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Post by jetjeff on Oct 2, 2016 10:47:31 GMT -5
Hi Lofi, Thanks. I was going to light her off this afternoon, but my welder/cameraman/helper has family commitments and can't come over until tomorrow. This will give me time to check things out one last time, plus I've got tons of work to do around the house. I hope the fish scale doesn't melt. Thanks for your patients. Jeff
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gtbph
Veteran Member
Joined: August 2013
Posts: 101
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Post by gtbph on Oct 2, 2016 14:42:13 GMT -5
Nice work Jeff, the engine is a beauty! The mirror is a very good idea.
Good luck for tomorrow, Alain
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Post by jetjeff on Oct 2, 2016 15:57:02 GMT -5
Hi Alain,
Thanks. If this one doesn't work, I have my old build to try.
Jeff
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Post by jetjeff on Oct 4, 2016 1:07:21 GMT -5
Hi All, No luck trying to start either my new or old build. I'll upload two videos, the first video, I tried using the Butane/Propane fuel mix, the second was straight propane. At about 1:13 into the 1st video, I'm not sure if the engine was running. In both cases, it seems like the flame is not backfiring into the combustion chamber. youtu.be/6g_Zb5TKQDYJeff
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Post by jetjeff on Oct 4, 2016 1:10:57 GMT -5
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ripp
Veteran Member
I'm sorry, I don't speak english, so I torment you (and myself) with a translation program,Sorry
Joined: January 2013
Posts: 236
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Post by ripp on Oct 4, 2016 11:45:28 GMT -5
Hi Jeff, you have to turn the compressor pistol in the right direction so to spins up the machine quickly. with a mirror, you can very well control the turbine wheel here my KJ66 from 1997 when the flame flashing back into the combustion chamber, you can hear a "plop" and the machine has a different sound, than you have to speed up the turbine engine quickly. Ralph translate.google.at
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Post by jetjeff on Oct 4, 2016 14:52:52 GMT -5
Hi Ralph,
Thank you sir for your help. I did have some success trying to start my old build (the Kamps engine) today. I wasn't cutting back the propane flow when it first ignited, so the flame didn't backfire back into the burner can. Also, I was using compressed air set too high and was blowing the flame out in some cases. I started using a shop vac instead of compressed air and it seems to be working.
It's kind of hard when you don't have a FADEC module controlling the startup.
So it's a case of operator error, instead of builder error.
Nice KJ66 of your's there.
Jeff
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Post by jetjeff on Oct 5, 2016 2:02:59 GMT -5
Hi All, I'll have to machine a groove in the front cover of my old build, to fit an O ring, because the high temp silicone RTV caulk I used to seal the front cover is getting blown out. Jeff
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Post by jetjeff on Oct 5, 2016 2:38:08 GMT -5
The nylon T nuts I made for the test stand slide work well. The more pressure you put on the stand, the easier it slides. The plastic fish scale did melt BTW,,,will have to rethink that one,,,lol. Jeff
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Post by jetjeff on Oct 9, 2016 14:48:42 GMT -5
Hi All, I've having some success with switching to the shop vac instead of compressed air. At least the flame is backfiring into the burner can. I actually tried ethanol, but the vinyl tubing popped off the aquarium valve, I'll have to get some Tygon tubing the right size. Jeff youtu.be/bgF8iLms-1c
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Post by racket on Oct 9, 2016 16:19:25 GMT -5
Hi Jeff
I looks like you need more "starter" power to get over the "hump" .
Your flametube is working and you've got sufficient fuel going in but the engine needs a tad more help .
Can I suggest using the normal technique of having the shop vac outlet with a "funnel" that covers and seals the intake so that all of the vac air goes into the engine .
During a spoolup we need not only air flow but some pressure to force the air through the restrictions created by the flametube holes and NGV throats , the shop vac when sealed against the intake will provide that pressure .
All the best with the next attempt , its getting close :-)
Cheers John
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Post by jetjeff on Oct 9, 2016 18:08:50 GMT -5
Thanks John,
I feel, I'm very close to self sustaining. She is spooling up, and the case pressure is pushing oil into the bearings, I sort of freaked when I saw the temp rising in the mirror, but i think that was normal combustion.
Thanks for your input, I will try a funnel.
Jeff
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Post by smithy1 on Oct 9, 2016 19:34:58 GMT -5
Yep, she's very close...as John said, she just needs a bit of help to get over the "hump"...An engine of that size will probably need ~28,000 or so to self sustain. Start temps are normally a bit higher than normal running temps, expect to see ~750C+ during start, If she starts to shoot quickly higher, abort the start.
You said "case pressure pushing oil into the bearings"....Am I to assume you have a full oil lube system to the bearings?? Does the oil then get burnt out the back..!??
Cheers, Smithy.
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Post by jetjeff on Oct 10, 2016 0:19:56 GMT -5
Hi Smithy,
Yes, there is a full lube system. I'm using Kamps methodology (using case pressure to force oil into the engine) , once liquid fuel is used, I'll fit a T in the line to supply the oil. Yes, the oil get burned out the back.
FYI, I've started work on another Schreckling turbine, will start a new thread. This one is just a tad larger than stock. You guys should have warned me that this endevour is addictive,,,lol.
Jeff
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Post by jetjeff on Oct 10, 2016 1:28:35 GMT -5
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