallon at 24-1, i am not taking any chances on this one. 26x10 taching at 6200, cut back to 6000 rpm for the first bit of flying, rich but safe. I still hope to make the IMAC at Ocala Fl this Saturday, i will not need smoke at 24-1.

[Jaketab]

Sherman,

Was there any explanaton from DA as to why your first engine seized?

Jaketab

[Carlos Vargas]

hey guys

do you think the DA 85 could be a good option for the H9 EXtra 260????

i fly at 6000 ft. above the sea level

[sherman89]

	Quote: Originally Posted by Jaketab
	Sherman, Was there any explanaton from DA as to why your first engine seized? Jaketab

No, the motor was returned to DA on Wednesday, they would have received it yesterday. I think it was a bad bearing, but I do not know. DA was very fast getting on the problem and shipping me a new motor. The one I have now seems to be better, much easier to start.

[sherman89]

I did pull the plug out on Saturday to check for color and it was typically black from exessive oil and running rich. The plug did not have any grey spatture indicating the piston was coming apart which is very typical of a motor running too hot from being too lean or severe lack of lubrication.

[krayzc]

yeah lean that baby out a little and get ready to enjoy your DA

[bodywerks]

	Quote: Originally Posted by Carlos Vargas
	hey guys do you think the DA 85 could be a good option for the H9 EXtra 260???? i fly at 6000 ft. above the sea level

Carlos, if you build that H9 light, using the lightest available equipment, you can achieve 26 pounds with a DA 100. Mine is 26-1/4 with CF tuned pipes and I installed the pilot!
The 85 would probably pull it OK, but you will have CG issues if you don't pull-pull the rudder.

[3ddd]

what alot of people think is good for a new gas engine is really not good at all.the mixture to break in a new engine is set with amount of oil in the gas not with needles.you need 32:1 or what the dealer recommends and then set the needles to peak and just back off about 300 rpm.if you load an engine up with too much oil it will gum and stick the rings up in the grooves in the piston.these are not glow engines that need alot of oil to run

[rede2fly]

so what your saying is dont be the doctor, just follow the doctors orders. i agree with you on that.and rob dont start off with the belray i gave you