Flying a (steaming) kite

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Mike Rometer
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Re: Flying a (steaming) kite

Post by Mike Rometer » Sun Jun 28, 2020 9:02 am

Mike, a lot will depend on the type of bender employed, some cheaper one are definitely not up to muster, it needs one with a supporting die on the outside of the bend, such as, https://rothenberger.com/ae-en/pipe-ben ... ender.html. It isn't a good idea to bend too close to the open end of a pipe anyway, so leave it over-length and re-cut after. As insurance you could also add a plumbers type bending spring to support the shape, though they can come with their own problems, like getting stuck if the bend is too tight. Also as long as the expander will go in it should take care of any minor imperfection to the 'round'.

I like the idea that if you need more output, just add more tubes and make it longer.
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RNoe
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Re: Flying a (steaming) kite

Post by RNoe » Sun Jun 28, 2020 3:09 pm

I'm with Mike.
I'm also in favor of the simplicity of a VFT for "hobby" steaming, despite the improved efficiency offered by that more complex design.
I see the need for at least 8 different bending jigs to make that boiler design.
Not so much a Home Shop operation.
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Re: Flying a (steaming) kite

Post by Mike Rometer » Sun Jun 28, 2020 5:14 pm

RNoe wrote:
Sun Jun 28, 2020 3:09 pm
I'm with Mike.
I'm also in favor of the simplicity of a VFT for "hobby" steaming, despite the improved efficiency offered by that more complex design.
I see the need for at least 8 different bending jigs to make that boiler design.
Not so much a Home Shop operation.
RussN
Or one, multi-purpose, adjustable one?

I was thinking a board with moveable pegs. Still quite a job to construct. :(
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Re: Flying a (steaming) kite

Post by PeteThePen1 » Mon Jun 29, 2020 10:09 am

Yes, I think that the six different pipe shapes are a bit of an issue.

However, Mike R has a point about a basic board to which one could add a lever with several mounting points for the bend wheel (if that is its correct name). Bearing in mind that steamboating is a very co-operative hobby, I would have thought that a design for such a jig could be developed by discussion and then built and passed on when the individual has finished his/her bending. Of course the other possibility is a team working together where one person bends all the pipes for everybody (ouch!) while another drills all the drums for everybody and so on. That is what a team in Australia have done to make some John King 3 drum boilers.

I think the bending boards would be relatively easy to make by somebody with good woodworking skills. The boards could be made up of multiple strips of (say) oak for long life, would be easily cut to the design curves and could be easily channeled with a palm router and a half round cutter.

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Re: Flying a (steaming) kite

Post by fredrosse » Mon Jun 29, 2020 2:57 pm

".......Also as long as the expander will go in it should take care of any minor imperfection to the 'round'."

The rules for tube expansion require a tube insertion hole that is only a couple of thousanths (human hair diameter) larger than ther tube outside diameter. Getting an "out of round" tube into a close diameter hole is the issue, not rolling the tube after it is inserted.
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Re: Flying a (steaming) kite

Post by Lopez Mike » Mon Jun 29, 2020 5:02 pm

Hasn't this been done with screw in flare fittings or some such solution? That would take care of the slightly out of round tube issue. Or is the wall thickness of these recommended tubes too much for flaring? Or is a flare fitting not allowed inside for a boiler.

I've certainly had a flare fitting fail by cracking due to vibration on my steam pipe. It was right out of the scene inThe African Queen only I didn't try to wrap a rag around it! I just throttled the engine with the isolation valve at the boiler and left my throttle valve at the engine wide open. That way the failure point had much reduced pressure and I could limp home with only my foolish pride scalded. Got on the web that night and ordered a flexible steam hose forthwith!
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