ashpowers
Veteran Member
Joined: February 2011
Posts: 207
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Post by ashpowers on Sept 2, 2014 1:31:38 GMT -5
Hi John
(TV94 bits) Me as well!
On a novelty's note: You do realize that in the whole world there is probably only about 4-6 of "us" that are actually building and running DIY gas turbines purely for fun at any given time? ;-) You just re-added one to that list. <grin>
Cheers back at ya!
-Ash
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nersut
Veteran Member
Joined: September 2012
Posts: 223
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Post by nersut on Sept 2, 2014 12:17:52 GMT -5
Hi John
Very nice and professionally build turbine engine you have created!
Also a super mentor & inspiring person!
Cheers
Erik
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Post by racket on Sept 2, 2014 17:04:52 GMT -5
Thanks Erik :-)
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Post by stoffe64 on Sept 4, 2014 14:29:21 GMT -5
Hi John
I agree with everyone else in here, you are THE mentor,you have been doing this for forever,i started with this interest 10 years back ,i vänd to the yahoo Place and you welcomed Me aboard there, so får i havent got any engine running but One Day.....
Great to that you are at it again,i sure want to see this 666 engine as well.
Cheers/Stephan
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Post by racket on Sept 4, 2014 16:53:27 GMT -5
Hi Stephan
LOL.....it has been a while :-)
Keep doing a bit each day on your engine and it'll get finished , it took me a decade with my first engine .
The 666 engine will hopefully get there one day , I was feeling well enough yesterday to tidy up my workshop and put away all the tools I was using to get the FM-1 engine going again, ..............once I have a clean workspace I can spread out the 666 bits and start looking at them with the intention of doing something about fitting them all together
Cheers
John
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Deleted
Joined: January 1970
Posts: 0
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Post by Deleted on May 15, 2016 0:58:18 GMT -5
Well FM-1 is going to live again John has passed on the FM-1 engine so that it will be used instead of sitting a box I plan to make a free powered go kart using FM-1 as the gas producer John had already worked out that the C20 third stage turbine wheel would be a perfect match Using the C20 NGV and wheel will make things a lot easier to build so started to make the connection between FM-1 and the NGV  had to cannibalize the existing nozzle  here the Inner cone on the NGV  and with the outer cone, still need to make some 'cover' plates to join the inner and outer cones  full work week coming up so the rest will have to wait until next weekend. Cheers Chris |
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Post by Johansson on May 15, 2016 1:59:15 GMT -5
Great news! Compared to a jet powered cart this thing will absolutely haul ass!  How do you intend to fit the cone to the C20 NGV? I will do the same job on JU-02 since it will have a 4th stage C20 NGV instead of the home made NGV I use now, so hopefully we can exchange some ideas. |
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Post by racket on May 15, 2016 2:43:58 GMT -5
Hi Chris
Good to see the Thread coming to life, and the Fat Lady making a comeback ;-)
You've been busy this last week .
Cheers
John
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Deleted
Joined: January 1970
Posts: 0
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Post by Deleted on May 16, 2016 5:12:52 GMT -5
Great news! Compared to a jet powered cart this thing will absolutely haul ass! How do you intend to fit the cone to the C20 NGV? I will do the same job on JU-02 since it will have a 4th stage C20 NGV instead of the home made NGV I use now, so hopefully we can exchange some ideas. Hi Anders we can only hope !! here the back side of the cone, will make up a 'disk' which will be welded to the cone and using allenkey bolts will be fastened from behind  here the view of the 4th stage NGV, I would make a cone to sit on top of this ,drill some holes through the air seal (silver bit in the middle) and fasten from the back  here with the 4th stage wheel in place, plenty of room for bolts to hold it all together  You mentioned that you make your own vband clamps ,how or do you know where to get a 140mm and a 200mm clamp from? cheers Chris |
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Deleted
Joined: January 1970
Posts: 0
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Post by Deleted on May 16, 2016 5:22:21 GMT -5
Hi Chris Good to see the Thread coming to life, and the Fat Lady making a comeback ;-) You've been busy this last week . Cheers John Like you said John and I quote "I'm enthused" bit by bit ,and the weather is a bit cooler now ,it's nearly winter and it's still 28 during the day. It's a bugger though ,still have to do that thing called work. Do you still have the figures for the freepower gearbox for FM-1 what gear ratio should we aim for ? and just for arguments sake, would there be any benefit in mounting both the 3rd and 4 stage NGV's and wheels Hows Big Boy, pulled him apart yet? Cheers Chris |
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Post by Johansson on May 16, 2016 7:29:39 GMT -5
Great news! Compared to a jet powered cart this thing will absolutely haul ass! How do you intend to fit the cone to the C20 NGV? I will do the same job on JU-02 since it will have a 4th stage C20 NGV instead of the home made NGV I use now, so hopefully we can exchange some ideas. Hi Anders we can only hope !! here the back side of the cone, will make up a 'disk' which will be welded to the cone and using allenkey bolts will be fastened from behind here the view of the 4th stage NGV, I would make a cone to sit on top of this ,drill some holes through the air seal (silver bit in the middle) and fasten from the back here with the 4th stage wheel in place, plenty of room for bolts to hold it all together You mentioned that you make your own vband clamps ,how or do you know where to get a 140mm and a 200mm clamp from? cheers Chris The 3rd stage NGV looks a bit different to the 4th stage, but the idea of bolting the cone to the NGV is great! I had planned to fit internal struts from the outer cone to hold the inner cone centered but heat distortion might be an issue and the only way of knowing is to tear the engine apart, so fixing the inner cone directly to the NGV is a much better way of doing it. Wire locking the bolt heads is a must so they can´t come loose and hit the freepower turbine. I might reconsider making my own v band clamps, just found this on Ebay. While making JU-01 I couldn´t find anything larger than 4" but that was a couple of years ago now. www.ebay.com/itm/6-Stainless-Exhaust-V-Band-Clamp-Flange-Kit-V-band-vband-MALE-FEMALE-DESIGN-/351617856168?hash=item51de0eb2a8:g:syoAAOSwL7VWhYSD&vxp=mtrCheers! /Anders |
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Post by racket on May 16, 2016 15:55:27 GMT -5
Hi Chris
Nope , you can't have both wheels, you'd need a lot more pressure going in to be able to divide up the overall pressure drop 4 times and do things efficiently.
I think I once did the calcs for using two stages and there wasn't much difference in horsepower output , but a lot more complication, also the rpm would be cut "in half" because of the lower gas speeds through the two stages , and lower turbine blade speeds mean lower power , thankfully having two wheels restores the overal output and the lower gas speeds are more "efficient"so a slight improvement in horsepower , but with our relatively low pressure ratios across the freepower stage , one is enough for FM-1 .
Ander's JU-02 engine is a different matter as its exit pressures will be a lot higher and could benefit from 2 freepower stages to keep gas velocities lower than what will be required with a single stage
With the gearbox , probably ~8:1 ratio overall between freepower and kart axle .
Theres V band manufacturers with big ranges of sizes as well as one offs if needed
Haven't opened up the Fat Boy , might try for a high power run first ;-)
Cheers
John
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Post by smithy1 on May 16, 2016 16:36:18 GMT -5
Haven't opened up the Fat Boy , might try for a high power run first ;-) Cheers John Ooh....LOL..you'll need plenty of rope for that John  ....she had plenty of mumbo even during the modest run we did last week....she's gunna have a healthy amount of push I'm guessing..! Are you going to remove the divergent pipe first?....or leave it on for the first run...? Cheers, Smithy. |
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Post by racket on May 16, 2016 17:02:50 GMT -5
Hi Smithy
I think I'll leave the divergent pipe on for the testing to keep temps as low as possible , then remove it once I have some "numbers" .
Yep , she'll be tied down tightly , probably leave it mounted on the trailer .
Cheers
John
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Post by smithy1 on May 16, 2016 17:13:01 GMT -5
Hi Smithy I think I'll leave the divergent pipe on for the testing to keep temps as low as possible , then remove it once I have some "numbers" . Yep , she'll be tied down tightly , probably leave it mounted on the trailer . Cheers John Be sure to tie the trailer down tightly too...there's enough in that engine to send it up the road...LOL..  Cheers, Smithy. |
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....she had plenty of mumbo even during the modest run we did last week....she's gunna have a healthy amount of push I'm guessing..! Are you going to remove the divergent pipe first?....or leave it on for the first run...?