|
Post by racket on Nov 20, 2022 15:53:53 GMT -5
Hi Ron
LOL.......and we haven't reached V1 yet ;-)
Cheers John
|
|
slittlewing
Senior Member
Joined: November 2017
Posts: 458
|
Post by slittlewing on Nov 21, 2022 18:34:27 GMT -5
Patience pays off, glad your new shiny compressor finally arrived and meets a “loving home” 😁
Cheers Scott
|
|
|
Post by racket on Nov 21, 2022 19:31:42 GMT -5
Hi Scott
It was certainly made welcome :-)
Theres more work modifying things than making the original , but slowly getting through it , I think the front cover is OK , just need to reduce the diffuser vane heights down from 10.5mm to 7.5 mm and remachine the "corner", so I'll be needing to make up a mounting to hold the diffuser first .
Cheers John
|
|
|
Post by racket on Nov 24, 2022 19:31:18 GMT -5
Hi Guys
Rotor off to the balancing guy this afternoon :-)
Cheers John
|
|
|
Post by racket on Dec 1, 2022 18:32:04 GMT -5
Hi Guys Rotor has landed Time to get to work , its been 3 months since the last testrun . Cheers John
|
|
praendy2203
Veteran Member
Joined: August 2020
Posts: 160
|
Post by praendy2203 on Dec 2, 2022 13:22:20 GMT -5
Hi John,
good luck😊
Andy
|
|
|
Post by racket on Dec 2, 2022 15:14:09 GMT -5
Thanks Andy
The engine seems to be going together OK , back on the teststand today , hopefully a testrun next week :-)
Cheers John
|
|
|
Post by andym on Dec 3, 2022 14:45:45 GMT -5
So Looking forward to seeing it run again, very interested in seeing new numbers
|
|
|
Post by racket on Dec 4, 2022 1:45:20 GMT -5
Hi Andy Took it for a testrun , not that happy about the results :-( youtu.be/xbQMhw1tN-kSomething weird going on , comp effic is higher than previously so one would think that turb temps should be lower , but nope they're a lot hotter ,................ P4t is lower at relevant P2s ,and thrust is down by 20% , giving the appearance of an oversized jetnozzle , but oversized jetnozzles produce lower temps . Everything is the same as last test except for the comp and diffuser vane height , combustorand everything further back is original ...............time for some head scratching :-( Cheers John
|
|
|
Post by racket on Dec 4, 2022 2:28:49 GMT -5
And another one of a rather incompetant operator youtu.be/N4Kfpu63W2wNot enough prestart fuel pressure set , normally 15 psi is enough but not today , had to add a bit more on the second attempt , .............bloody starter was getting very hot to handle by the time she finally spooled up . Might need to blank off the surge slot , this more modern design will hopefully cope better , keeping my fingers crossed :-) One strange thing I noticed on the video was "bubbles" in the dump back to fuel tank , perhaps the high concentration of petrol on a 30 deg C day meant fuel vapour appearing when the fuel pressure dropped across the dump valve The learning process continues Cheers John
|
|
|
Post by andym on Dec 4, 2022 15:07:52 GMT -5
And another one of a rather incompetant operator youtu.be/N4Kfpu63W2wNot enough prestart fuel pressure set , normally 15 psi is enough but not today , had to add a bit more on the second attempt , .............bloody starter was getting very hot to handle by the time she finally spooled up . Might need to blank off the surge slot , this more modern design will hopefully cope better , keeping my fingers crossed :-) One strange thing I noticed on the video was "bubbles" in the dump back to fuel tank , perhaps the high concentration of petrol on a 30 deg C day meant fuel vapour appearing when the fuel pressure dropped across the dump valve The learning process continues Cheers John Nice work John, you having to fit a new comp wheel.... its still a beasty.... looking forward to seeing afterburner run.... Be interesting to see what happens when the anit surge slot is blank off.... have for now not included them, can add them if needed :-) So pleased to see it running again :-)
|
|
|
Post by racket on Dec 4, 2022 15:52:19 GMT -5
|
|
|
Post by madpatty on Dec 4, 2022 16:26:19 GMT -5
Cannot open the video. Says it’s private Regards
|
|
|
Post by racket on Dec 4, 2022 17:52:14 GMT -5
|
|
|
Post by madpatty on Dec 4, 2022 20:44:12 GMT -5
|
|