Pipe length
 

Looking for info on pipe length for an os 140rx with an os pipe and header. going to start with a 17-12 prop. does header need to be cut any? can anyone suggest a length?

RE: Pipe length
 

it depends on a lot of factors.

head shims, nitro content , altitude etc. are you using the suggested os tuned pipe?

at sea level we actually lengthed the pipe by about 20-40 mm with an apc 17-12 and ran 20%nitro fuel with a straight 20% cool power oil mix. i think from memory we also ran one extra thin head shim as well.

it really is sometimes quite frustrating [:o]experience to set one of these up properly but in the end if it works, the results are definately worth it.


aerowiz

RE: Pipe length
 

Hello 426miller
A friend of mine has an OS140RX with pipe and reso OS.
Because he had no place in his fuse , he cut the pipe OS about 60 mm.
OS runs very fast with 25 % nitro and APC 17x12 on pattern which weight is 5000 g.
With that he did P07 and F07 easily.
Claude

RE: Pipe length
 

Check www.nsrca.org In the links section there is a web page with a lot of information in setting up engines. You won't go wrong using that information.

Vicente "Vince" Bortone

RE: Pipe length
 

426miller,

Just to give you my setup, it works very well, at least for me :) I'm using the Greve pipe and a dual plug head. A5 as center plug and OS-F as rear plug. The total length og my pipe setup is, measured from the middle plug and to the end chamber of the Greve pipe: 87 cm. I have added 2 extra head shims (total of 3). I use a APC 18x10 propeller and 15/15 nitro/oil fuel. The 18x10 propeller accelereates my plane very well with this setup, and I have to be quite restrictive on using full throttle when flying the Nordic sceadule.

Regards,
Dag Ragnar