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Post by britishrocket on Dec 21, 2023 13:35:37 GMT -5
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Post by britishrocket on Dec 21, 2023 15:52:46 GMT -5
Just a brief errata for my video above. At 25 minute mark I convert some kW figures to HP. 9.5 kW should be 13hp and 28.5kW should be 38hp. These figures do not affect the overall result.
Cheers!
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Post by racket on Dec 21, 2023 16:41:19 GMT -5
Hi Carl
You may need to revisit your max fuel burn number , 7.5 cubic meteres/hr might be a tad shy due to your 3.75 times mass flow increase between idle and full power , though I feel you'll be fortunate to get even a doubling of air , a lot will depend on the turb stage scroll housing A/R and its Corrected Flow .
You may need 12 radial holes in the injector , 2 rows of 6 to provide a more even spread of fuel, a 2"inducer turbo burns a lot of propane , generally at the limit of what a 20 lb BBQ cylinder will supply .
Another great video , LOL..........you might convert me to SI units ;-)
Have a great Christmas , I'll be waiting for the next one :-)
Cheers
John
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Post by britishrocket on Dec 31, 2023 13:50:41 GMT -5
Thank you John.
I will definitely take another look at the fuel calculation.
I used to use imperial units to do this type of calculation because a lot of the books I have are from the 1950s. I prefer older editions of such books since they were produced when the technologies were in their infancy, so the approach is straightforward and amenable to amateurs like me.
I found though that I became exasperated with all of the constant unit conversion and the alphabet soup of imperial thermodynamic units. So I switched over to SI, which was of course intended to obviate any such troubles.
Happy New Year to you. Of course in Australia you may already be in it by the time you read this.
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richardm
Senior Member
Joined: June 2022
Posts: 411
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Post by richardm on Dec 31, 2023 15:05:35 GMT -5
Ha Ha! Try Canada ! A mixture of SI and I mperial plus some Us units..Not just a soup, a full meal!... Pounds to kilograms to liters to imperial gallon ..or is it US gallon ? ...Remember the Gimli glider?
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Post by racket on Dec 31, 2023 16:40:02 GMT -5
Hi Richard
Same here in Oz , 60 years ago when I was in school it was Imperial , no sooner than I was in the workforce we changed to Metric , they said they'd get rid of Imperial , but we still buy Whitworth threaded bolts in Imperial sizes some 50 years later , the sea tide heights are in metric but wave heights for surfers are still in feet............it keeps our brains "nimble??" :-)
Cheers
John
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Post by racket on Dec 31, 2023 16:51:21 GMT -5
Hi Carl
With propane its probably better to stick to weight rather than volumes as fuel burn rate measurements can be done by simply sitting the cylinder on some scales, whereas volumes , especially as delivery pressures will change , are going to be impossible to measure, also if we keep both fuel and air in the same units it helps with F/A ratios .
Yep , a Happy New Year to you guys in the UK , only another couple of hours to go , we've woken to a very quiet New Years Day after fireworks that seemed to go on all night , there'll be some sore heads when they wake up :-)
Cheers
John
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Post by britishrocket on Jan 1, 2024 8:08:10 GMT -5
Have a great new year. Thanks for the info re propane. The UK is the same. As the originators and exporters of the Imperial system (ie the system used throughout the empire) we also use both.
We supposedly went metric in 1973 so being born in '70 I was taught metric at school. My parents, Grandparents and family all still talked in imperial. Engineering training in metric then worked on imperial aircraft for years...in my work now it's metric but I still use imperial in the home shop. Depends what I'm working on.
Prefer metric/SI for calcs as noted. Now in the UK post Brexit there is a lobby to go back to Imperial!
Fraternal greetings to you all and a massive happy New year I hope it's a good one.
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richardm
Senior Member
Joined: June 2022
Posts: 411
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Post by richardm on Jan 1, 2024 9:33:19 GMT -5
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