Search found 503 matches

by racketmotorman
Thu Mar 03, 2011 2:48 am
Forum: Valved pulsejet forum
Topic: Planing for next years speed weekend, (1/2 scale Argus)
Replies: 111
Views: 49695

Re: Planing for next years speed weekend, (1/2 scale Argus)

Hi Erik

Thats a professional finish ........... 8)

Beautiful

Cheers
John
by racketmotorman
Mon Feb 14, 2011 2:22 am
Forum: Gas turbine forum
Topic: TV94 TurboFan Build
Replies: 59
Views: 74000

Re: TV94 TurboFan Build

Hi Ash

Good to see you're back :-)

Have you checked out the new turbine Site http://jetandturbineowners.proboards.com/

Cheers
John
by racketmotorman
Mon Feb 14, 2011 12:32 am
Forum: Valved pulsejet forum
Topic: Planing for next years speed weekend, (1/2 scale Argus)
Replies: 111
Views: 49695

Re: Planing for next years speed weekend, (1/2 scale Argus)

Hi Jim

That is beautiful machining work , my congratulations on getting it finished :-))

Cheers
John
by racketmotorman
Fri Jan 28, 2011 10:09 pm
Forum: Jet Vehicles, All Types
Topic: Jet powered Lamborghini
Replies: 5
Views: 4470

Re: Jet powered Lamborghini

Hi Danny

You need a high pressure ratio across a CD nozzle to get shock rings , this engine wouldn't produce them , a CD nozzle would probably reduce performance in this case :-(

Cheers
John
by racketmotorman
Mon Jan 17, 2011 4:58 am
Forum: Valved pulsejet forum
Topic: fuel system
Replies: 3
Views: 2136

Re: fuel system

Hi What, me not be scientific ......cheeky bugger ;-)) ..................those are what I used http://www.youtube.com/watch?v=uqMn0A2aUdo Flow increases as the square root of pressure change , your 20psi and 0.125" oriface will flow the same as 100 psi and a 0.083" oriface , BUT , and its a very BIG...
by racketmotorman
Mon Jan 17, 2011 1:15 am
Forum: Valved pulsejet forum
Topic: fuel system
Replies: 3
Views: 2136

Re: fuel system

Hi

3/16" or 1/4" metal tubing for the line , Bosch EFI fuel pump , >20 GPH 90 degree solid pattern fuel spray nozzle .

Cheers
John
by racketmotorman
Wed Dec 29, 2010 12:42 am
Forum: Gas turbine forum
Topic: Looking for plans? Look here.
Replies: 9
Views: 17495

Re: Looking for plans? Look here.

Have you looked on Ebay ??
by racketmotorman
Mon Dec 13, 2010 9:26 pm
Forum: Unconventional, Multi-Mode and Hybrid Jets
Topic: VALVED pulse-jets with turbines (turbocharged pulse jet)
Replies: 7
Views: 5963

Re: VALVED pulse-jets with turbines (turbocharged pulse jet)

Hi Dan Mmmmmm, I thought I'd answered this Post , guess I didn't ....duh :-( Not a turbocharger type , it runs into "votex" problems requiring pressure drops etc , you need an axial turbine wheel that has impulse blading which doesn't require a pressure drop across the blades , the blades are best d...
by racketmotorman
Wed Dec 08, 2010 8:45 pm
Forum: Unconventional, Multi-Mode and Hybrid Jets
Topic: VALVED pulse-jets with turbines (turbocharged pulse jet)
Replies: 7
Views: 5963

Re: VALVED pulse-jets with turbines (turbocharged pulse jet)

Hi Dan By "radial" , I meant coming at the turbine wheel in a direction 90 degrees from the turbine shaft axis , it would end up being more a tangential sideways glancing blow to the blades. I doubt that you'd end up with enough horsepower to power a compressor sufficiently to make any great differe...
by racketmotorman
Wed Oct 27, 2010 3:49 am
Forum: Gas turbine forum
Topic: chamber combustion performance
Replies: 2
Views: 2534

Re: chamber combustion performance

Hi AGG

Make is as large as possible so that air velocities are low , crossectional area of the flametube to be at least 3 times the inducer area , your inducer has 1,885 sq mms , so the flametube needs 5657 sq mms or ~85mm dia if a single can type.

Cheers
John
by racketmotorman
Mon Oct 18, 2010 4:45 am
Forum: Gas turbine forum
Topic: GT 15 Gas Turbine by Adolph Saurer
Replies: 1
Views: 2465

Re: GT 15 Gas Turbine by Adolph Saurer

Hi

It might pay to ask the guys over on the JATO Site http://jetandturbineowners.proboards.com/ theres a larger number of guys who play with commercially produced turbine engines , one of them may know something .

Cheers
John
by racketmotorman
Wed Sep 29, 2010 5:06 am
Forum: Unconventional, Multi-Mode and Hybrid Jets
Topic: Motorjet -> KJ66 Compressor + Brushless motor
Replies: 9
Views: 6405

Re: Motorjet -> KJ66 Compressor + Brushless motor

Hi Daniel

See you over there :-)

Cheers
John
by racketmotorman
Tue Sep 28, 2010 8:17 pm
Forum: Unconventional, Multi-Mode and Hybrid Jets
Topic: Motorjet -> KJ66 Compressor + Brushless motor
Replies: 9
Views: 6405

Re: Motorjet -> KJ66 Compressor + Brushless motor

Hi Daniel An "afterburning" EDF will be a fuel burner , but there will be a thrust gain , you'll have to be careful about "thermal choking" because of the very low pressure ratio , the very fact that the temp will rise during combustion requires a static pressure drop as the air/gases expand and acc...
by racketmotorman
Tue Sep 28, 2010 12:08 am
Forum: Unconventional, Multi-Mode and Hybrid Jets
Topic: Motorjet -> KJ66 Compressor + Brushless motor
Replies: 9
Views: 6405

Re: Motorjet -> KJ66 Compressor + Brushless motor

Hi The EDF in the video will be producing a total pressure rise across its axial compressor ( fan) stage , not as high a total pressure rise as you would get with a centrifical comp (KJ66), but thrust output has a square root component of pressure , so more horsepower required per pound of thrust , ...
by racketmotorman
Wed Jul 14, 2010 2:40 am
Forum: Unconventional, Multi-Mode and Hybrid Jets
Topic: Motor jet, afterburning EDF
Replies: 4
Views: 4251

Re: Motor jet, afterburning EDF

Hi Axel LOL.....very enjoyable :-)) We only need air speeds of <400 ft/sec at the afterburner inlet to have stable combustion , easily achieved ........................there would need to be careful consideration made as to the "best" EDF , preferably more of a "low speed" unit rather than something...