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HelicopterBeginners Corner › Blade fixing holes 1 bolt or 2 bolt ?
01-26-2013 12:01 PM  4 years agoPost 1
darren heaver

rrApprentice

rochester, kent, england.

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Hi all just after some opinions and views on the different methods for fixing blades. I know 90% of the market are 1 bolt but is this better than 2 bolts on Vario blades for scale machines ? I have read that blades should be left so that they can move with heli held side on blah blah then other saying real heli blades don't pivot on the fixing so why should ours ? So tighten them tight once they have spun up for the first time and found their correct position so they can't move

What is the correct way and "WHY" ?

" one day I will learn to fly till then I will just hover"

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01-26-2013 09:02 PM  4 years agoPost 2
darren heaver

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rochester, kent, england.

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Come on G-Limo what are you views on this ?
Some one must have some views ?

" one day I will learn to fly till then I will just hover"

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01-26-2013 09:45 PM  4 years agoPost 3
fenderstrat

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Aston,Pa

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then other saying real heli blades don't pivot on the fixing so why should ours ?
because of the headspeeds we run which are way way higher per size than anything full size ,our abilty to use large ammounts of negative pitch and the forces that sport and 3D flying put on an RC Heli.

I dont know the actual physics behind it but our blades(non scale flying) need to lead and lag from what I understand.

I know first hand(and there are threads by many others) that if the blade grip bolts on my Mini titan SE are too tight all kinds of issues arise like shakes on spool up/down and vibs

Compass helis Support Team
PerformancePlusRC field rep
Mini Titan/SE
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01-26-2013 10:06 PM  4 years agoPost 4
darren heaver

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rochester, kent, england.

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Ok cheers for the info I know all heli's vary but just trying to get my head around why Vario make 2 bolt heads and blades if they are no advantage

Cheers Darren

" one day I will learn to fly till then I will just hover"

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01-26-2013 11:01 PM  4 years agoPost 5
RICHW

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Cupertino, CA

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wouldn't the lead/lag apply only to flapping blades?

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01-26-2013 11:18 PM  4 years agoPost 6
darren heaver

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rochester, kent, england.

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That's what in trying to find out

" one day I will learn to fly till then I will just hover"

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01-27-2013 08:16 PM  4 years agoPost 7
darren heaver

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rochester, kent, england.

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Anymore input anyone ?

" one day I will learn to fly till then I will just hover"

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01-27-2013 09:52 PM  4 years agoPost 8
fenderstrat

rrProfessor

Aston,Pa

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wouldn't the lead/lag apply only to flapping blades?
can you elaborate more.

when I said lead/lag I was refering to the blades moving slightly forward or back in the grips(horizontally)during flight.

By flapping blades do you mean a set up where each blade can move up and down independantly? As opposed to most rc helis where the blades have to move up and down opposed to each other?
Ok cheers for the info I know all heli's vary but just trying to get my head around why Vario make 2 bolt heads and blades if they are no advantage
Could it be that they are running HUGE/HEAVY blades at very slow(in comparison to a 3D guy)head speeds??

Compass helis Support Team
PerformancePlusRC field rep
Mini Titan/SE
TEAM KBDD

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01-27-2013 10:21 PM  4 years agoPost 9
MattJen

rrElite Veteran

UK

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i found with the 2 bolt system it made the head very rigid, and very bouncy in the wind.
Which is why some swapped out the Vario head and went with the OF head which had heavier blades and a single bolt system.

Darren you may want to PM peter wales in the scale section he has a tonne of experience using both systems.

EDIT
I also found on the vario system i had to elongate the bolt holes as some of the blades would not sit straight in the grip cos the holes were off centre one blade tip forward when i removed the link and another would tip backwards.

Matt

All The Best

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01-27-2013 10:53 PM  4 years agoPost 10
G-Limo

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Europe

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Hi Darren,

We should discuss this over a burger or a pint or both sometime!!

I can relate what I have read and figured out for myself, but ALL rotor blades will lead/lag to some degree. It's a product of an advancing blade producing more lift and hence more drag than a retreating blade on the same rotor hub. The increasing drag on the advancing blade will cause it to lag compared to it's opposite aerofoil. All this of course is dependent on the head speed and forward flight speeds you are considering..

So with a slow head speed (say 400rpm on full size) and fast flight, there will be quite a difference in blade airspeed between either side of the rotor shaft. Full size heads will have movement and dampers built into the blade holder to control this forward/back blade motion.

On models - is lead/lag an issue?? I think that due to the high head speeds and relative slow forward flight in 3D, Lead/Lag is not perceived as a problem, but I believe it will still be there and if the Blade Bolts are done up tight to stop them folding back on Autos, then possibly its dissipated in the bearing movement in a blade holder rather than motion between the holder and blade itself.

If you run a slower head speed, with no lead/lag instability/oscillations/nodding could show itself as a problem.

Lead/Lag BTW has nothing to do with Flapping Heads/blades.. This is a completely different function built in some heads..

Elongating the holes in a 2 Bolt Hole system on a model will automatically introduce a Lead/Lag hinge in that type of Blade holder!!

/Limo.

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01-28-2013 12:48 AM  4 years agoPost 11
darren heaver

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rochester, kent, england.

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Cheers Matt and Dave good input yes we will have to catch up some time for that chat thanks for the advice. Hopefully might have some time soon to try and get things sorted just don't seem to get time at moment for myself between doing house and work
chat soon.

How's the van going Dave ? I loved my van

Cheers Darren

" one day I will learn to fly till then I will just hover"

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HelicopterBeginners Corner › Blade fixing holes 1 bolt or 2 bolt ?
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