HAs anyone tried the DA 50 with the KS tuned pipe? I think the KS 1060 would fit best. What is the power gain using this setup?

I have run the KS tuned pipe with the DA-50 with excellent results. 7500 rpms with Mejzlik 22x10 and very quiet.

Sounds good! Do you remember the distance between center of the engine exhaust window and the baffle or the front end of the pipe, giving me a rough idea how the set up the system?

I know this measurement. The measurent is 12" from the center of the exaust port on the engine to the front face of the can. This is the same as the DA 100 as they have the same cylinders, but there are two of them. The 150's are also the same. That is the optimum header length recommended by DA. I would use the KS 50cc can or larger. A 60cc or 70cc will help it breath and quiet it even further. Many are using two 60 or 70cc on the DA 100's with great success. I run the 70cc cans on my 100 and the plane is very quiet. On the 50 it would really be nice.

Read the rpm/tuning chart published by Krumscheid .
this chart provides recommended length of header to band on pipe for the tuned pipes -which you mentioned .
We found that these recommendations are quite good -as expected.
DA recommends the larger cans on their engines . example a 70 -on a 50
On the Amelung site (Germany) they make the same observation on their ZDZ50 -as it is ported for tuned cans .On engines with similar porting to DA -the tuned pipes recommended by Krumscheid - should work but their maybe a small change in smooth operation.
It was interesting -checking a 160 cc twin - using the Krumscheid chart for overall lengths on the 80 cc 10/80 pipes.
going 2" longer -OR shorter - changed power to lower power.
also shorter made midrange poor.
longer just dropped power
in the correct setting (to chart) -the throttle was perfectly smooth and aggressive in response and power was maximized.

I noticed this too Dick with my 70cc cans on my 100. The boost is smoother and it doesn't have that 'ramp' in the midrange like some of the setups I have seen. It has real smooth transition, and the best part is it is very quiet. I get many comments on how how quiet my plane is. I do run a 3 blade also...the new Mejzlik 25-12, and this prop is outstanding. In combination with the pipes, the setup is whisper quiet, and thrust has not proven to be an issue at all. I can easily do two vertical upline snaps, and come out cleanly, even in 90 F weather. On this gentleman's 50 though I don't think he'll require a 3 blade, but the pipe will really help performance and quiet the plane down.

how does this apply cc wise as i have been looking at the jbh short muffer like cans on rcshowcase site?

the RCS products for the ZDZengines are JMB silencers .
these are NOT tuned cans or tuned pipes -
they do quiet things very well (best of any muffler/pipe etc., I have seen or heard) and with proper selection (ask ) , they don't hurt power and also install in a much shorter space arrangement -
Do use the largest size allowable from each selection -
We have run -and have used every size listed -
My 210 setup -actually runs a bit faster on the biggest mufflers -than on open exhaust.

Hi C,
The JMB ones are non-tuned silencers. Size is really not as important as it is on the tuned setups like the KS, but as Dick pointed out, you want to go with the biggest ones as you want the engine to breath. It also lets those exaust cycles expand more which will help to reduce noise further which is the main reason for instanlling them in the first place. The KS setups give you some boost...up to 300 r's on the canisters and more with the tuned pipes. For the aerobats the canisters are best as they don't have that ramp in the midrange when properly setup. The tuned pipes (baseball bats hehe ) give a bunch more boost, but at the expense of some manageability on the throttle. The 'full' pipes as they are sometimes called really are best suited for racing as the boost is high, and they are very long. I really like the KS setups as they give that little bit of edge as far as power and yet are still very quiet. I saw the JMB cans at the Nall and they are very nice also. It looks like Dick may be getting a little boost out of his setup on the 210 as he says it's kicking more out on the cans than straight out into the air. Kinda interesting on a non-tuned setup. He may have hit the perfect length with that setup and is getting some resonance in the pipe. He IS good at setting these up you know!

On the JMB- the shortest headers have worked the best --simply get the cans as close as possible and use the largest dia header you can get -
ZDZ once set out small headers - the Germans made bigger ones - an improvement!
I went to 30mm id on my 60 --it was even better !
BTW the long bats do not have any peaky character if you get it all correct --on th ZDZ160 -on the 10/80 pipe - a 72cm length from exhaust to band on pipe is good .-nice power and smooth transition -the overall setup tho is preeetty long.
We ran over 6500 on 30x10 Mejzlic way too fast --the30x12 Bambula was at 6100
Youreally should try any setup on a bench before ever putting it in a plane -saves a lot of heatburn.

Thanks for the tip with the chart.
I will use the KS 1060, which is fine for engines up to 70cc. The KS bats are commonly used in aerobats, particular in competition over here. They give you some 300-400rpm advantage from the KS canisters at pretty much the same weight and the canisters are usually used anyways to meet noise restrictions. The bats give you an rpm advantage with about any engine, whether DA, ZDZ or 3W, but one of the engines with best response using a tuned pipe is actually the G62 .