Author Topic: mini steam car  (Read 798 times)

SandyC

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Re: mini steam car
« Reply #60 on: May 18, 2019, 05:19:22 pm »
. Can anyone tell me how small can a burner/boiler be that will run for 5mins

Hi Ron,
The size of a boiler required to run for 5 minutes can only be determined of the following are known: -
a/ The total swept volume of the engine being run by the boiler.
b/ The rpm of the engine.
c/ The working pressure of the boiler.

These 3 items will determine the amount of water which needs to be evaporated at the working pressure for a 5 minute run time.**

Once the amount of water required is known then the amount of heat (in Btu's) required to perform the evaporation rate can be determined which, once known, can then be used to calculate the amount of fuel (Meths) that will be needed to run for 5 minutes... which in turn will determine the number and size of flames required.

It's all a matter of balancing the output requirements with the input required to achieve the desired results and  also allow for losses, of which there will be a good few.

It is not really possible to just pick a size and expect it all to work unless you are very very lucky.

So, more info will be required in order to work things out properly.

One or two things to note... 1/ **A boiler should never be run completely dry, so it must hold more water than actually required... 2/ The amount of fuel provided should always run out before the boiler water.

I do like the project you are working on and I am sure it can be made to work as desired, but some extra math is going to need to be done I am afraid if you are to get the best results from your efforts.
If I can help with that then don't be afraid to ask.

From your last post I would suggest you only put 1.25- 1.5 mils of meths in the burner and see how long that runs for.

I hope this is of some help.

Best regards.

Sandy.
SandyC      West Coast of Scotland.
“Don’t think about your errors or failures; otherwise, you’ll never do a thing.” Bill Murray.

RON

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Re: mini steam car
« Reply #61 on: May 19, 2019, 05:59:31 am »
Sandy many thanks for your excellent response twice now i have posted a reply and i get error occurred or no permission and so on maybe i`m taking too long to reply

RON

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Re: mini steam car
« Reply #62 on: May 19, 2019, 06:04:32 am »
Sent message to moderator will get back to you another day really makes me angry

oilfield_steam

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Re: mini steam car
« Reply #63 on: May 19, 2019, 08:00:27 am »
Hi RON,

Sent you a PM.  I hope we can resolve this issue quickly and to your satisfaction.

Regards,

Scott
The Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines Team
Scott

RON

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Re: mini steam car
« Reply #64 on: May 20, 2019, 04:38:00 am »
Sandy once again thanks for your input have sent PM to Scott so let`s hope this works have cooled down a little.  Have a look at #33 of this post and you will see the boiler steamed up after 2mins using a different burner now it takes 6mins so i think the problem must lye with the burner i.e. heat output. Think i will put the steam side on hold not the end of the world but certainly a setback really need more trials. Will crack on with the body shell meaning more formers and templates need to be made at least i`m miles ahead of where i was a month ago. Would have liked to introduced fwd/rev but not sure if it can be done with this engine so you see still lots to think about. I`m at the stage when i watch the telly i see moving pictures but my brain is on another planet.

RON

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Re: mini steam car
« Reply #65 on: May 25, 2019, 08:28:11 am »
Bonnet/hood
I thought the first place to start was to make a former
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Simply bent round the former the only mistake i made i should have softened the brass first it was a bit springy
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The front was soldered with lead free solder the side with silver solder was going to try and beat it round a former like boiler end caps but thought this way much neater
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Now the hard bit what shell to choose the r/x will fit any but i don`t know the battery dimensions
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So you see it`s really hard to choose the first t/x i had was valve operated the r/x was reed operated both home made ( forget from which mag it came from ) since moved on but still my radio gear is quite old will need to hunt the net to see if there is any mini stuff so will really need to think hard

Stoker

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Re: mini steam car
« Reply #66 on: May 25, 2019, 09:19:55 am »
Oooooh I do love that Contractor's Van and the great room it would give for accommodating ..... well, most anything really, from boilers to R/C gear. I also like the flywheel peeking out from under the frame between the wheels.

Meanwhile I really love the sedan that you are attempting, and the challenges of not having all that extra space.
Wherever you go ..... there you are!

RON

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Re: mini steam car
« Reply #67 on: May 26, 2019, 09:59:58 am »
I know this is a steam forum but just a quickie checked out my radio gear thought it was up in my attic but instead in a drawer at my feet 8 transmitters  receivers don`t ask
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So you can see these will fit but feel ashamed to use 7 channel when i only need two
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3rd photo shows my setup when i did some indoor flying last one shows spare one in a box and there both 2 channel the servos are even smaller than the ones i have fitted on the platform
So i think i`m OK for gear ballsed up the photos

 

Stoker

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Re: mini steam car
« Reply #68 on: May 26, 2019, 11:40:26 am »
Looks like you are set to go with R/C gear, but do check with the regs regarding what use each frequency can be used for, and realize that you can be liable for damages should you turn your system on and crash someone else's model as a result.

You are likely fully aware of this, but offered just in case you are not.
Wherever you go ..... there you are!

Jim

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Re: mini steam car
« Reply #69 on: May 26, 2019, 07:49:12 pm »
Keep the photos coming Ron.
_______________________________________________
Jim
South Coast of New South Wales Australia

Nick

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Re: mini steam car
« Reply #70 on: May 26, 2019, 10:02:09 pm »
Quote
Now the hard bit what shell to choose...

I will make it easy for you  ;)  Build all three!  :D :D
Nick

RON

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Re: mini steam car
« Reply #71 on: May 27, 2019, 04:37:31 am »
Nick you are a hard man the problem with building multiple cars is the wheels i know for some people they find it easy for me i`m not that good.                                                                                                                                     Truthfully  what i would like to see is someone else having a go there are people out there who can take this to another level the concept is really simple and i think within most peoples abilities but when it comes to steam i`m really the stage before the novice would be nice for others to have a go if they like model cars and show me how i can make fwd/rev. really such a nice engine you only have to touch the flywheel and away it goes so would be really nice if someone has the same engine and let us know if self start is possible. A lot on this week finding time a bit tricky
Regards
RON
P.S. if anyone needs any sizes just ask                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       

frazer heslop

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Re: mini steam car
« Reply #72 on: May 27, 2019, 04:44:31 pm »
If its a single acting engine it wont self start without some form of mechanical aid along the lines of the French Typhoon engine
Some drawings on this site in the marine section its just a simple disc type of controller it will give forward/reverse and speed from one servo
http://www.vapeur45.fr/chaloupe-a-vapeur/presentation-moteur

RON

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Re: mini steam car
« Reply #73 on: May 28, 2019, 03:58:00 am »
Frazer once again to the rescue not quite sure what is happening looks like two single acting cylinders with a controller on top. I do understand a DOUBLE acting TWIN will self start but that`s about it.  This engine i`m using is not an oscillating one i think the porting is in the shaft and i thought something that you are showing ( first time i have seen it )might be the answer.  Maybe i`m dreaming but i think i saw somewhere maybe same site someone made a device that flicked the flywheel extra servo ?.  Would be nice if someone had the gear and tried it and let us know i don`t have that type of gear yet reason for popping the question is really i`m trying to think ahead still a long way to go.
Once again many thanks
Best regards

frazer heslop

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Re: mini steam car
« Reply #74 on: May 28, 2019, 11:11:31 am »