ORIGINAL: rhklenke
ORIGINAL: pilott28
There is no published rule relative to thrust loss for bifurcated pipes, so it would be up to the inspector. If you were within a pound or two and had a bifurcated pipe, I think most inspectors would be OK with it as long as everything else was up to snuff. Bob may want to comment on this.
I would agree that accounting for 2 or 3 lbs of thrust loss for a bifurcated pipe would be reasonable. It does bring up a good point though, and that is, we (at least in the US) don't have a lot of experience in what the correct pipe sizes should be for an engine with more than 45 lbs of thrust - maybe we can get Tam and/or Bob Wilcox to take a look at this (or maybe they already know).
BTW, I know that the P-200 is currently de-rated to 45 lbs for sale in the US. Anybody know what the normal thrust is, or can be?
Bob
This might be a good example of the technical data that the JPO hopes to pull together in the next few years for our web site .... a pipe expert's design criteria that we could all use to make sure we sizing pipes correctly. You could even extend the thought to intake area as well.