RCU Forums - View Single Post - SR-71 Tailpipe alignment design question..
Old 09-02-2008 | 02:12 PM
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Lance Campbell's Avatar
Lance Campbell
 
Joined: Oct 2002
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From: Columbia, MO,
Default RE: SR-71 Tailpipe alignment design question..

Slight side note, of why the engine out issue won't be relevant..

I'm putting in a pair of JetCat 120's into it. JetCat has a unique feature that allows you to connect two ECU's so that if one engine has an uncomanded shutdown, it can shut down the other one as well.

If this was a centerline mounted twin, such as a F-4, F-14, or A-10, such a feature would not be relevant, as one engine could have a chance to bring back the plane.

As much as I'd like to have delusions of grandeur of bringing in a Blackbird on one engine, banked into the engine at 30 degrees and all, I'm too realistic. I flew my Yellow SR for 3 years, and had 3 engine failures (the first 3 flights with it). The first 2 landed without a scratch, as I could hear when one ducted fan engine died, and could immediately throttle the other one back. The 3rd time I wasn't as lucky and could not hear it when it happened (other jets in the air), and stayed with the throttle. Seconds later it was in a spin. I've also helped a few other guys fly their ducted fan SR's as well.

From all of that I've come to the conclusion, that if you have an engine failure, you've got 5-7 seconds to get the other engine brought back in power, or you'll have a spin on your hands. I even weighed the thought that, would I want the good engine brought to idle and I could throttle it up carefully, for a few pounds of thrust. Then after realizing a fire is the biggest risk of loss, I'd much rather have a traditional 'dead stick' with no power, than a spin into the ground with one engine still turning and a potential resulting fire. With that in mind, I considered the JetCat auto shut down of the other engine a real strong feature in my particular application.

Lastly, thanks for all the posted thoughts above.

Lance