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HomeAircraftHelicopterHIROBOOther › Evo 50 4mm flybar conversion
11-25-2006 09:28 PM  11 years agoPost 1
Eury

rrProfessor

Dover NH

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I was working on an Evo today, and happened to have the head apart, and noticed that it would be pretty easy to convert it to a 4mm flybar. Why would I want to do that? Because I accidentally tweak the 3mm flybar all the time while transporting it, and I have yet to bend a 4mm in anything other than a crash. Here's how I did it.

OK, a trip to the LHS was fruitful. Total cost, $11. To do the conversion without having to modify the seesaw to fit an 8mm bearing, you need to buy Thunder Tiger part #PV0051. That'll get you 4 4x7x2.5mm bearings that drop right in place of the stock bearings, and give you a couple of spares. If you are a T-Rex owner, I managed to track down that they have that size bearing somewhere in the head as well, so you may even already have some. Then pick up a package of Traxxas 4x6x.5mm washers part # 1549 to make up the .5mm difference between the thickness of the stock bearing and the TT part. Drop the bearings into the seesaw, install it onto the head, put the flybar in, and put one of the Traxxas washers on each side.

Then take the center rotor hub and slightly relieve the hole that the flybar passes through. Don't take much off, only widen it by less than a millimeter. You can probably skip that step, the one I worked on had just enough clearance so that it wouldn't touch, but I relieved it just in case.

From there, you need to drill out the flybar cage where the flybar passes through so the 4mm flybar will fit.

That's it, put on a 4mm flybar, and you are there. Now you have a stiffer control system, a much larger selection of flybars and paddles for tuning, and you don't have to worry about accidentally bending the 3mm everytime you put the heli in the car. Total time for the modification was about 10 minutes.

And this is the flybar cage. Pretty simple.

And here's the result.

Pretty damn cool, huh? If you do it, you may want to order a spare flybar cage just in case you screw up.

Nick Crego

Citizen #0168

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11-25-2006 10:50 PM  11 years agoPost 2
Jafa

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Sydney, Australia

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The problem is that you've now slowed the flybar down due to increasing it's mass - you'll be looking for very light paddles to compenstate for that...


Protos | Logo 400 & 500 | Sceadu Evo | Freya Evo | Trex600N | Avant FX

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11-25-2006 10:53 PM  11 years agoPost 3
Eury

rrProfessor

Dover NH

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Do you really believe that you'd notice the difference? Besides, now you have use different paddles and flybar anyways. Throw a longer flybar on there and the response will be faster than you'd get with any lightweight paddle on a 3mm.

Nick Crego

Citizen #0168

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11-25-2006 11:14 PM  11 years agoPost 4
Jafa

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Sydney, Australia

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Augusto and Steve were bending Avant/Aurora 4mm flybars
Augusto refused to use a 5mm flybar for this exact reason,
that's why Carbonxtreme sell a high tensile 4mm flybar


Protos | Logo 400 & 500 | Sceadu Evo | Freya Evo | Trex600N | Avant FX

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11-25-2006 11:27 PM  11 years agoPost 5
Eury

rrProfessor

Dover NH

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OK. I'm saying that in MY experience (which is quite a bit), I've never accidentally bent a 4mm flybar. I've owned a bunch of 60s and 90s, and a Pantera (all with 4mm) and I've never bent one accidentally. Almost every 90 (Synergy is the only exception I know of) uses a 4mm, and they all work fine, without people having bending problems.

Jesus, why do people feel the need to s#!t on someone's project? If you don't want to do it, then don't, but don't come in here and try to make me feel stupid for doing it. I like it, it works well, and addresses a problem I have with most 30 and 50 sized helis.

Nick Crego

Citizen #0168

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11-26-2006 11:31 AM  11 years agoPost 6
Andi G

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Switzerland

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I like the idea, but do you think there is enough flesh left on the seesaw? There won't be much plastic left to hold the bearing in place..

Andi

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11-26-2006 12:36 PM  11 years agoPost 7
Jafa

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Sydney, Australia

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There's a bunch of newbie's out there
that deserve to know both the pro's and cons

Don't take it personally


Protos | Logo 400 & 500 | Sceadu Evo | Freya Evo | Trex600N | Avant FX

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11-26-2006 01:32 PM  11 years agoPost 8
Eury

rrProfessor

Dover NH

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What got me thinking about this is my Pantera has a 4mm flybar, and I really like it. So while building the Evo, I pulled apart the assembly on the Pantera (which was crashed, so it was in pieces anyway), and started to compare. The resulting plastic left around the bearing in the Evo seesaw is about twice as much as is in the Pantera stock, so I'm thinking it's fine. Beyond that, we're not talking about the removal of much material, it amounts to half a mm less wall thickness around the bearing. I'll fly it and see what comes, I can tell you that I'm very careful and protective of my helis, and I checked out every aspect of the modified assembly, and it's still as solid as stock, possibly more so from the extra stiffness of the flybar.

Nick Crego

Citizen #0168

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11-26-2006 01:59 PM  11 years agoPost 9
Sky 5

rrNovice

Spring Hill, Tn

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I like it. The 3mm flybars do get bent easily. I was thinking about trying my hand at tempering the metal with a torch. Just wondering, couldn't you lengthen or shorten the flybar to increase/decrease response without changing the paddles?

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11-26-2006 02:10 PM  11 years agoPost 10
Eury

rrProfessor

Dover NH

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Yup, that's what I did to get the response I wanted out of my Pantera. The longer the flybar, the faster the response. The one I have in the Evo now is about the same length as the stock Evo flybar, after trying it out, I'll probably put in the 520mm I've got spare from the pair I bought for the Pantera. That really made the Pantera come alive, it should do the same for the Evo.

Nick Crego

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11-26-2006 02:10 PM  11 years agoPost 11
hootowl

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Garnet Valley, Pa.

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Nice mod Nick.

My peeve with the stock EVO50 flybar, not only does it bend easy, if you don't dremel flats in it where the set screws dig in, you can't get the buggers out.

I don't see any obvious problem with the drilled out seesaw except it's not the most accurate way of installing a bearing. The good thing is out there on the ends of the seesaw it's really not that important. Might be a good idea to CA the bearing in just to take up space around it if it wasn't a perfect fit.

Let us know if you see any real performance advantage/disadvantage. The 3mm bar seems aweful flimsy which makes me wonder how that effects it's ability to control the head. Flimsy could be a good thing. Stiffening it up might really cool down the EVO too much.

Thanks for showing how you did it. It may be one of my future mods.

Mike

Wolves don't lose sleep over the opinions of sheep

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11-26-2006 02:21 PM  11 years agoPost 12
Eury

rrProfessor

Dover NH

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Thanks Mike. You're right, it definitely isn't the most accurate way to locate a bearing, that's why I had NIP spares sitting right next to me. I did CA the bearing, just for peace of mind, I don't know that it actually needed it, but hey. The way I did it was to sand out the hole slowly and trial fit the bearing until it was snug, but not so snug as to bind.

I'm thinking I may buy a metal flybar seesaw and cage and give it to a buddy who's a machinist to modify for me. I REALLY like the 4mm flybar on the Pantera, and it's about the only complaint I've ever had on the Evo.

Nick Crego

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11-26-2006 03:17 PM  11 years agoPost 13
Gary Jenkins

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Nowhere, US

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Boca Bearings has a 4 x 7 x 2.5 mm bearing so you wouldn't have to ream out the seesaw.

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11-26-2006 03:24 PM  11 years agoPost 14
hootowl

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Garnet Valley, Pa.

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There ya go.

Gary... going flying today?

Wolves don't lose sleep over the opinions of sheep

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11-26-2006 03:52 PM  11 years agoPost 15
Andi G

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Switzerland

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Sounds good Nick, might try that next time I bend the flybar

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11-26-2006 03:54 PM  11 years agoPost 16
Eury

rrProfessor

Dover NH

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Ahh, that's cool. I looked on Boca's site before, and didn't see those, I was looking for 3mm wide ones. I'll have to order up a pair of them. WIth those, the only thing you'd have to modify is the flybar cage, which was dead simple.

Nick Crego

Citizen #0168

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11-26-2006 06:58 PM  11 years agoPost 17
LDR

rrApprentice

Sarcoxie, MO

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What lenght of flybar are you going to try?

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11-26-2006 07:43 PM  11 years agoPost 18
Eury

rrProfessor

Dover NH

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OK, a trip to the LHS was fruitful. Total cost, $11. To do the conversion without having to modify the seesaw to fit an 8mm bearing, you need to buy Thunder Tiger part #PV0051. That'll get you 4 4x7x2.5mm bearings that drop right in place of the stock bearings, and give you a couple of spares. If you are a T-Rex owner, I managed to track down that they have that size bearing somewhere in the head as well, so you may even already have some. Then pick up a package of Traxxas 4x6x.5mm washers part # 1549 to make up the .5mm difference between the thickness of the stock bearing and the TT part. Drop the bearings into the seesaw, install it onto the head, put the flybar in, and put one of the Traxxas washers on each side.

From there, you'll need to modify the flybar cage like I detailed above, but that mod is much less critical in dimensions and accuracy than the original seesaw mod. And voila, 4mm flybar on an Evo. It looks, fits, and feels like it came from Hirobo like that.

For the flybar, I've got 2 that I'm going to try. Initially, I'm going to use a 520mm from a Predator, the same as I'm using on my Pantera, along with a set of TT Red paddles. That combination on the Pantera gave excellent stability, and extremely responsive cyclics when pushed. I also have a 4mm that is about 5mm longer than the stock flybar, I'm not sure of the length, but looking at it, I'd say it's around 430mm or so.

I've modified the top post to reflect the better way of doing this.

If anyone wants to do this mod to their own heli, Shoot me a paypal for $6, and I'll put the 2 extra bearings and spacers that I got in a first class envelope and send them to you, they're just going to get lost sitting around my shop. If you want me to send it priority, cover the costs for the priority envelope.

Nick Crego

Citizen #0168

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11-26-2006 09:43 PM  11 years agoPost 19
Learn to Fly

rrKey Veteran

Yalesville Connecticut

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Great!! Im sick of bending mine during transports, plus my house is small and I have whacked it coming in and out a few times now.

I dont see it being a problem at all. A few more grams wont even be noticed.

Jeff


Jeff
Believe nothing you hear, and half of what you see...

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11-26-2006 11:16 PM  11 years agoPost 20
marc8090

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Long Island, N.Y.

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Nice mod. I've thought of doing this because I've bent two stock flybars in flight, one caused a crash, and broken a third which also caused a crash. What 4mm flybar did you find that was close in length to the stock one?

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HomeAircraftHelicopterHIROBOOther › Evo 50 4mm flybar conversion
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