DA85 on pipe! Results please.

[Ground Pounder]

	Quote: Originally Posted by gareth.ky
	Sorry, I meant whats the model number of the MTW tuned pipe they are using?

That is what I am trying to find out.

The 170 thread said that one of the guys had great performance on the RE3 type so that is my best guess.... but only a guess.

DA 170 -any info?

[Ground Pounder]

Bodywerks might have some info given his close working relationship with DA.

[Ground Pounder]

This is the link that I found but once again I don't know if this this "the pipe" and/or the next must have item on my shopping list.

http://www.mtw-daempfer.de/index.php...id/8/Itemid/69

[sprice50]

	Quote: Originally Posted by Wild Thang
	Seriously? Did you test it or did someone else? If so, cool!

Yes, done earlier in the thread by another member with an eagle tree system on the 35% AW 260 KS1090 and compared to Reza's results on his QQ 101" yak with DA85 and greeves pipe. Both ran 28x10.

KS1090 was around 6650 rpm! Seriously, I don't think finding another pipe is the real issue here. The power is insane on any pipe!

[Ground Pounder]

I agree that the power is more than enough but more is always better. My primary interest is an extremly linear response. Especially at mid throttle while hovering.

[sprice50]

	Quote: Originally Posted by Ground Pounder
	I agree that the power is more than enough but more is always better. My primary interest is an extremly linear response. Especially at mid throttle while hovering.

Part of having a nice soft zone in the hover so that throttle is not notchy is a little neagative expo. I have -20% expo and also have my carb only 1/3 open at 1/2 throttle.

That is why I always take it with a pinch of salt when people say they hover at 1/3 throttle. this is usually because at 1/2 throttle their carb is half open and at 75% power

Even with my expo and carb settings I have unlimited vertical at 75% throttle. If I advance the throttle it still has noticeable acceleration and is really powerful.

The other thing to consider is noise. At these types of RPM prop noise can become an issue. I have even considered trying a 29x10" to get the RPM around 6300.

The MTW pipe you were discussing is the RE3

RE 3
830 mm
28 mm
15 mm
60 mm
ca. 350 g

For comparison, the KS1090



Aluminium-tuned-pipe up to 125 ccm with bent outlet 75°article-nr1090-4 Bmotor size

up to 125 ccm

Lg

750mm

øde

30mm

øda

18mm

øD

75mm

Gewicht

410g

So it appears the RE 3 is about 3 inches longer, and 2 oz lighter. Likely a little more fragile.

Not sure what the greeves specs are. If anyone knows please add them.

[Ground Pounder]

Very interesting dimensional comparison. Just looking at the length, the MTW is longer and I would inherently think that it would be better with a bigger prop running at a lower RPM.

I look forward to when someone can provide data while using the MTW pipe.

[sprice50]

GP - I don't think you can make comparisons based on length alone. There are so many factors e.g. pipe volume, reasonance, header length. If you can find a drop in pipe combo that isn't a pain to tune (like the 1090) I say go with it. Mostly has to do with having enough volume, which the KS and MTW have.

Be different, buy the MTW and let us know.

[tbrum]

Well... I was breaking in a new DA85 / JTEC pitts muffler on a 35% Carden Edge 540.... at 25 lbs, it had good pull-out of a hover, but nothing spectacular.... I also kept having issues with the pitts muffler coming loose and welds letting go.

So.... I decided to go back to the trusty KS1090 pipe and shoe-horned it into the Edge. To balance I also moved the A123 batteries right to the front and added 6 oz of lead to the motor box.

Again, break in continued on a 28x10 Mej at 6600rpm, but the acceleration now from a hover (even with the added weight) is absolutely spectacular.... even better than a rocket ship!!



After many, many gallons of fuel on multiple DA85 / KS1090 / Mej 28x10, I think this is one of the best set-ups around.... reliable and insanely powerful!!!

[sprice50]

Trev,

How much does your Edge weigh dry?

[castorbricoleur]

	Quote: Originally Posted by tbrum
	Shaun... that's great news that you've got a combo on it's way!! I just finished mounting mine (the one that gave me those performance #'s below) into a 35% Aerotech Yak Build.... the pipe and header works out to just over 36" long and looks awesome in the 3-sided tunnel. All finished an balanced, my Yak with DA85 and KS-1090 Pipe comes in at 28.4 lbs... DA tells me that the DA85 on the pipe will run this 28lb set-up crazy!! Good luck with the DA85... you'll never look back with the tuned pipe!!! Cheers Trevor

Hi trevor,

What headers are you using with DA-85/KS-1090. I can't find the header info anywhere.

Thanks J-F

[sprice50]

	Quote: Originally Posted by castorbricoleur
	Hi trevor, What headers are you using with DA-85/KS-1090. I can't find the header info anywhere. Thanks J-F

We both use the double bend flex headers from DA.