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Feb 02, 2013, 05:59 AM
Heli nut " the wife said so "
holtneil's Avatar

sorry stupid question

hi all i need to ask this so sorry its a stupid question but when you look at helis to buy eg align t-trex they say 250,450,600.700 so this must be the size ? if it is is it cm or mm and where is the measurement taken from kind regards neil
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Feb 02, 2013, 06:16 AM
Registered User
I don't think so

Feb 02, 2013, 09:50 AM
Registered User
I've read somewhere the size is related to the length of the rotor blade. but there are a lot of exceptions to that thought.
Feb 02, 2013, 09:55 AM
Cranky old fart
Balr14's Avatar
The size was originally related to motor size required to power the heli when they used brushed motors, up to 500 size anyway. I tried to see if the size had any correlation to gas engine size 30 years ago but didn't find anything.

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