beaker
Member
Joined: March 2014
Posts: 18 
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Post by beaker on Mar 19, 2014 5:33:18 GMT -5
Hi all,
Just a quick hello and intro.
Firstly great site lots of interesting projects, info. Not much going on with home builds on other sites.
Have built quite a few engines over time, Pheonix mk3, wasp h1, KJ66, and partly built units and many pulse jets.
Have a new irking to build another, this time a J84. 22kg thrust
Not much info out there just lots of parts from Chinese suppliers turbine wheel, shaft, ngv, compressor.
As far as I know its a variant of the KJ66.
Just to get things moving along faster.
I know its my first post but I would like to know if anyone has any other info or even drawings/plans?
Happy to pay.
Will start posting pics soon.
Cheers
Beaker.
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Post by Johansson on Mar 19, 2014 7:47:15 GMT -5
Welcome Beaker! Always nice to see new DIY:ers here, make yourself at home.  Cheers! /Anders |
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Post by Richard OConnell on Mar 19, 2014 9:05:35 GMT -5
Hi Beaker and welcome! I wasn't able to find any useful documentation on the J84, just a lot of suppliers like you said and someone's homework assignment  |
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Post by Johansson on Mar 19, 2014 11:56:11 GMT -5
A wild idea perhaps, but why not design your own engine? The most successful Beaker-Jet Deluxe will be the given subject of admiration and awe at any party, decent gentlemen will turn into drooling admirers and women will name their babies after you.
Well, at least that was my expectation when I started building my JU-01. No luck of yet but one day my friend, one day..... *LOL*
Seriously though, with the combined knowledge gathered here you will be able to design and build one kick ass engine. Much more rewarding than "simply" building after plans.
Cheers!
/Anders
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Post by racket on Mar 19, 2014 15:46:21 GMT -5
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Post by racket on Mar 19, 2014 15:53:21 GMT -5
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beaker
Member
Joined: March 2014
Posts: 18
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Post by beaker on Mar 20, 2014 6:07:47 GMT -5
Thanks guys,
Racket, thanks for the heads up on the kamps book but I have it and many others.
Was a member of GTBA for many years But again I don't think much goes on there anymore. so cant justify the membership price!
Just thought of keeping it nice and easy with a tried and true engine but not any more.
Anders will take your advice. I like your idea with all the knowledge on the forum, two heads are better than one.
So I got parts on the way.
Now for some modeling.
Cheers
Beaker
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Post by Johansson on Mar 20, 2014 14:42:43 GMT -5
Wohoo! Go for it! |
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Post by racket on Mar 20, 2014 16:28:47 GMT -5
Hi Beaker
The Kamps book will be more than enough to get you there .
Looking forward to seeing what you make :-)
Cheers
John
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beaker
Member
Joined: March 2014
Posts: 18
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Post by beaker on Apr 3, 2014 5:32:55 GMT -5
Hi all, Just got my parts and now its time. Some dimensions, Compressor 63mm inducer 87.4mm exducer Turbine wheel 84.5mm Shaft length between bearings 145mm Some ideas i have are vaporizer tubes from the rear to front of combustion chamber. total diameter of engine 140mm combustion chamber Approx 125mm dia 130mm in length. Bearing spring preload on compressor side. Max rpm 100k Glow plug, air and motor start. Some things I have found around the net are, diffuser angle 13deg 13 wedges Will get some drawings on the way. what you think guys? Attachments:
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Post by racket on Apr 3, 2014 17:29:16 GMT -5
Nice shiny bits :-)
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beaker
Member
Joined: March 2014
Posts: 18
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Post by beaker on Apr 5, 2014 23:05:46 GMT -5
Preliminary drawing. Things have changed from what I said earlier. Bearing pre-load now from the rear. Shaft between bearings is now 100mm Lots more to come! Attachments:
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beaker
Member
Joined: March 2014
Posts: 18
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Post by beaker on Apr 9, 2014 6:29:28 GMT -5
Hey, Just a quick question. what is the purpose of the #6 2mm holes around the inside of the NGV? Don't think there pilot holes for screws. Also I had intentions of just letting the NGV float slightly back and forwards on the shaft tunnel without fastners . Starting to think I should screw shaft tunnel to NGV so there is no way for it to foul between turbine and NGV if it were to twist, Thoughts? Thanks Attachments:
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rythmnbls
Veteran Member
Joined: August 2011
Posts: 145
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Post by rythmnbls on Apr 9, 2014 6:39:36 GMT -5
They might be cooling holes, my last turbine was built with the NGV attached to the shaft tunnel and allowed to float relative to the case, if you do mount the NGV to the case and let the shaft tunnel float, you need to make sure the case is fairly rigid and square.
Regards.
Steve
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Post by racket on Apr 9, 2014 16:20:18 GMT -5
Yep , cooling air holes to stop hot gases getting down to the shaft tunnel , they'll also cool the turbine wheel .
From the look of your NGV with its outer flange , its a "floater" , alignment will require some accurate hole placements .
Cheers
John
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