Nehring, Eather,Smith/Werwage &OS VF .40

Can the pipe experts explain the differnces in these pipes? I purchased the Smith/Werwage pipe from R. Smith for my VF .40/Ultra Hobbies Impact kit that I hope to build one day...(Week)(Month)(Year)

I've managed to collect one of each. If for nothing else than to "listen" to the differences on the bench. I found an Eather #6 pipe and the Nehring is 19 1/4" long and 1 1/4" in diameter at its widest point. The band in the carbon fibre is at the 14 1/4" point as measured from the inlet.

All are "I was told" supposed to work with the VF .40

(Brett, I remember what you told me. Use whats been proven to work)

John "Just Wondering" Jolley

Thanks in advance.

Good approach, copy what is working. Ted and Dave , do you guys have some words on initial set-up for a VF-40 and VF-46 ( I am in the same boat)
Chris...

There a little different.

>There a little different.
The Eather pipe is the one on top. It is a little bigger and may be less restrictive. It also depends on the outlet as well, however, and with both it and the Nehring pipe that is second most people will use a "Rubber Duckie" to "bend" the exhaust out below the plane. This stinger extension will rob power.

The Smith/Werwage pipe at the bottom has the stinger set at an angle coming out of the pipe and, since this needs no stinger extension, will probably prove to be the least restrictive. (In layman's terms, more power).

Don't worry about what they measure now. You will probably have to cut any of the pipes off to use them. The measurement is from the plug to the first baffle, which includes the header pipe and coupler. Generally speaking, if you cut the pipe off so that at the longest expected length it will have a half to three quarter inch gap between it and the header, it will give you room within the coupler to shorten it at the field. Thus you will be able to adjust it for the best run according to the prop used, pitch, rpm, fuel, etc.