i am going to start buildin a siq kobra here in the next few days.. i was wonderin about putting a tuned pipe on a os max 35 fp for it . can some one point me in the dirction for a pipe for this motor????
thanks
kenn

The OS FP series were not built to take a tuned pipe. They are just not ported to take one. You would be better of with a newer 46AX and would have heaps more power out of the box with out a pipe than you would ever get from the 35. You can look for a Macs pipe or other, but pipe for the smalles motors are getting a lot harder to get because of electric. Try one on the boat suppliers, They may have something.

Cheers

like stated above a larger engine would be the best way to go the fp were good in their time but there are better engines available now.I have a st 40 in mine more than enough power.

buy one of these http://www.hobbypeople.net/gallery/210756.asp
cheaper than a pipe and will be more powerful then a 35fp w/ pipe

that will fit into a sig kobra ok??
have a magnum 40gp that runs great!!

Hi!
All two stroke model glow engines benefit from using a tuned pipe , and the OS FP .35, .40 and .46 are no exceptions.
Just try one!

http://www.sigmfg.com/cgi-bin/dpsmar...FV4.html?E+Sig
i think it would fit fine, maybe a little cutting would be all that is needed. is the plane already built or are you building it??? if your building it then i wouldnt worry about it, if its built than it may be a little harder. the only problem is going to be nose weight, this engine weights 5oz more than a .35 sized engine so you will need to put the battery in the back of the plane. with that engine the plane will haul a.. use a 9x8-10 prop.

what are you trying to accomplish? a plane that really moves or a floater that has some speed? with the .35fp the plane will float better, but if your looking for speed then shove the magnum into it.
worse case senario, you take that magnum.40 gpa off of what ever plane its on and put it on the sig (weights much less than the magnum.46). then put the new magnum in its place. that will give you a more plwer than the 35 with not much weight gain.

The OS 35 is not a high speed engine but a nice sport motor and yes it too will respond to a tuned pipe but not as much as some other choices. Macs has the tuned pipe and header. Do not get the "pre-tuned" setup that the 32SX used because the header will most likely be too short for the 35. Ask for David and he can set you up. http://www.macspro.com/prodline.asp

If you havent got the OS 35 yet, I would get the Webra 36 (without muffler) and contact Macs for header, muffled tuned pipe and #9051 pressure fitting as well. http://www.swanyshouse.com/engines/engines.aspx It' a light, powerful engine that will fit the Kobra.

Put a 9X7, 8X9 or 8X10 APC on there and look out!

For the Webra use a 8X8 for break-in. Cut the header initially to 3.5" for break-in (measured from weld to end) , work it down in 1/8" steps for tuning later. Run at wide open throttle rich 2 two stroke (intermittent rich crackle) for two tanks. In Never use over 10% nitro in this Webra and the fuel should have some Castor in it's oil makeup. Use an OS genuine bubbleless clunk and "real" foam rubber isolated tank or use a bubbleless tank.

Have fun...

If purchasing a new engine is in the budget, the OS.35AX has more than decent power. It is like the other AXs, as it handles very, very well.

Yes, they are super user friendly and if this is his first fast airframe, the OS 35AX would be the better choice. Thou I cringe at the recommendation for break-in and props on most of the AX series engines. For instance a 12X6 prop(after break-in) is on the list for the 35AX's by OSl!!!!???? A bit big??? I run a 12X5 on a 55AX and it's perfect for that engine and 3D .
It' may be better to follow the lead that others have set here on RCU for engine info.

Note: If he pipes the 35, the user friendliness is diminished.

i have a 35 max fp but i do belive i will buy a new os for the kobra after the holidays still have to build the kit anyway thanks all for the info

kenn

Do a search for "mouse can mufflers" they work just fine on .35 to 40. may not be the look your after but hey work just fine for a lot less money.

I cannot speak for the 35FP however I can for the 35AX and it is a superb engine and it will accept the same quarter wave Ultra Thrust pipe that the 25FX uses. The problem is I noticed that Ultra thrust do not seem to be avalible at Performance speciailties anymore and this I was affraid of since Henry Nelson closed his doors. Lets us hope there will be secret stash of castings somewhere for Mr. Shadell to discover.

Anyway I am sure Dub Jett can supply his quarter waves to fit the small OS's.

John

You did say it was for a Kobra right.
<font size="2" face="Arial" color="#000000">Recommended
Engines</font> <font size="2" face="Arial" color="#000000">.19-.35 in&sup3; (3.1 - 5.7 cm&sup3
2-Stroke
Wing Span 45"
Wing Area 390 sq in
Weight 3 1/4 lbs.
Not a very heavy plane. Heck my cheap Thunder Tiger GP25 can make 3.45 lbs of thrust and 69 mph.
You need more than a 1 to 1 thrust to weight just to make it fly????? Idont think it is a 3D plane is it?
If that isnt fast enough my Irvine .25 makes 3.58 lbs and 80 mph on just 5% fuel.

</font>

I built the MCP [mousse can pipe] that uses the front half [header part] of a stock muffler per the plans at SPAD to the BONE web site. I put it on a OS LA40 with a 11x4 prop and got about a 13-1400 rpm boost out of it. Not too bad, it made the engine capable of 3D with explosive transition.
I suspect the 35 would respond just as well, I wonder if any of the "nay sayers" have ever heard of using liner shims for fine tuning if higher rpm with a "speed type" prop is the goal?
Just about any well made 2 stroke can be tweaked to give surprising results with a little bit of effort and talking with the right people.

Pigg Icould not agree more. Have you seen my Thunder Tiger GP42 video?