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04-25-2011 02:57 AM  7 years agoPost 1
Benth

rrApprentice

New London Ct

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Ok so I'm going to convert my customers 600se to a normal 600 so I can run a higher headspeed. Would the longer boom help or hurt tail performance? What's the max headspeed I can safely run? Can I run the 620s with a short boom and do the 620s limit headspeed like the 690s do? I'm looking for the insane collective pop the logo 600 is known for.

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04-25-2011 08:30 PM  7 years agoPost 2
jphilli

rrKey Veteran

Atlanta, Ga.

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You can run 620's with the stock boom. With 600 edge FBL blades I've run upwards of 2700 rpm but you end up eating main gears, pinions, and one-ways every flight. I usually like to keep the HS between 2500-2600 which will almost eat main gears, pinions, and one-ways, but won't. With 620's, I'm not entirely sure how the heli will perform at certain rpm ranges but if it were mine I would start between 2200-2300 and work my way up to something I like.

Keeping the 600se boom could make the helicopter to tail heavy but since your customer already has said boom and belt and batteries and I assume it balances fine, the blade change will not effect CG so it should be a non-issue.

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