4MM Bolt for 550 Blades for Swift 16 question

[Ollie West]

My mate has a problem, with the high powerd motor he is using the stock 3mm blade bolts are starting to bend with the high head speed and wants to upgrade to some 550 blades. But the hole is only 3mm in diameter. So have some of your drilled bigger holes in the blade grips or done something else? Also he is using narow spacers which doesn't help the bending problem, does anyone else suffer from this?

Ollie ;)

[RAV50]

Man that must be one from the very first production runs a few years ago. All the ones I have seen over the past two years or more have had blade grips that where beefier and used 4mm blade bolts. These can take 560mm blades at 2200 and keep coming back for more.

The original ones worked fine when using the stock 520mm blades and normal rotor speeds (I even used them with RotorTech 515's and 6cell packs at a 2150 head speed - rigged like this it was a real performer).

[Ollie West]

Many thanks, yes he bought the kit when they were brand new so that expalins why they were 3MM not 4MM.

Ollie ;)

[Coolice]

Hey,

I agree with whats already been said, while you could drill out the existing grips I'd just go for the newer more beefier ones.

Also, as your adding 550 mains may I also suggest fitting the metal head block if you haven't already got it.
As your friend sounds like he is now winding up the model for more serious flying, adding strength in a major area will not go amiss.

The upgraded head block is not a lot of money but assures reliability as you push the model more.
.