Moderator: Mike Everman
Graham C. Williams wrote:Why do you have 2 maximum thrust values?
Graham C. Williams wrote:The ultimate Thrust value is interesting but what does it assume to get this value?
Larry Cottrill wrote:I am usually in trouble when pretending to be a theoretician ;-)
milisavljevic wrote:I am usually theorising when pretending I want to stay out of trouble! ;-)
milisavljevic wrote:The figures that I listed were determined at maximum thrust, and in any event, they are
far below the Dynajet (your standard of excellence ;-) Did you notice the TSFC calculated
at ultimate thrust? Did you notice that this thrust level exceeds the Dynajet by some 6%?
Yes, the tailpipe is overexpanded, and the relative lengths of intake and tailpipe are not in
optimum proportions to one another, and the intake needs to be relocated back a little bit;
so what? Go forth, and design a FWE VIII MkII! And ditch a few pesky Roman numerals!
You are CLOSER now to realising your oft-stated pulsejet goals than you have ever been!
Larry Cottrill wrote:Once we have some engines with really decent SFC, it would be fun to have jet-powered "endurance" contests.
Doesn't look like any FWE will be a contender in such events, though.
Did you write that last sentence, Larry? It does not sound like you! This is a sweet motor!
She just needs a little more work... You would not want life to be too easy, would you? ;-)
milisavljevic wrote:One note: James' interpretation of the intake design is best; Larry's smooth transition into the combustor
is contraindicated by the model. I strongly encourage Larry to revise his plan to reflect James' intake style!
Larry Cottrill wrote:READ THIS FANTASTIC CLAIM: I would be willing to bet that if it were somehow measurable world-wide, the Fun-to-Effort Ratio would be higher for the Short Lady than for any other homebuilt jet ever designed. Won't get me in the Guinness Book of World Records, but it's a comforting thought (or arguably, delusion), just the same ;-)
Eric wrote:Would it be possible for you to run it with a piece of flashing under the intake so that it doesnt cool the pipe and we can get a good idea of the temperature gradient across the engine?
Eric wrote:I cant quite tell from the pics, but the intake might be able to be flared more. The intake flare is probably one of the most important things for full power development.
Eric wrote:How does the sound compare to your first FWE?
James D wrote:Eric wrote:I cant quite tell from the pics, but the intake might be able to be flared more. The intake flare is probably one of the most important things for full power development.
Judging by the substantial drop in thrust just from clamping a piece of plate under the intake, youâ€™re probably right, Iâ€™ll make a better flare this week.
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