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HelicopterCentury Radikal G20-30 N640 Hawk Predator › Safe head speeds for Hawk
04-28-2004 02:26 PM  13 years agoPost 1
Ninjak2k

rrApprentice

Centreville, VA

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A quick search didn't reveal the answer to this question. What the highest head speed that is safe for a Hawk Sport? I'm thinking of getting an MP2 for my TT39 and have read that that pipe likes really high head speeds, in the 1900-2000 range. Since the stock head doesn't have thrust bearings, I'm concerned that's too much. While I been thinking of getting the 6mm spindle with thrust bearings upgrade, is it necessary?

Thanks,
Dan

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04-28-2004 03:22 PM  13 years agoPost 2
SteveH

rrProfessor

Texas

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Dan,

You'll probably be ok at those heads speeds with relatively light blades, but the thrust bearing upgrade is really a nice upgrade. You get the thrust bearings, all new radial bearings, and the new bigger 6mm feathering shaft. Additionally, because the shaft is larger, 6 vers 5 mm, the damping is tightened up also improving cyclic response. Many fliers opt first for the ball bearing upgrade, and it is good, but in my opinion, the thrust bearing upgrade does more for you, followed by the tripple ball bearing tail rotor option.

The government cannot give you anything without first taking it from someone else.

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04-28-2004 04:17 PM  13 years agoPost 3
Ninjak2k

rrApprentice

Centreville, VA

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Steve, thanks for the advice. I am fortunate in that the Hawk I bought came with the triple bearing upgrade and bearing upgrade already, so all I'm missing is the thrust bearing upgrade. Guess that settles it then.

Thanks,
Dan

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04-28-2004 10:36 PM  13 years agoPost 4
dnts

rrVeteran

Israel

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Your question is just what I had in mind when I switched from the Hawk to the Raven 30. The Irvine 39 with MP2 is toooooo much for the Hawk (Irvines are notoriously strong). I run carbon blades and even without the MP2, I felt the Hawk grips lock in FFF when the head speed went up. The cyclic is also nicer with the 6mm spindle and the direct servo to swashplate coupling plus full ball bearing (not stock in Raven 30) eliminate all the play in the head I was used to with the Hawk. Get the Raven for $247 at Rick's. Kick A$$ deal.
While at it, you might want to try longer tail blades. I know I need a pair for the power climbouts I am about to make...
Nir

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HelicopterCentury Radikal G20-30 N640 Hawk Predator › Safe head speeds for Hawk
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