rythmnbls
Veteran Member
Joined: August 2011
Posts: 145
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Post by rythmnbls on Mar 15, 2012 19:40:48 GMT -5
I've been working on this build for a few months now ( since Oct 2011 ) and thought I might post a link to the some photos of progress. If you are a member of the GTBA you're probably familiar with this build. The basic design is by Gerald Rutten, the plans can be downloaded from his website here, members.tele2.nl/geraldensuzanne/turbines.htm The original design is based around a Schwitzer 316954 compressor wheel, with the NGV and turbine wheels from Jetmax. This build is based around a Garrett T04E 54 comp wheel with shop made NGV and turbine parts. The main reason for not using the Jetmax parts in this build is they are a bit small for the Garrett wheel and would probably result in excessive EGTs, plus I like to make as many parts as possible. So, after recalculating all the critical angles for the diffuser, NGV and turbine to match the Garrett here are some links to photos of progress so far. Link to the album on photobucket s87.photobucket.com/albums/k142/madluther/Turbine%202/Slideshow of the above s87.photobucket.com/albums/k142/madluther/Turbine%202/?albumview=slideshowThanks for reading. Steve.
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Post by ernie wrenn on Mar 16, 2012 7:38:36 GMT -5
Beautiful work. It is amazing how creative we get working on our projects.
ernie
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Post by turbochris on Mar 16, 2012 9:49:51 GMT -5
that little f'er is gonna scream! I wonder what it would do with a free turbine hung off the back?........ burnouts and wheelies!
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rythmnbls
Veteran Member
Joined: August 2011
Posts: 145
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Post by rythmnbls on Mar 16, 2012 16:33:43 GMT -5
Ernie, thanks for the compliments.
Chris, funny you should mention free-power, according to my spreadsheet this thing should max out at about 170N thrust or about 40HP with a free power. All I would need then is nice light bike frame like a RZ350 or RGV250 to mount it in and my addiction would be complete. ;D
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Post by racket on Mar 16, 2012 17:35:31 GMT -5
Looking good Steve
Cheers John
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wolfdragon
Senior Member
Joined: April 2011
Posts: 287
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Post by wolfdragon on Mar 16, 2012 18:37:18 GMT -5
looks like that is a totally manual mill and lathe, do you even have a DRO?
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rythmnbls
Veteran Member
Joined: August 2011
Posts: 145
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Post by rythmnbls on Mar 18, 2012 15:43:31 GMT -5
Nope, no DRO. I could use one on the mill, although it would be putting lipstick on a pig. I really need a better mill. I finished up another part this weekend, the diffuser cover. Photos have been added to photo bucket album. Here's a pic of the finished part. Steve
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wolfdragon
Senior Member
Joined: April 2011
Posts: 287
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Post by wolfdragon on Mar 18, 2012 18:04:54 GMT -5
Yeah I'm still looking for a place to buy a decent mill that doesn't cost an arm and a leg... problem is that when you are looking for a bridgeport, wells index, or something else of that type of design/quality, you end up usually paying a premium even for a used one...
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Post by ernie wrenn on Mar 18, 2012 21:37:34 GMT -5
Where are you located? I am selling 2 of my mills.
1 is a Comet with power table and cross feed. 2: is a open face CNC that has only cut delron and aluminum. We used it for opening a 52 mm hole to 58mm. 3: Also have 3 lathes (1 with DRO used with only light leaded bar stock. As new and most tooling still in wrapping ,loaded)
ernie
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wolfdragon
Senior Member
Joined: April 2011
Posts: 287
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Post by wolfdragon on Mar 18, 2012 22:10:04 GMT -5
Ernie, I am in southern maryland, Augusta isn't too far away for me... Please PM me and let's see if we can figure something out
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Post by Johansson on Mar 19, 2012 0:56:07 GMT -5
Really nice work Steve! I especially like the turbine blade profiling jig, very clever.
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Post by ernie wrenn on Mar 19, 2012 8:37:45 GMT -5
Give me a call : 800-648-7687
ernie
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rythmnbls
Veteran Member
Joined: August 2011
Posts: 145
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Post by rythmnbls on Mar 19, 2012 11:46:26 GMT -5
Thanks Anders, I wish I could take credit for that idea, but Martin Stouten originally posted that method on the GTBA forum. It works well though.
Steve.
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Post by Johansson on Mar 20, 2012 1:06:45 GMT -5
Thanks Anders, I wish I could take credit for that idea, but Martin Stouten originally posted that method on the GTBA forum. It works well though. Steve. Now that you mention it I remember that Martin posted some pics of the jig in his tractorpulling thread. Too bad that GTBA is so inactive these days, it feels like the developing days are over and people have sort of lost interest or moved on to companies with no intention to share any new developments with the community.
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Post by racket on Mar 20, 2012 3:41:39 GMT -5
Hi Anders
Yeh , I just rejoined the GTBA again after several years and it certainly has lost a lot of its earlier "enthusiasm" , I sorta "blame" this on the narrowing of focus to RC aero engines , there are a few exceptions , but its basically high tech aero which means the guys are only making something that can be bought over the counter at prices that are getting cheaper all the time, there will always be guys who want to build models , but for those who also want to use them in their RC aircraft and prefer the flying to the construction its hard to justify the hours of construction for an end product that will most likely be inferior to a cheaply purchased engine , its an unfortunate "evolutionary" deadend .
The RC micro turbine engine is probably reaching its final stages of evolution , a bit like turbochargers and even full sized turbine engines , its getting harder and harder to make improvements without extremely complicated/expensive engineering .
LOL................thats my 2 cents worth ;-)
Cheers John
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