I'm getting ready to buy my fist set of cannisters and would like to know the differences between the mfgs. My observations to date, though limited to my own field, seem to show some brand loyalty tied the the engine (ie: all the 3w guys run Pefa, DA guys use MTW, ZDZ guys run JMB). I'm sure most just bought whatever cannister system the engine distributor also stocked. I haven't seen any KS cannisters yet. I understand that header length and prop selection are large variables in the overall performance of the power system, but what are the differences in the cans themselves with respect to noise reduction and power gain or loss? Does one mfg tend to have a flat power curve while another maybe peaky?

I've seen a few sets for sale advertised with very low time. I'm thinking if there already installed, why change them out and sell unless they missed by bunch the owners expectations....

you ask too much for a single soul to answer. The cans you mentioned, are all good. If you need power curves, there are none.
All cans can be made to run well if the header length is OK. Too short a header will make the can peaky. Not like a tuned pipe, but still not very smooth. With header too long, you loose power.

To further muddy the waters -- some canisters are mufflers -not tuned devices
just looking at the outside is no clue whatsoever.
Just because power is better than a in cowl muffler does not mean it is tuned - many in cowl mufflers are power robbers and using a simple in fuselage muffler can increase power -with no downside -no tuning problems .

Could you guys answer a question about header length? What would be an aproximate length to start experimenting with on a single cly engine of 87cc displacement. I don't really care about a tuned can, but I want quiet with as little loss of power as practical. This cannister setup is going on a scratch built 35% Extra. The can I'm building is 3.5"dia x 12" long 1.25" inlet. I'm not sure of the outlet dia yet, and also could use a suggestion here too.
Thanks,
Bob

do a search on any mufler you have in mind. You probably will find what you need.
I did work on MTW mufflers. See http://www.prme.nl/forum/index.php [link]http://www.prme.nl/forum/index.php[/link]

Maybe you can find here some info

http://www.rcuniverse.com/forum/m_42...tm.htm#4222862

Cesar

Dick, pr reivers,

If you had to pick between a canister or tuned pipe which would be your choice for 3D flying? My goal is to achieve a smooth transition and fast throttle response (of course we all want this) on my DA-50. I would also like to get the max thrust and have no noise restrictions where I fly.

I right now have a MTW canister but if you have a recommended product, canister or pipe, please advise. Thanks in advance.

P-man

you want it all ?
well this is harder than it looks
1- a fully muffled large tuned pipe gives most power with least noise---it also takes up most space and costs the most
further - you need to match the rpm band used with a prop which is most effective in that band
2- about the most load that engine will work with is a 23x8-- it will turn bigger props but as a good 3D setup you likely will find it is not responsive or heats or is slow revving etc..
the easiest setup is a NON tuned can -just a big open quiet can that is totally numb to prop rpm
A large MTW with a super short header may befine
The JMB is my favorite for this setup -it is quiet and no power losses
try paddle bladed 22x8 props - use plenty of oil 30-1 to allow for heat if all you like to do is hover - and baffle the engine (make good air flow thu the fins and out the cowl) to make certain it stays cool.
The wide open stock DA "muffler" may suit you best if the noise does not concern you.
Personally -I like the quiet setups - the quieter the better .

Dick,

Thanks and good advice. I may just stick with the MTW canister and do some testing. I have seen some using KS pipes on DA-50's but I don't know if they have good tune-ability. My setup is all new so I go into this without experience.

P-man.

The MTW muffler is a good one, and gives more power than JMB. At the same time the engine runs cooler.
For 3D, it is better to have the header slightly longer than for best rpm on your prop. The MTW likes to have the header adjusted well. A slightly longer header will give very crisp throttle response.
The same goes for tuned pipes. Tune for midrange response, and not for best power. In other words, first find best power, then go back a step or two to the longer header length.