| From : |
Ananth |
| Date : |
2003-06-02 10:36:20 |
| Subject : |
Re:Help, Locky doesnt run! |
Milisavljevic,
All the dimensions are correct, except that the combustion chamber has Cm as 133mm.
Thanks for the tips. I will try out each of the solutions you have mentioned, in turn.
What I would like to know is how you calculated the thrust.
The intake hasn't been flared. Is it better to make a new flared cone section & weld it to the intake, or rather flare the existing intake (using flaring tool)? How important is the intake length?
milisavljevic wrote :
>Hello Ananth,
>
>I see that you have attempted to build the "patent Lockwood"; however, you have scaled it to a new set of dimensions. I believe three other people have posted to the forum, after following the example of Lockwood's patent (3,462,955); yet each has deviated from the patent in some arbitrary fashion.
>
>I only point this out, as the obvious reason for following the patent is to recreate a known, and presumably operational, Lockwood-type pulsejet. I hope that this is not the source of your start-up problems.
>
>Not having segment lengths for your engine, as you have provided only diameters, I reverse-engineered your example as a "paper engine".
>
>Please check your engine's dimensions against the following:
>
>a) intake segment --
>
> (a1) Ni = 49.5 mm;
> (a2) No = 53.5 mm;
> (a3) Nl = 192 mm (190-200);*
>
>b) transition segment (intake to combustor) --
>
> (b1) Cl (nc) = 40 mm (23-40);*
>
>c) combustor segment --
>
> (c1) Ci = 133 mm;*
> (c2) Co = 141 mm;*
> (c3) Cm = 137 mm;
> (c4) Cl(cc) = 192 mm (190-200);*
>
>d) transition segment (combustor to tailpipe) --
>
> (d1) Cl(tc) = 52 mm (52-69);*
>
>e) tailpipe segment --
>
> (e1) Ti = 37.5 mm;
> (e2) To = 61 mm;
> (e3) Tl = 1390 mm (1280-1430).*
>
> *calculated dimensions
>
>Additional comments:
>
>(1) this engine may in fact operate properly with a shorter tailpipe; eg., Tl > 1100 mm;
>
>(2) sustaining operation at Tl << 1100 mm, while not impossible, will require departing from "hands-off" conditions; eg., continuous feed air;
>
>(3) if this engine were to run properly, expect it to develop between a maximum of 6.3 to 6.8 kgf of thrust; and
>
>(4) if you should "rework" this engine, consider reducing the combustor diameter to a mean value of 114 mm (Ci = 110 mm; Co = 118 mm); the length (Cl) remains as provided in (c4).
>
>BTW - Did you flare the inlet (eg., form a bellmouth)? This seemingly trivial change to the intake duct may keep an otherwise perfect engine from running properly.
I hope you find this information helpful.
M.
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Hey, wait a moment there!
( 2003-06-02 08:06:00)
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Re:Hey, wait a moment there!
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Re:Help, Locky doesnt run!
( 2003-06-03 06:14:27)
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Re:Hey, wait a moment there!
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Re:Hey, wait a moment there!
( 2003-06-03 13:30:15)
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