ST-50 build

[stevie]

Hiya,
Building a ST-50 Kart. Had a burner nozzle question.
The Delevan Variflow was hard to find. I got a Monarch bypass nozzle, 80 degree cone, 17GPH. Bosch 044 pump.
Are ya'll using the bypass on these with the manufactures adapter or just bypassing the bypass and using a separate reg to supply the pressure to the nozzle?

[racket]

Hi

Better to use the bypass as your atomisation at lower fuel flows will be finer

Cheers
John

[stevie]

Thanks as always,
Steve

[wannabebuilderuk]

A fellow Rhino user, very nice 😁

[ausjet]

I’m using the manufactures adaptor. Have a read of my recent posts regarding testing of my bypass nozzle. I haven’t found a way to set the idle using a bypass nozzle. It’s just going to be what the nozzle specs are on full bypass.

r.tapatalk.com/shareLink/topic?share_fid=93183&share_tid=966&url=https%3A%2F%2Fjetandturbineowners%2Eproboards%2Ecom%2Fthread%2F966&share_type=t&link_source=app

[racket]

With roughly a 5:1 turn down ratio it should be more than adequate , our engines use a lot of fuel at idle

[stevie]

What is the wall thickness of the flame tube and AB case you all are generally using? Around .1? .0625? I looked around and it seems to be within that realm. I'm going to try and not try and roll as many straight tubes as possible. I have access to a laser that can cut all that stuff. The cones on the other hand should be fun
Parts are streaming in but just getting the kart ready for this has it's own challenges. As most of you know.
Fun.

Steve

[racket]

Hi Steve

1-1.2 mm - 0.040-0.048" stainless sheet for flametubes , afterburners only have several psi of static pressure even though running a lot hotter , similar thickness should be OK but up to 1.5mm - 0.060" max

Cheers
John

[stevie]

Huge help Thank you. 18ga sheet it is, I think we will have no problem rolling this into a tube and TIG it. 



Steve

[racket]

Yep , much easier to TIG if not too thin

[stevie]

Yeah, my shopmate who TIGs just shot me a pretty evil stare. Quickly changed to a smile, "Then again, how many times I have I done this to you though?"
I turned back to the VF2 control panel and pressed cycle start.

Steve.

[stevie]

Ok here we go.

[racket]

Lotsa nice shiny bits :-)

[stevie]

Not for long.

I measured the fire extinguisher I planned on using (but will not) and it's around .027-ish. The stainless sheet I got is .025-ish 24ga, looks like it will be fine but? We will see. I asked my shopmate to teach me tig instead of him just taking care of it. Shouldn't be a problem and always nice to learn something. He's not giving me dirty looks any more (j/k best of pals) and I have a bunch of rems to practice on. Start with something thicker he says. I can mig thin stuff like band saw blades but this of course is different. I'm ok with that.
Steve

[turboron]

stevie, simple pressure vessel stress calculation is the boiler code. If you have p = pressure in psig, t = thichness in inches and r = radius in inches then stress in psi is equal to s = pr/t. So if you have 50 psig in the vessel, a thickness of 0.027" and a radius of 3" then s = 50*3)/(0.027") = 5,555 psi. The thickness should be okay from a stress standpoint. However, from a welding/fabrication stand point a higher thickness is probably a good thing.

Thanks, Ron