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01-12-2013 04:43 AM  7 years ago
rapidity

rrVeteran

ohio

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What about your tail rotor? Aren't u gonna have to regear or add a blade, your rpm to the tail is gonna be going way down.

How did it affect your amp draw?
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01-12-2013 04:53 AM  7 years ago
richardf

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San Diego, CA USA

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I have the gear with more teeth to speed up the tail when I get a chance. Not sure about amps yet, need time at the field to know if the draw is higher with 3 blades vs 2 and flybar drag. Not sure if I can even make a determination.

-Richard.
AMA 4628
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01-13-2013 01:29 PM  7 years ago
rapidity

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ohio

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"I ordered just a hub and spindles for 80 USD to convert a plastic Freya with no other changes as a test for comparison."

So how are these heads constructed. Spindle goes through grip bearings to hub, bolt runs through spindle and into hub?

Does the spindle length match the freya grip or use spacers? What about the arm length and ball location?

This would be an economical way to do it if it doesn't require a machinist to get it right. Could get the right swash to match your control system without the added cost of buying their whole assembly.
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01-13-2013 03:24 PM  7 years ago
richardf

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Rapidity

I was speaking from an economical point of view since I have a variety of grips available in my spares from other projects. There is still a bunch of labor and machining to take place potentially. In the end, it will allow me to compare how a standard Freya responds by adding a blade and not a bunch of cash. I want to know if this is more complexity for marginal gain, Cool factor aside, there has to be more reasons to do this.

The JR hub system has the spindle going through the hub with a larger opening as a pass through for the spindle with a shank. The known labor is changing the ball layout on the center of the swash to 120 degrees.

-Richard
AMA 4628
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01-21-2013 04:32 PM  7 years ago
richardf

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Sorry for double posting
I am in the process of converting a sows ear into a silk purse by converting an old Vibe 90 to electric with a 3 blade head at almost zero cost.

-Richard

AMA 4628
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01-21-2013 10:01 PM  7 years ago
mpafonseca

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Savannah, GA - USA

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Hey Richard,

Are the spindles free to float over a damper on the hub or are they rigidly fixed there?

Thank you,

Marco
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01-21-2013 11:38 PM  7 years ago
richardf

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San Diego, CA USA

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Both versions that JR makes are solid, the neoprene sleeve is very thin and rock hard, no damping there. The individual spindles are pinned in place with a set screw as well.

-Richard.
AMA 4628
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01-25-2013 02:29 AM  7 years ago
rapidity

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ohio

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Is the blade bolt 4 or 5mm on the 351?
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01-25-2013 05:25 AM  7 years ago
richardf

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San Diego, CA USA

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The 351 is 4mm drag bolt.

-Richard
AMA 4628
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01-29-2013 08:05 AM  7 years ago
RLHeli

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Auckland - New Zealand

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Here is the 3 blades tail rotor head from K&S. Review by the runner-up of '12 Japan National. He commented that increased tail power for improved hovering heading lock and snappier aerobatic yaws specially with fuse. He is considering equip his FB WC machine with this upgrade.

Back to the main rotor head... Isn't a 4 bladed head easier to balance?
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01-29-2013 08:54 AM  7 years ago
F3CWNB

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Napier, New Zealand

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Maybe we will end up with 4 bladed tails as well... enter the 5 blade set up 6... 7...'Life' is Looking Up!!!
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01-29-2013 11:33 AM  7 years ago
rapidity

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ohio

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I ordered a 4 blade century head to give a try with. I've been watching videos of these multi heads and they look pretty stable. A lot of the guys seem to be flying them without flybars or gyros and they actually look pretty good, though they don't do much with them, and they're hauling a lot of weight.
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01-29-2013 09:35 PM  7 years ago
richardf

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Looking forward to your four blade video footageAMA 4628
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02-07-2013 01:44 AM  7 years ago
rapidity

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ohio

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How much lower did your 3 blade set compared to your 2 blade head?

Got my century today. Had to cut 5mm off the top which was no biggie, but the head sits a lot lower compared to my V hirobo head. Thinking of raising the main shaft to the 199mm holes but not to thrilled with that idea and will still be a lot lower.

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02-07-2013 02:17 AM  7 years ago
richardf

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Mine did end up a little lower overall after I pushed the mast up to the other one way hole in the main shaft. Honestly, I didn't measure the distance from the blades to the skids? My head is rigid and the blades would be hard pressed to boom strike as far as I could tell.

-Richard.
AMA 4628
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02-09-2013 08:50 AM  7 years ago
rapidity

rrVeteran

ohio

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Had a hell of a time getting this head together as the bearings didn't seat into these composite grips worth a crap. After hours of work, I got them all smooth. Plan is if I like the head after flying I'll switch them out to metal.

Gotta say, these heads look super cool. Switched out tail gearing 5.06. Gonna start out with 9.5:1 with 450KV, but am thinking I'll have to go down to a 400KV motor. Will have to see.

Have to go in on servo arms, have way to much pitch and cyclic right now. Am running 120 swm setup. Scott Grey 700's on it now to start with. Really need to get some numbers, just guessing at everything right now.

Thinking of trying the 3 blade KS tail. Think I can make it work.

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02-10-2013 04:58 AM  7 years ago
HobbyZone

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Burnsville, Mn

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I like the titanium linkages!
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02-11-2013 09:05 PM  7 years ago
Santiago P

rrProfessor

Dayton

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Scott Grey 700's on it now to start with.
That is an awful amount of inertia for the FBL system to handle in aerobatics, I would guess three 190gr blades or four 175gr would be more on par, but then, I am just guessing.

The drag of four 700mm ores will suck that battery , unless you are down in the 1200-1600rpm range.

Santiago
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02-11-2013 10:07 PM  7 years ago
rapidity

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ohio

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But I already have 4 of these. Funtech on rcjapan is showing some mighty big blades for the multi headed rotor blade packages. Will have to see what the numbers show and what kind of rpm will actually be needed. Have a head grip problem that I need to get worked out right now.

If this doesn't work out will make it into a semi scale bird or can always reduce the hub to 3.
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02-12-2013 11:32 AM  7 years ago
rapidity

rrVeteran

ohio

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I was thinking, what does the fbl unit care what the blades weight as long as they do what the unit is expecting?

Maybe some heavy duty servos would help in this matter? Like 3 bls157hv? That would be a lot of torque to help them behave.
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