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  • June 19, 2018, 06:05:23 PM

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Author Topic: The 19th Century ' Rubber Band ' motive power .  (Read 241 times)

Offline Matt Spencer

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The 19th Century ' Rubber Band ' motive power .
« on: April 21, 2018, 07:04:20 AM »
Anyone ever tried a Rubber Powered Control Line Ship ? Tried a few stunts with it ?

Would it be possable now with some electric limiter / goveoner , somewhat like Igors ' G ' thingo ,
to get a big grunty rubber band motor to ' tick over ' for 6 1/2 minutes , maybe coasting downhill .  :-\

Some huge ultra light models what Id have thought , maybe a C F ( Helicopter boom ? ) Motor / Fuse Crutch ,
a wing spar , the rest pretty much ultra  light F F type costruction .

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The Olde Morane , eindeker , Tabloid , Bristol Scout & suchlike , or thereabouts . Perhaps.
Old Comet Rubber F2B at 400% would be 60 inch span .

just a thought , thinking it might now be achievable , even if multiple sequetial ' motor tubes ' for flight duration .
any Wakefiels of FF rubber buffs know some sums on output/ duation etc . . .

Turn of the century there was a 6 ft span Folkerts FF Rubber thing with a 24 inch prop , Fairly basic lines for strength to weight .
naff All Weight , naff all load at high G square turns . Deadly serious on this .

supose someone will tell us the price of Perelli Rubber & we'll go into cardiac arest .  >:(


flogged from Outerzone




or some other hieneous contraption .  :-\


Online Tim Wescott

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Re: The 19th Century ' Rubber Band ' motive power .
« Reply #1 on: April 21, 2018, 07:28:38 PM »
Methanol specific energy: roughly 50MJ/kg (Mega Joule, from Wikipedia).
LiPo specific energy: roughly 500kJ/kg (From Wikipedia).
Twisted rubber band specific energy: roughly 6.6kJ/kg (from Wired, of all places).

So, no.  A rubber band would have to weigh about 75 times more than a LiPo to have the same energy, and then the plane would weigh too much.
AMA 64232

The problem with electric is that once you get the smoke generator and sound system installed, the plane is too heavy.


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