Why a plastic grip on the raptor 90 3D?

[Hummingbird3D]

Usually the trend with the rc helis is to upgrade the head with cnc parts including the grips. What was the big reason for the 90 3D to go with the plastic grips this seems like a downgrade to me.

[Kinger]

So would you consider the MA machines to be downgrades from other heli's because they also have plastic grips? What about the JR Vibe or the Synergy? All 3 of these "high performance" machines use plastic grips without issue. Easier on the bearings, less costly to replace in a crash and in the Raptors case the plastic grips offer more collective range than the metal grips.

[blakka_1]

Plastic grips are also lighter, the aim of the Raptor 3D was to make it as light as possible.

[Hummingbird3D]

"So would you consider the MA machines to be downgrades from other heli's because they also have plastic grips? What about the JR Vibe or the Synergy? All 3 of these "high performance" machines use plastic grips without issue. Easier on the bearings, less costly to replace in a crash and in the Raptors case the plastic grips offer more collective range than the metal grips."


No not at all, you are misunderstanding my question. During the short time I have been into helis I read that one should get a metal this and that. On the Raptors it has been the headblock and grips if you are going to spin up more than 1800 or so rpm. With the recent intro of the 90 3D it is going against the logic that many manufactures and fliers have us believe about wanting to have metal grips on our helis, whatever other brands are doing with their blade grips I have no idea, just the r90 is my concern.

[Kinger]

Trust me, the plastic grip R90 will fly at 1950 on the head all day long. Sometimes people want you to believe that metal this and metal that are requirements in order for a heli to fly better, but a lot of times that's just not true.

[Jafa]

The plastic grips on the Freya Evo 90 are being used at over 2000 rpm

You don't need metal grips but they do provide crisper blade tracking during hard moves
And they do make good bling items

Hard dampers and metal grips can make the hover less stable,
need a higher normal mode headspeed to avoid wobbles
result in wobbles at the bottom of the auto

[vandelescrow]

I've been following this thread because I am planning to build a 90 3D (just getting a few things each pay check). The Thunder Tiger metal blade grips only except one size blade root (sorry can't remember size). the plastic ones come with a rubber insert so if you use blades with larger root you just remove it. Now the Quick UK metal grips are the same as the plastic ones as far as root size so if/when I upgrade to metal grips it will be the Quick UK.

In light of what has been said here, Raptors have a tendancy to (forget the correct terminology) woof (?) boom strike. Wouldn't metal grips eliminate this problem?

Also, with the new dampening the 3D has, can you switch the grips no problem?

[daveisdiving]

quick uk rocks i have all the upgrades they make the best qulity iv seen

[Ronbo]

Any heli can woof, there are several reasons why. dampners, loose blades, tracking, etc. Any heli that has a single bolt to hold the blade on will boom strike, it isnt a raptor only design flaw/characteristic.

[vandelescrow]

Any heli can woof, there are several reasons why. dampners, loose blades, tracking, etc. Any heli that has a single bolt to hold the blade on will boom strike, it isnt a raptor only design flaw/characteristic.

Hm, I thought it was because the Raptor has the blades below the flybar = closer to the tail boom, not because the blades can rotate in the grip.

Thanks Ronbo, That was one of the things I was considering before desiding to get a Raptor 90. I desided to go ahead with it because I already have Raptor 50's and they are basicly the same for setting them up so I figured it would be no sweat.

About the coment about the single bolt holding the blade: I thought the blades have to be able to float some, that was the problem with development with the full size helicopters till they figured that out.

[iher]

Hm, I thought it was because the Raptor has the blades below the flybar = closer to the tail boom, not because the blades can rotate in the grip.


Indeed lower blades exaggerate the problem.
When your blades are loose, and you have a increment in torque that can be caused when in the end of auto the head speed is reduced and you add pitch= more drag on the blade. This pushes the blade back( the other way from its rotating direction)
Try with the heli off. Turn the blade to a +pitch and push it back . You will see that the tip drops down a lot.......=boom strike

as said before, mid air boom strikes can be caused by :
-sudden neg pitch + back elev
-soft dampers
-play in bearings
-loose grips + torque surge

all of these will let the blade "fall" more to some degree when neg pitch is applied, and if it drops enough it will hit the boom

Hope this helps