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[KBIO]

Good evening!
Can anybody tell me what is the amount of gas passing ( gr or cft) through n°8 Stuart jet per hour?
Is it double amount for N°16 Stuart jet?
I am using   70%but/30%prop
Thanks for your help!
Sincerly

[flashtwo]

Hi,

I always weigh my gas cylinder on digital scales, do a burn for exactly 5 or 10 minutes , then weigh the cylinder again; it is then easy to calculate the consumption per minute.

When I run the boat on the pond, I note the before and after cylinder weight and divide the difference by the time of the run. I'm using about 4 grams/minute.

The actual consumption depends on the state of the cylinder and its temperature and pressure so, to be consistant, the start weight and temperature should be about the same for each test.

The best that I've found out about jet sizing is that it is to do with the old petrol carboretor. A container would be filled with a liquid to a given level and then allowed to drain through the jet. The time taken for the level to drop would be noted and the jet assigned the size number.

Ian

[KBIO]

Hello !
Thank you for your answer, Ian.
You are right, this could be a way to know, the gas consumption in a particular environment;
But I thought that manufacturers would have had a simple figure at standards conditions to inform us of the capacity of a burner.
For exemple on the bottles of camping gas, they say that the burner is : 130 gr/hr.      (20°C - 1Atm)
In fact I ask, because I want to know if my  N°16 jet is enough for my boiler = 1.25 lit of eff volume / 3 lit total vol..
regards!

[flashtwo]

Hi, I've found this discussion:-

http://www.homemodelenginemachinist.com/index.php?topic=11336.0

Because of all the different conditions, I will still weigh the cylinder and then you know for sure.

Ian.

[KBIO]

Good evening Ian!
Thanks for the last post. It will make it. 
I do not need to be tiptop accurate and a close idea will be good enough to see if my burner is out of picture or not.
Thnaks again
Cheers!

[TAG]

I knew I had some figures on gas consumption which I have just found in the dining room clear up for Christmas (I tend to use it as an office). They are for a No8 jet and are as follows 78grams were consumed in 45 minutes, hope this may be of some use to you.
Tim

[Reg Hinnant]

BIX gas tanks literature has some guidence figures by jet size.
http://www.forest-classics.co.uk/Catalogue/BIX-Gas-Tanks-Large.pdf

[livesteam]

Hi there!
Does Anybody knows what GasJet was used at the burner of the Cheddar Pipit (same as Compact) boiler? It's a 3/4 inch diameter burner nad I guess it could be Jet No 5, but I am not sure and need to replace it.
Cheers!

[cuppa]

Hi Livesteam

I believe the pipit burner used a no 8 jet.

Cheers
          Jon