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Blackhorse CAP 232 180

  • Klipkopwildlife
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06 Oct 2012 12:07 #61 by Klipkopwildlife
Replied by Klipkopwildlife on topic Re: Blackhorse CAP 232 180
Even glow engines converted to Petrol seem to vibrate more than they did, go figure!
Do it now, you may never get another chance

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06 Oct 2012 15:24 #62 by The Beard
Replied by The Beard on topic Re: Blackhorse CAP 232 180
Must be a bigger bang

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06 Oct 2012 17:53 #63 by Eric
Replied by Eric on topic Re: Blackhorse CAP 232 180
One for the scientists - does methanol vapour under pressure burn faster or slower than petrol vapour under pressure?
if you are calm and collected when all about you are going berserk - you've missed something important!

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06 Oct 2012 18:22 - 08 Oct 2012 10:03 #64 by Phil Wood
Replied by Phil Wood on topic Re: Blackhorse CAP 232 180

Eric wrote: One for the scientists - does methanol vapour under pressure burn faster or slower than petrol vapour under pressure?

Can't be certain without doing a lot of thermodynamic calculations Eric, but I'm fairly sure petrol will burn slower.
Petrol contains additives to make it burn slower .... this used to be in the form of lead compounds.
They do this so that the pistons in car engines get a slow continuous push down the bore rather than a sudden clout at the top of the stroke.

Pol.
Edit .... This post is wrong .... I've corrected myself a few posts down.
I just own the forum .... you guys make it great thanks.
Last edit: 08 Oct 2012 10:03 by Phil Wood.

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06 Oct 2012 22:06 #65 by The Beard
Replied by The Beard on topic Re: Blackhorse CAP 232 180
There not as powerful as glow engines are they,are petrol engines 2 stroke,there noisier arent they.

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07 Oct 2012 19:14 #66 by Klipkopwildlife
Replied by Klipkopwildlife on topic Re: Blackhorse CAP 232 180
I'm under correction here, but Petrol engines generally need less compression than Methanol, one of the things you have to do when converting is reduce the Compression ratio. When converting cars to run on Meth you generally have to give it masses of extra advance which would mean that Meth burns slower.
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08 Oct 2012 09:49 #67 by Phil Wood
Replied by Phil Wood on topic Re: Blackhorse CAP 232 180

Klipkopwildlife wrote: I'm under correction here, but Petrol engines generally need less compression than Methanol, one of the things you have to do when converting is reduce the Compression ratio. When converting cars to run on Meth you generally have to give it masses of extra advance which would mean that Meth burns slower.

You could be correct Klippy, I'm just guessing that petrol is deliberately slowed down .... I suppose the different compression ratio and ignition timing might be down to a different ignition temperature, flash point or fire point ....
en.wikipedia.org/wiki/Flash_point
If I can find the time I'll look into it further.
I just own the forum .... you guys make it great thanks.

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08 Oct 2012 09:58 #68 by Phil Wood
Replied by Phil Wood on topic Re: Blackhorse CAP 232 180
You are very much correct Klippy ... I shall go to the back of the class & hang my head in shame.... I hope my old chemistry tutor doesn't read this. :(
"Methanol is far more difficult to ignite than gasoline and burns about 60% slower"
en.wikipedia.org/wiki/Methanol_fuel
I just own the forum .... you guys make it great thanks.
Thanks: Klipkopwildlife

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16 Oct 2012 00:50 #69 by THE BLACKBIRD
Replied by THE BLACKBIRD on topic Re: Blackhorse CAP 232 180
It would seem the Moki 180 is a little underpowered for the Cap 232 it just will not hold the vertical prop hang, im up to a 18x8 prop but want to try an 18x10 or even 18x12 to see if i can get that little bit extra from it
But cannot find a APC prop that size, anybody know where i can get them :( :(

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16 Oct 2012 01:31 #70 by Eric
Replied by Eric on topic Re: Blackhorse CAP 232 180
If it seems to be under-powered, you might be over-propping it. Come down an inch in diameter, and see if it helps!
if you are calm and collected when all about you are going berserk - you've missed something important!

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16 Oct 2012 10:59 #71 by THE BLACKBIRD
Replied by THE BLACKBIRD on topic Re: Blackhorse CAP 232 180
Tried the 17" props the 18" are better, had a 18x10 wood one on for one flight but i dont think it was a good one did not work to well, and broke it on landing,

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19 Oct 2012 13:41 #72 by THE BLACKBIRD
Replied by THE BLACKBIRD on topic Re: Blackhorse CAP 232 180
Cant find any 18x10 props so i have taken 150g from the cap so ill see if it makes any difference

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19 Oct 2012 14:53 #73 by old fart
Replied by old fart on topic Re: Blackhorse CAP 232 180
Try a 20x8 or 6. :)
There is nothing like a dream to create the future.

Electrickery is the work of the devil.

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19 Oct 2012 14:59 #74 by Klipkopwildlife
Replied by Klipkopwildlife on topic Re: Blackhorse CAP 232 180
I don't think BB can, he'll have a dragon, prop dragon on the ground!:)
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20 Oct 2012 15:33 #75 by THE BLACKBIRD
Replied by THE BLACKBIRD on topic Re: Blackhorse CAP 232 180
I was in the pits with the Moki ticking over just about to wheel it out to the flight line WHEN FOR NO REASON AT ALL AND ALL ON IT'S OWN IT REVED UP AND ALL THE CONTROL SURFACES WERE FLAPING ABOUT it last for 3/4 seconds then went back to normal.
I did another range check and everything seemed ok so i flew it , no problems im pleased to say
But a bit off putting after all thats gone on :unsure: :unsure:

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