i have a brand new OS .20 (see pic in link)
http://osengines.com/history/osm640/...1-max-20rc.jpg

no muffler though...........anyone no of any after market mufflers that will work, or do i need one at all.

i plan to build a big glider for it and fly it at the school yard or adjacent field where a bunch guys are showing up on the weekends and flying electrics.

It takes the OS #703 muffler. There's usually one up for auction you know where.

I found some fiber washers at my local hardware store that fit inside the #703 absolutely perfectly. They really cut down on the noise and seems to help the idle, too. I'll post some photos later. I have two Max .25's of that same series.

David

The .15, .20, and .25 take the #702 muffler. The .30, .35, and ,.40 are fitted with #703.

The hard one to locate is the #704, I need two of these myself. They go for more $$ on fleabay than I wish to spend......

well about as soon as you said it, i found one..............................funny thing about Ebayers, they bid against themselves the whole time an item is up for auction................really defeats the purpose of getting something for a good price. just drives the price up.
i like to drop the hammer 5 seconds before the auction ends, but i see folks bumping a bid by 10-20 bucks just minutes before an auction ends............and then if that's not funny enough, some items go for more than you can buy for new...

Oops! your right rcdude7!! What was I thinking.

I have two 703's, one is on my max .50. Two of my four #702's are on my .25's.

I just saw a #704 go for around $25, I think, but it was missing the strap. I also want one of these.

I hear you, I've been watching a max-s .25 there to round out my collection, it looks like it is about to close and it's up there $$ already. Oh well, there will be another along sometime.................

good example of last minute price bumping if i ever saw it is this one.......too funny what these guys are doing to each other here.......

http://cgi.ebay.com/OS-FS-91S-Four-S...QQcmdZViewItem

My .25's run great. I'm building a Midwest Tri-Squire that will be covered with silk and dope. One of these will go in the nose.

David

I just listed this a few minutes ago: http://cgi.ebay.com/ws/eBayISAPI.dll...MESE:IT&ih=012

Started the bidding @ .99, I'm curious to see how many bidders will be clubbing each other over the head to get it.

I'll trade you one of my Max .25's for it!

i'll trade you a 702 for it and i'll even throw in some Great Planes fuel tubing

[sm=spinnyeyes.gif]

Last second bidding on ebay is called sniping and there was even a program available to do it automatically. It would bid a couple of seconds before the end of the auction just above the last bid.

Those OS mufflers are all over the place. Try collectos, EEEbay, or join Meca. I have several of each and many that are with their original engine.