View Full Version : Blade washers - do I need them
Mikej
09-01-2007, 08:54 AM
Sorry me again :o:o
Do I need to use both of the blade washers - I struggle to get both in however with one in it sets up nicely - do I need to force the other one in ???. If I can get away with one only, is it better to use it at the top or bottom ??
Cheers,
Mike.
Backfired
09-01-2007, 09:36 AM
I only installed one on mine and it works great.
joskibob
09-01-2007, 12:26 PM
hhaha you gotta be kidden me... somehow i JUST lost one of my washers and ive been looking around camp for one that is similar in size. How do you lose a freakin washer? I think maybe it got pushed back when i was putting it in and wasnt actually in. Didnt do a good preflight...either that or i just didnt put one in.
Airboss
09-01-2007, 05:52 PM
FYI,,, my best buddy just finished the 550 build and it almost killed him and me! during spoolup on the second flight test his heli main grips exploded and threw the mains at us . this heli is dangerous and should have grips replaced before flying. the stock plastic is crap. be careful please.he was using 550mm blades and around 2200 rpm calculated.
jackyfu
09-01-2007, 05:53 PM
Sorry me again :o:o
Do I need to use both of the blade washers - I struggle to get both in however with one in it sets up nicely - do I need to force the other one in ???. If I can get away with one only, is it better to use it at the top or bottom ??
Cheers,
Mike.
HI !
I used CA to glue both washers on to the blade where the holes are.
Just a very tiny drop of CA -- Do not let CA go into the brass bushing.
I don't know if both washers are needed.
I use both because they came with the kit.
hommer75
09-02-2007, 01:19 AM
FYI,,, my best buddy just finished the 550 build and it almost killed him and me! during spoolup on the second flight test his heli main grips exploded and threw the mains at us . this heli is dangerous and should have grips replaced before flying. the stock plastic is crap. be careful please.he was using 550mm blades and around 2200 rpm calculated.
Well, the plasics were not designed for that kind of headspead as you can figure out for yourself. (850Kv engine, 14t pinion, 6S). It is also documented quite well over here that with 2000+ headspeads you should realy go with the CNC grips.
mbigby2
09-02-2007, 10:48 AM
FYI,,, my best buddy just finished the 550 build and it almost killed him and me! during spoolup on the second flight test his heli main grips exploded and threw the mains at us . this heli is dangerous and should have grips replaced before flying. the stock plastic is crap. be careful please.he was using 550mm blades and around 2200 rpm calculated.
If your buddy is spinning wooden 550 blades to 2200 rpm, it's not clear to me that the blade grips are the problem. I'm surprised the blades didn't fail before the grips...
Airboss
09-02-2007, 09:11 PM
If your buddy is spinning wooden 550 blades to 2200 rpm, it's not clear to me that the blade grips are the problem. I'm surprised the blades didn't fail before the grips...
no he was using carbons and his whole set up was done by a reputable hobby store wich i wont mention.they gave him the motor blades and kit along with recomended gearing, this heli was only at 60% and then he hit idle up and it was set to 70%.. this heli never got off the ground!head spead calculated would have been 2100 at 100%.i would rather hit myself in the head with a hammer than fly that junk!
joskibob
09-03-2007, 02:34 AM
I just flew my hurricane with one washer and it flew like a dream still.... I dont do aerobatics or anything though. dont know how it it would effect flying inverted... but im sure you'll be fine.
tungym
09-05-2007, 09:49 AM
Without the spacer, the gap is almost 2mm and is unsafe to bolt the grip tight.
The plastic grip is safe to hold my 515mm 78g carbon blade at 2200rpm HS.
For my another heavy 550mm (120g) fiber glass blade, I have some worry and keep the HS low at ~1900.
Remember, the centrifugal/pedal force is porpotional to the mass of the blade but square to the HS (angular velocity)
Anyway, why the blade manufacturers do not make lighter blade without the Lead inside? Is that necessary to keep the blade spring open in acceleration? Theoretically, the blade retreats in acceleration, but how is that behave in real life?
joskibob
09-05-2007, 12:30 PM
Without the spacer, the gap is almost 2mm and is unsafe to bolt the grip tight.
The plastic grip is safe to hold my 515mm 78g carbon blade at 2200rpm HS.
For my another heavy 550mm (120g) fiber glass blade, I have some worry and keep the HS low at ~1900.
Remember, the centrifugal/pedal force is porpotional to the mass of the blade but square to the HS (angular velocity)
Anyway, why the blade manufacturers do not make lighter blade without the Lead inside? Is that necessary to keep the blade spring open in acceleration? Theoretically, the blade retreats in acceleration, but how is that behave in real life?
I would listen to him... he sounds pretty smart.