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HomeAircraftHelicopterMiniature Aircraft Whiplash & Fury 55 › Old Pro2k head as FBL ?
08-31-2013 09:59 AM  5 years agoPost 1
marked23

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Lynnwood, WA

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I've got one of these:

As you can see, I took the flybar off and added long balls to the grip. I used the double ball because it has more threads and I could back it with a nut.

The grip have bolt shoulders that are drilled and countersunk for 4mm bolts. I want to use 5mm bolts. The bolt shoulder OD is about 7mm.

Two questions:
1) Is this double ball likely to break with FBL forces?

2) What can I do to replace the bolt shoulders?

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08-31-2013 05:23 PM  5 years agoPost 2
KevinB

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Earth

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I have seen people use that double ball method off the grip arm, but personally, it kind of scares me.

My Fury Extreme head I converted to FBL just by removing the flybar assembly and taking the rod that used to go to the flybar, and using a longer rod to take it down to a double ball fitting replacing the yoke clamping bolts. This way you can adjust the ratio to the blades (by substituting longer or shorter balls on the mixer), and the double ball only takes 1/2 as much feedback load from the blades because the load is shared with the ball on the swash ring.

KevinB

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08-31-2013 05:43 PM  5 years agoPost 3
marked23

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Lynnwood, WA

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I saw that, Kevin. I thought that was a clever idea. I'm trying to keep the parts count low, so I'm hoping to try this first.

I've had this head in my junk box for a few years, and I'm excited that I might have a reason to use it.

I guess I could put a mixer arm on these grips, same as I would have done with plastic grips like you did.

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08-31-2013 11:54 PM  5 years agoPost 4
Eury

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Dover NH

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I flew my Spectra like that for a year or so. Worked great.

Nick Crego

Citizen #0168

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09-01-2013 04:38 AM  5 years agoPost 5
marked23

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Lynnwood, WA

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Any advice about how to drill this out for 5mm?

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09-01-2013 04:46 AM  5 years agoPost 6
Flys4Fun

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new mexico

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a pro head in a 'junk box' lol its as good a machined and built head by todays standards imo.

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09-01-2013 04:55 AM  5 years agoPost 7
marked23

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Lynnwood, WA

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>junk box

Yeah, well I bought the complete head for $25. It sat in my junk box because my other head was working fine.

Now that I've been to IRCHA, I have FBL fever! This is going to be my first flybarless heli.

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09-01-2013 12:20 PM  5 years agoPost 8
Peterr

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Queensland Australia

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Are the grips the same as the Tempest head grips ? if so , the tempest FAI pitch arms should make an easy FBL conversion...

E ,N ,G Whiplash's;Spectra G's;Stratus;E&N Razor,Fury 55;Furion6;TSA 600N, 700N, 700G;; Be

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09-01-2013 02:46 PM  5 years agoPost 9
KevinB

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Earth

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Good call Peterr. If those arms fit your grips marked23, that would be your best solution for a clean head with no chance of breaking a ball or popping a link off.

KevinB

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09-01-2013 09:35 PM  5 years agoPost 10
marked23

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Lynnwood, WA

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I have a new-in-the-package set of the bell mixers. Is that what you're talking about?

Unfortunately, I've already re-tapped the blade grips for a different thread pitch.

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09-01-2013 10:22 PM  5 years agoPost 11
marked23

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Lynnwood, WA

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Oh you mean the 122-16. Yeah that looks like the ticket. It is the same bolt spacing. I'll buy a couple and try it.

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09-02-2013 02:28 AM  5 years agoPost 12
KevinB

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Earth

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Yes . The arms.

KevinB

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09-06-2013 05:30 AM  5 years agoPost 13
marked23

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Lynnwood, WA

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Correct bolt spacing & fits the grip perfectly, but the Tempest FAI arm is just a bit too long.

What would happen if I used the too-long arms anyway? I'd get neg. delta? What's the effect of that?

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09-06-2013 10:01 AM  5 years agoPost 14
Peterr

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Queensland Australia

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You'll get all sorts of phasing funnies , won't be nice to fly at all..

Just noticed in the piccy in your first post , that you have the PRO (std) head with Tempest grips , the tempest head block is wider with a longer blade axle; that's why those pitch arms don't work ,, Sorry , shoulda picked that earlier .....

What I've done with a couple of mine is to leave the bell mixer setup installed to the std pitch arm ; fit a ball to the head compression bolt at the base of the head block , and make up a link to go from that ball to the "trailing" bell mixer ball , then a rod from the "leading" bell mixer ball to the swash ... sounds complex , it's not!! works great too ....

different head , same principal .... http://www.rcrotorz.com.au/album.ph...tachmentid=2072

E ,N ,G Whiplash's;Spectra G's;Stratus;E&N Razor,Fury 55;Furion6;TSA 600N, 700N, 700G;; Be

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09-06-2013 08:43 PM  5 years agoPost 15
marked23

rrKey Veteran

Lynnwood, WA

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Peterr
Is that the same kind of setup as in KevinB's picture?

I'm at the point where I should do that, but the problem is I already ruined my pro2k-arms by re-tapping them for the double ball.

thank you

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09-06-2013 11:18 PM  5 years agoPost 16
Peterr

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Queensland Australia

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Yep , looks the same.....

The bell mixer attach bolt and the balls are all M3 thread , why did you have to retap it ????

E ,N ,G Whiplash's;Spectra G's;Stratus;E&N Razor,Fury 55;Furion6;TSA 600N, 700N, 700G;; Be

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09-07-2013 01:05 AM  5 years agoPost 17
marked23

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Lynnwood, WA

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Different thread pitch. The mixer screw, at least the ones I have (remember this is a 10.. maybe 15 year old head) is a coarse pitch thread.

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09-07-2013 01:39 AM  5 years agoPost 18
Peterr

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Queensland Australia

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the things ya learn !!!!

I've not had that particular head assy, just had plastic heads on my really old XCells , 60's and Fury's;(now metal), then both versions of the Tempest head on Stratus' and Spectra G's, now Whiplash's as well !!

E ,N ,G Whiplash's;Spectra G's;Stratus;E&N Razor,Fury 55;Furion6;TSA 600N, 700N, 700G;; Be

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09-07-2013 08:40 AM  5 years agoPost 19
TomC

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Gold Coast, Queensland, Australia

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Just my opinion but after playing around with my MA Ion-x over the last +8 years, on everything from 10s-15s and Fb'd and FBL, I think that the best option is to just fly them stock and enjoy the ride.

Converting the heads is always possible and many, including myself. have done so reasonably succefully. The next problem becomes the fbl servo resolution. The best solution to this is to bring the servo arms in quite a bit but this then has a negative effect on the bellcrank geometry.

The net result is that you never actually get as good a result conveting a fb'd heli as you would by just going to a more modern fbl designed heli imho.

Cheers,
TomC

Nqx,Mcpx-BL,300x,450x,500x,550x
Ion-x, 10s ,SS
TT X50E 10s, HC3-Sx

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09-07-2013 02:50 PM  5 years agoPost 20
KevinB

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Earth

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Just fyi Tom,

on my Fury Extreme (2nd post in this thread), the ONLY thing I changed was what I mentioned on the head. Servo arms and resolution stayed the same. I use VBar and ended up with a collective travel setting of 95, and a cyclic setting of 103 to get the 8 degree check. No problem with diminished resolution there.

I won't disagree that the difference in flight quality between it's FB and FBL state probably wasn't as wide as in converting other helis. Those Furys/Ions/Tempests fly pretty darn well stock. It was more a case of FBL giving me the ability to get the feel and reaction of the heli more easily set to where I wanted it through the Vbar settings vs changing parts (ie: flybar paddles).

KevinB

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