RE: JetJoe OWNERS thread

RE: JetJoe OWNERS thread
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RE: JetJoe OWNERS thread - 5/7/2005 8:09:16 PM

heliweb

Posts: 8
Joined: 1/9/2005
From: Santiago, CHILE
Status: offline

Someone could explain or show a picture of bearing preload system used by JetJoe engines

(in reply to rcdriver22)

Post #: 76

RE: JetJoe OWNERS thread - 5/7/2005 10:47:15 PM

gregmax

Posts: 245
Joined: 9/15/2003
From: London, UNITED KINGDOM
Status: offline

On my JJ1400 the shaft tunnel contains 2 groves that house O rings at either end where the bearing seat is. These O rings rest against the bearing quite tightly and dampen their movement fore and aft.
At the front of the shaft tunnel there is a spring retained by a circlip seated in a groove just after the rear of the front bearing, this circlip also presumably stops the front bearing being pushed too far down the shaft tunnel. Next is a thin walled tube that sits inside the shaft tunnel and rest against the spring at the front bearing end and sits against the rear face of the rear bearing.
When the shaft is inserted into the shaft tunnel and the spinner nut tightened this compresses the spring inside the shaft tunnel thus producing the bearing preload.
Exactly the same system as used by other manufactures but the other manufactures do not use the O ring anymore as the O ring can cause problems.
Hope this explains it to you?

Greg

(in reply to heliweb)

Post #: 77

RE: JetJoe OWNERS thread - 5/7/2005 10:50:31 PM

rcdriver22

Posts: 508
Joined: 10/31/2004
From: Newcastle, UNITED KINGDOM
Status: offline

quote:

ORIGINAL: heliweb

Someone could explain or show a picture of bearing preload system used by JetJoe engines

In 1999? some homebuilders found a preload helped the bearings and the expensive ceramic bearings contain concentric and misalignment on shaft with expensive ceramic ungaged bearings live long with the shaft a 120k revs i,e very high revs.

See gregs photo
http://www.rcuniverse.com/forum/upfiles/68266/Ys49507.jpg

i.e. 1200 low life,
JJ1400 pre load bearings long life. OK

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(in reply to heliweb)

Post #: 78

RE: JetJoe OWNERS thread - 5/7/2005 11:35:55 PM

turn and burn

Posts: 289
Joined: 12/29/2003
From: flintshire, UNITED KINGDOM
Status: offline

andy will be at the blackpool jet meet tomorrow with his jj if any one wants to see one .i will not be there wife is due to have our babby any day now

(in reply to rcdriver22)

Post #: 79

RE: JetJoe OWNERS thread - 5/8/2005 12:07:17 AM

angturbines

Posts: 23
Joined: 4/15/2004
From: anglesey, UNITED KINGDOM
Status: offline

Hi All,
The cc is located on the NGV but not a tight fit , the only real means of keeping the cc in the correct position is with the plug. If the fuel and gas lines are not quite set in the correct form when the plug is removed then the cc will move slightly , If you are building your engine from a kit then you need to make sure that the fuel and gas lines are not stretched or they will cause the cc to move when the plug is removed.Two plugs would give a positive location but it is not usully a problem,

(in reply to turn and burn)

Post #: 80

RE: JetJoe OWNERS thread - 5/8/2005 12:24:02 AM

J. Campbell

Posts: 659
Joined: 10/27/2002
From: Bowling Green , KY, USA
Status: offline

You can retrofit the pre-load to the 1200, when you order one, ask and it will be factory supplied with a pre-load. Russ

(in reply to angturbines )

Post #: 81

RE: JetJoe OWNERS thread - 5/8/2005 1:02:59 PM

rcdriver22

Posts: 508
Joined: 10/31/2004
From: Newcastle, UNITED KINGDOM
Status: offline

quote:

ORIGINAL: J Campbell

You can retrofit the pre-load to the 1200, when you order one, ask and it will be factory supplied with a pre-load. Russ

Cheers Russ

Forgot it is readily available as either a retro fit or as an order item for the pre-load. Just about mandatory for any constant use. No other commercial manufacturer, as far as I know, offers any turbines without a pre load today.

It is raining and hailstones so I'm grounded till it clears in the UK. So no test flight of the jets today. I'll get the Hawk moved on and start some jobs in the workshop.

Paul

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(in reply to J. Campbell)

Post #: 82

RE: JetJoe OWNERS thread - 5/10/2005 3:28:27 PM

angturbines

Posts: 23
Joined: 4/15/2004
From: anglesey, UNITED KINGDOM
Status: offline

Hi All,
The o ring is not to dampen the for and aft movement so much as to stop the outer cage rotating, the bearing should have a nice sliding fit in the tunnel and should not be tight,lf any tightness exists then the bearing will stick.

(in reply to rcdriver22)

Post #: 83

RE: JetJoe OWNERS thread - 5/11/2005 4:58:51 AM

ltdorn1

Posts: 60
Joined: 7/11/2003
From: Monterey, CA, USA
Status: offline

where can i buy a JJ or at least see a price list?

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(in reply to turn and burn)

Post #: 84

RE: JetJoe OWNERS thread - 5/11/2005 8:36:00 AM

rcdriver22

Posts: 508
Joined: 10/31/2004
From: Newcastle, UNITED KINGDOM
Status: offline

quote:

ORIGINAL: ltdorn1

where can i buy a JJ or at least see a price list?

www.jetjoe.com

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Post #: 85

RE: JetJoe OWNERS thread - 5/11/2005 10:06:19 PM

j_rc_heliman

Posts: 22
Joined: 5/5/2003
From: Sparks, NV, USA
Status: offline

hey guys i need some help. I accidentally reset my startup parameters in my GB Hobbies ECU and I am trying to do some more test runs on my jj-1200. When i try and start the turbine it spools up to about 18000 rpm and then hangs there running on both propane and kero until it over temps. I set my idle rps to 32k so it just sitts there in startup ramping mode. I think maybe my start ramp value may be causing this. Or perhaps the krappy JJ pump may be giving out on me. does anybody have any ideas?

thanks

(in reply to rcdriver22)

Post #: 86

RE: JetJoe OWNERS thread - 5/11/2005 10:15:08 PM

turn and burn

Posts: 289
Joined: 12/29/2003
From: flintshire, UNITED KINGDOM
Status: offline

my setting are you may need to play a little with this .
full power speed 160.000
idle speed 47.ooo
stop speed 21.ooo
start temp 100c
max temp 800c
acceleration delay020
stability delay 015
pump start point auto+1
pump start ramp004
that is with my jj pump hope this helps

(in reply to j_rc_heliman)

Post #: 87

RE: JetJoe OWNERS thread - 5/11/2005 10:24:06 PM

J. Campbell

Posts: 659
Joined: 10/27/2002
From: Bowling Green , KY, USA
Status: offline

In my personal experience when or if the JJ pump goes out, it will always obtain Idle but not full power. You Kero ramp is probably not fast enough thus causing the engine not to obtain idle. Russ

(in reply to turn and burn)

Post #: 88

RE: JetJoe OWNERS thread - 5/12/2005 2:28:39 AM

j_rc_heliman

Posts: 22
Joined: 5/5/2003
From: Sparks, NV, USA
Status: offline

thanks for the input guys.. is there a easy way to check whether to use 1 or 2 pulses per rev? i had thought that jj-1200 had a magnet for 2 pulses per rev, but maybe i am mistaken. I have the remote hall sensor that i bought seperate from Moores Turbines that usually comes with the espiell fadec (although im us