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HomeAircraftHelicopterSpeed - Performance - Drag Race › What is legal in 50 class?
10-15-2005 11:34 PM  12 years agoPost 1
Santiago P

rrProfessor

South West, Ohio

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The stock Dia on my beater 50 heli is about 53" with 600mm blades. I have a head from an old Xcell 60 I will like to use on the 50 becase it is much stronger. It increases the main Dia about an inch. Is this legal in the 50 class as long as the blades are kept to 600mm? If not, then what is the max main rotor dia?

General questions:
On the start, is it required that the entire skids are kept on the ground, or is it normal to lean the heli fwd as long as it does not leave the ground?

Is there a sound/noise limitation on while the helis stage?

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10-16-2005 06:09 AM  12 years agoPost 2
Santiago P

rrProfessor

South West, Ohio

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uncunsiuos bump

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10-18-2005 04:25 AM  12 years agoPost 3
Santiago P

rrProfessor

South West, Ohio

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concious one...

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10-18-2005 12:13 PM  12 years agoPost 4
KenJ

rrVeteran

Ohio, USA

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50 class
Typically (at least at IRCHA), the classes are set up to regulate engine displacement.

Most of the pilots flying 50's are running either 570mm or 600mm blades as there are lots of blade choices out there.

Putting larger blades on a drag race heli is not really a good idea unless you have an abundence of power and need the additional surface area to "put it to the air".

I have run an Xcell head on my drag race machine in both the 30 and the 50 class with anywhere from 550mm to 600mm blades.

So, in answer to your questions,

1) Can you run the Xcell head - Yes

2) As long as some part of the heli is on the ground, you are good to go. - Also leaning forward is OK.

3) There have been no sound DB numbers enforced at most races, but with the modern technology, most pilots are running some type of muffled pipe.

That is at IRCHA, typically all fields including the AMA sites have some type of noise restrictions.

Just FYI, the old Muscle Pipe 1 for a 60 works pretty well on most 50's

Hope this helps,

Ken

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