DA85 on pipe! Results please.

[sprice50]

Pricing info:

DA 85 cc Motor 1 $795.00
KS1090 Tuned pipe 125cc 30mm dia 1 $257.00 6
KS1028 Teflon adapter 28 to 30mm id 1 $8.50
EMTC28 Clamp- for 28mm dia headers 1 $2.00
EKS935 Clamp Teflon 34mm (1028 adapter big end) 1 $2.00
50mm Drop Double Bend Flex Header (for 35% AW 260) 1 $60.00

EKS506 KS mount for 90,95,94,1090 1 $25.00

[planebender]

OK guys you have me interested in switching from the 40lb Pitts muffler to the 1090 set up. BUT!!! please tell me something.....How is the transition from very low throd to midrange? I have been bustin my A$$ trying to get my 150 on pipes to run at all on the midrange. I totally love the top end power But it's crap for low speed 3D and forget any hovering/torquerolling. Tell me how the 1090 is for low speed. Thanks

Bender

[tbrum]

	Quote: Originally Posted by planebender
	OK guys you have me interested in switching from the 40lb Pitts muffler to the 1090 set up. BUT!!! please tell me something.....How is the transition from very low throd to midrange? I have been bustin my A$$ trying to get my 150 on pipes to run at all on the midrange. I totally love the top end power But it's crap for low speed 3D and forget any hovering/torquerolling. Tell me how the 1090 is for low speed. Thanks Bender

I haven't flown mine yet (broke it in and done all the prop tests on a stand)... from what I've seen in the testing, the low end is still very strong... spool up is every bit as strong as my DA100 and I can't tell a difference in spool up between a 27 and 28" prop or even if I go to the slightly heavier Mejzlik props...

As for midrange, It seems very smooth but I don't expect to see anything until I get some flight time on it!!

[planebender]

Thanks man, I'm mainly interested in the slow throdle advance, Weather or not it falls on it's face at 1/3rd stick. I will keep an eye on this thread to here from you how it was in the air.

Bender

[sprice50]

	Quote: Originally Posted by planebender
	Thanks man, I'm mainly interested in the slow throdle advance, Weather or not it falls on it's face at 1/3rd stick. I will keep an eye on this thread to here from you how it was in the air. Bender

I'll let you know in 2 weeks I am hoping that DA's porting this motor for pipe performance is true and that this will be reflected in the transition.

Perhaps DAtech can let us know?

[khedge]

it is a bridged exhaust port, I think that is why it makes so much power off a pipe. This motor is insanely powerful and it idles as low as a da twin

[dick hanson]

	Quote: Originally Posted by khedge
	it is a bridged exhaust port, I think that is why it makes so much power off a pipe. This motor is insanely powerful and it idles as low as a da twin

like this (800rpm?) direct ignition reading.
good idle is all in setup - This engine a ZDZ80 J runs a 27x10 Mejzlic -on a pipe the 800rpm is typical on landing
carb is same as used on the DA100 and probably the DA85 so with some carb tiickling -you can get the same .

[crashproof]

Hey guys hope you all are doing well. I have a question for you guys who have the 85. How well do you think this engine might fly the 96 inch Ziroli mustang. I realize it would be a guess but some of you have seen the power it can produce. I have not seen one as of yet. Kevin.

[sprice50]

	Quote: Originally Posted by crashproof
	Hey guys hope you all are doing well. I have a question for you guys who have the 85. How well do you think this engine might fly the 96 inch Ziroli mustang. I realize it would be a guess but some of you have seen the power it can produce. I have not seen one as of yet. Kevin.

I think it will be awesome. I an putting it on my 35% AW 260 at 26lbs.

[khedge]

	Quote: Originally Posted by dick hanson
	like this (800rpm?) direct ignition reading. good idle is all in setup - This engine a ZDZ80 J runs a 27x10 Mejzlic -on a pipe the 800rpm is typical on landing carb is same as used on the DA100 and probably the DA85 so with some carb tiickling -you can get the same .

Wow that is good, I really need to tach mine and see what it idles at. I have a low and high set on my tx. I think it is pretty low on low idle I will check it out. Are you using a std mej 27*10 or the mej 27*10th(I got this one on oder from DA)

	Quote: Originally Posted by crashproof
	Hey guys hope you all are doing well. I have a question for you guys who have the 85. How well do you think this engine might fly the 96 inch Ziroli mustang. I realize it would be a guess but some of you have seen the power it can produce. I have not seen one as of yet. Kevin.

Troybuilt models has a p-40 warbird with a Da-85 turning a 20*12 prop they clocked it at 168, and it will hover too. I think you will be very happy with this engine. The first time you start it up and run it a WOT you will be in shock. I said get that warbird and motor that DA-85 and enjoy. That is a good match for a 96'' bird, so folks are flying 35% with the da-85 because it makes more power on a tuned pipe than a DA-100 on stock muffler. It will turn a mej 28*10 at 6500 on a pipe.

[dick hanson]

I use the std Mejzlic- turns 6500- 6700 on the ground - 7200 in level flight the 85 setup right should be about the same .
as for more power than the 100
piped right - yes -

[khedge]

	Quote: Originally Posted by dick hanson
	I use the std Mejzlic- turns 6500- 6700 on the ground - 7200 in level flight the 85 setup right should be about the same . as for more power than the 100 piped right - yes -

I have a jtec large volume pitts, do you think it will turn it std 27*10 mej?

[krayzc]

khedge i wanted to know what my 85 would turn a prop at so i bolted on a 28 x 10 mejzlik to see on a standard jtec pitts i did 6180 with out touching the needles. I would guess you should get more rpm on the 27th along with that I did not want to see if i could get a few more RPM messing with the high end needle. I had the 28 prop to use on my BME 111 that was only on its 3-4th gallon at the time.

[dick hanson]

	Quote: Originally Posted by krayzc
	khedge i wanted to know what my 85 would turn a prop at so i bolted on a 28 x 10 mejzlik to see on a standard jtec pitts i did 6180 with out touching the needles. I would guess you should get more rpm on the 27th along with that I did not want to see if i could get a few more RPM messing with the high end needle. I had the 28 prop to use on my BME 111 that was only on its 3-4th gallon at the time.

Unless something has changed -- the 28x10 and the 27x10s are pretty much the same as far as a LOAD goes -- the prop designer fiddled with the blade shape to allows this - (more disc diameter with same load .)
the 85 --I would guess --has fallen off it's BEST power band once you drop to 6000 rpm. I say this because they recommend mid 6000 rpm range for breakin -
trying to squeeze more rpm by leaning needles is a bad idea.
The 85 is much like my 80- best power is (without a pipe) - in mid-upper 6000rpm band
Adding a pipe -depending on how you do it - will change max power RPM - either higher or lower (really) than any of the Pitts or other type mufflers .
On my 80 and I suspect on your 85- the most effective pipe setup for aerobatics will be in mid 6000 range -
The most rpm -another ballgame entirely - I can tune for 26" props and change rpm from say - over 7000 on the ground to 8000 in the air . lots of power but effectively -for aerobatics- not the best setup
for MAX rpm - ready for this? - NO pipe- just a really good Pitts style
this setup will allow th engine to unload -unrestricted by the resonant tuning of the pipe - pipes can and DO act as an rpm brake -depending on the setup
I ran a 26x10 ZM prop which ran up to 8400 easily in level or slightly shallow level type - on the arge Pitts muffler from RCShowcase.
Lots of revs but power was nothing special at at all - just unloaded revving . So when you see rpm numbers - you have to look at exhaust system used to get any real numbers for comparison.

[khedge]

thanks for the help dick hanson,

well in that case I think I will be fine with the mej 27*10th that is what DA recommended.

krayzc, 6180 with a mej 28*10 is pretty good with a pitts muffler, I bet that prop noise was minimal.

How do they make the prop load on the 28'' and 27'' about the same?