DA85 on pipe! Results please.

[sprice50]

Tbrum went with an unmodified header from DA. Measuring mine in distance from centre of exhaust port to tip of header in straight line (not along the bend) it is 8.25" long.

[krayzc]

info purposed only!

I bolted on the 28 x 10 Mejzlik on the JTEC muffler and I did 6080 in the back yard. I did not fly this prop or move my needles from the setting for the 26A. I flew this weekend with 26B and I think I love this prop more on this airframe than my previous 25 flights with the A. I did 6600 on the B.

[sprice50]

	Quote: Originally Posted by krayzc
	info purposed only! I bolted on the 28 x 10 Mejzlik on the JTEC muffler and I did 6080 in the back yard. I did not fly this prop or move my needles from the setting for the 26A. I flew this weekend with 26B and I think I love this prop more on this airframe than my previous 25 flights with the A. I did 6600 on the B.

Nice Krazy! I have also heard from others that they preferred the B as you don;t have to apply so much throttle in waterfalls and tumbles and have a better speed envelope. I tried a 27B on my previous setup (110, stock muffs) and loved it and may just try it on the 85. I got off track this long weekend setting up my trex 600 which had a couple issues but is now perfect. Also Highlights has been away so my access to high class help has been sorely missed. Back to the plank and pipe!

[krayzc]

that is great news prior to be doing this B the word was to put an A on the 80 type motors but this 85 thinks its bigger so that explains why it likes the B more

[tbrum]

	Quote: Originally Posted by krayzc
	that is great news prior to be doing this B the word was to put an A on the 80 type motors but this 85 thinks its bigger so that explains why it likes the B more

When I did the tests, my Vess 28B performed really well (6310rpm) on a fairly new motor, but I was running the KS Pipe. On the JTEC muffler, you'd probably be down in the 5700rpm range.

Another great option would likely be a 28A... probably very similar RPMs to a 27B but with more "bite" and better low speed control. I'm going to pick one up at Toledo and see how the engine performs with a 28A.

Cheers

Trevor

[sprice50]

	Quote: Originally Posted by tbrum
	When I did the tests, my Vess 28B performed really well (6310rpm) on a fairly new motor, but I was running the KS Pipe. On the JTEC muffler, you'd probably be down in the 5700rpm range. Another great option would likely be a 28A... probably very similar RPMs to a 27B but with more "bite" and better low speed control. I'm going to pick one up at Toledo and see how the engine performs with a 28A. Cheers Trevor

I'd guess the 28A will have a little more instantaneous pullout but amore limited envelope.

[Henna_Ojisan]

Flew the 35% Extra with the DA85 and KS1090 today. I was running a Mejzlik 27x10th and without touching the needles as it came from DA - 6450 rpms on the first tank. I'll be at the field again tomorrow and will get a chance to run some more fuel thorugh it.

Sweet!!

[tbrum]

	Quote: Originally Posted by Henna_Ojisan
	Flew the 35% Extra with the DA85 and KS1090 today. I was running a Mejzlik 27x10th and without touching the needles as it came from DA - 6450 rpms on the first tank. I'll be at the field again tomorrow and will get a chance to run some more fuel thorugh it. Sweet!!

Wait until you get a few more tanks through it and lean out the H and L needles.... on the TH props, you can probably count on 6700-6900rpm after a couple gallons!!

Cheers

Trevor

[Henna_Ojisan]

It'll be crazy power - right now I'm between 1/4 and 1/2 throttle most of the time and pullout is awesome. The lower weight DA85 and the power make a great combo. My buddy had his DA-85 on a KS95 can and it was pulling about 6150 after about 3-4 gallons where the KS1090 on the first tank was 6450. I did run up a Xoar 26x10 on the motor and was spinning 6650 on the third tank (my buddy and I swapped props so he could test the 27x10th).

Video a bit later once edited...

[dick hanson]

	Quote: Originally Posted by Henna_Ojisan
	It'll be crazy power - right now I'm between 1/4 and 1/2 throttle most of the time and pullout is awesome. The lower weight DA85 and the power make a great combo. My buddy had his DA-85 on a KS95 can and it was pulling about 6150 after about 3-4 gallons where the KS1090 on the first tank was 6450. I did run up a Xoar 26x10 on the motor and was spinning 6650 on the third tank (my buddy and I swapped props so he could test the 27x10th). Video a bit later once edited...

sounds like you guys are zeroing in pretty well
you might try this
put a 26x10 on and fly it
rpm will be higher of course
THEN put the 27x10 back on and fly it
better low speed "pullout?"
If the engine has no bogging or flat midrange runs cool etc- the header is about right.
The std 27x10 which I use on my 80 was down 400 rpm from the 26x10 and on the 26x10 the engine had a slight gurgle to it at FULLpower this was the sound of a mismatch in pipe length.
Once it gets matched - the 3D performance will be notably better on the 27x10 than the 26x10- the vertical acceleration from a stop especially. At least that's the way my engine worked . This is where you can see and will have proven that low speed torque is improved - a LOT - over a std muffler setup or an open stack
your results should be similar.
Some guys on the forum get bad results and then quit on tuned setups - hoping that the exercize would be a plug n play affdair
which is hardly typical.
I got my feet wet on tuned pipes with glo engine stuff - which was pretty misleading as they usually were run flat out or at an idle
My first exposure to gasoline engine tuning was a totally different experience.
Took a while----

[sprice50]

	Quote: Originally Posted by Henna_Ojisan
	Flew the 35% Extra with the DA85 and KS1090 today. I was running a Mejzlik 27x10th and without touching the needles as it came from DA - 6450 rpms on the first tank. I'll be at the field again tomorrow and will get a chance to run some more fuel thorugh it. Sweet!!

Awesome! We'll have the same setups. What does yours weigh all up?

[dubd]

Jason, it was good meeting you at SACRATS last weekend. Glad to hear the Extra is done! My DA-85 and MTW 110 muffler arrived on Sat... now I'm waiting for the H9 Suk to arrive.

Dantley

[Henna_Ojisan]

Dick-
Your comments pretty much sum up my experience this last weekend. I ran the 26x10 on the ground and didn't get a chance to fly it, but the feeling of the 27x10 was "perfect". Spool up was quick and pullout was awesome (no lag, quick response, and the throttle curve was pretty flat and didn't feel really peaky). The only change I made from the stock header and pipe length was to shorten the length by 1/2" by adjusting both ends in the coupler - no cutting reqd. I may have been very lucky and hit the "Sweet Spot" much sooner than others. I'm just breaking the motor in, so I haven't leaned the top end up all the way and will be working that way as time progresses. No real gurgle at WOT that I noticed, but I'll keep an ear out for it... Power to Weight felt amazing!!

Shaun - No AUW yet, my scale died on me so this next weekend I'll see if I can get a buddy to bring one to the field.

Dantley - Great meeting you too! Looking forward to seeing the H9 Suk once you get it ready. Feel free to swing by the field anytime - it was fun to fly with you. Might have to visit Hollister at some point here - field sounds nice and open.

Jason

[dick hanson]

	Quote: Originally Posted by Henna_Ojisan
	Dick- Your comments pretty much sum up my experience this last weekend. I ran the 26x10 on the ground and didn't get a chance to fly it, but the feeling of the 27x10 was "perfect". Spool up was quick and pullout was awesome (no lag, quick response, and the throttle curve was pretty flat and didn't feel really peaky). The only change I made from the stock header and pipe length was to shorten the length by 1/2" by adjusting both ends in the coupler - no cutting reqd. I may have been very lucky and hit the "Sweet Spot" much sooner than others. I'm just breaking the motor in, so I haven't leaned the top end up all the way and will be working that way as time progresses. No real gurgle at WOT that I noticed, but I'll keep an ear out for it... Power to Weight felt amazing!! Shaun - No AUW yet, my scale died on me so this next weekend I'll see if I can get a buddy to bring one to the field. Dantley - Great meeting you too! Looking forward to seeing the H9 Suk once you get it ready. Feel free to swing by the field anytime - it was fun to fly with you. Might have to visit Hollister at some point here - field sounds nice and open. Jason

great! --You may-- not suggesting you do-if you get a chance-- try a prop now , whch loads the engine -maybe 100- 200 rom more on the ground - you may have to trim a 27/ 28x10 thin blade something or other but trimming good wood props isn't hard or dngerous - just make reverything equal
if this load -on the ground - still flies correctly you really have it dialed in . you will be surprised at how narrow the windo really is for perfect respose - full power on top with no lean running
but if you keep around a couple of "test props" I use props someguys don't want because the can't pull em whatever - then reshape till I get the ground loads (rpm) I want to see. these are simply referrence props
Look for guys with old 110/115 etc, 140s or whatever etc., who may have 27/28"props they didn't like. Usually they will sell em cheap.
The 80/85 engines on the market will really supply a lot of grunt-mainly because they have better , bigger porting than the engines of a few years ago. the 100size carb -which I am sure you have is plenty large- just tinker with the header length n prop load now.

[sprice50]

	Quote: Originally Posted by Henna_Ojisan
	The only change I made from the stock header and pipe length was to shorten the length by 1/2" by adjusting both ends in the coupler - no cutting reqd. I may have been very lucky and hit the "Sweet Spot" much sooner than others. I'm just breaking the motor in, so I haven't leaned the top end up all the way and will be working that way as time progresses.

Nice Jason,

I will leave mine stock length in hopes for great results once broken in on the 28x10 Mej and 27B Vess.