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e-E-Sky Honey Bee- Lama- Belt CP- E-Smart > Flybar on bottom, whats the difference?
 
 
butters149
Senior Heliman
Location: monterey park, ca

So ive seen quite a few belt cp and hbk2 with the flybar on the bottom instead of the top, whats the difference for doing this? and whats involved in the conversion?
01-05-2008 09:18 AM
 
 
tryan02
rrProfessor
Location: Canton, Missouri

butters sorry you were kinda ignored its a duh question but still deserves to be answered. As far as flight characteristics I cant answer that but you learning don't want your main blades closer to your tailboom. Ouch. And to do this it requires a whole new head the (T-you know) helicopter has it this way so you would have to buy its or one of its clones whole head assembly and put it on your mainshaft.

Canton MO backyard flying club
Club President
Team No funds left.
01-05-2008 04:05 PM
HOMEPAGE  
 
 
design engnr
Senior Heliman
Location: Cookeville, TN

The theory is that the overslung flybar has greater leverage when inducing cyclic response, and thus provides for a quicker cyclic reaction. The jury is still out on whether it actually improves the response. I have flown both an can't tell the difference. I say stick with the stock set-up. Being new you have just as much chance of a boom stike with either set-up. Might as well learn with what you have.

Dave

Dave
01-05-2008 04:24 PM
 
 
tryan02
rrProfessor
Location: Canton, Missouri

Of course a design engnr would of brought theory to the table. I haven't flown the overslung so wasn't gonna make a call on that. Being mostly electrical I do understand In theory the geometry of the force being closer to the body should give more response to the body of the heli. But on the same token a bigger lever (rotor to body distance)Can exert more force. Sounds like 6 one way half dozen the other or is your cup half empty or half full sort of thing.

But it wont even start if their aint no gas in it.



Canton MO backyard flying club
Club President
Team No funds left.
01-05-2008 04:36 PM
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DougsRC
Elite Veteran
Location: MA

Karl is my personal hero, NOT Alan Szabo(no offence Alan) There are many more things that will give you quicker cyclic other than overslung or underslung. Take your time Heli-Brother .
01-05-2008 04:43 PM
 
 
shizack
Key Veteran
Location: Augusta, GA USA

Flybar on top (overslung) looks better. So that means it works better.

Also, adding pinstripes makes it faster, and using a TRIX (edited) canopy makes it think it is a TRIX (edited), so it'll never crash.

Your results may vary...

<edited to tame down profanity - sorry Doug>

The more they overthink the plumbing, the easier it is to stop up the drain.
01-05-2008 04:53 PM
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DougsRC
Elite Veteran
Location: MA

TRIX, TRIX TRIX you say TRIX
01-05-2008 04:55 PM
 
 
Gregor99
Elite Veteran
Location: Western Wa

I had heard the underslung, ala T-rex and others, is a slight bit more stable configuration. That seems to be consistant with the additional leverage comment from design engnr.

Interestingly the RC-Tek Diablo has a overslung flybar and upper mounted motor (closer to rotational mass). The combination of those two things should serve to destabilize it compared to the Trex that uses a underslung bar lower mounted motor. However those that have flown both say the RC-Tek is very stable but also flips very fast.
01-05-2008 05:15 PM
 
 
copperclad
Elite Veteran
Location: ..

hi
i have heard that it is getting the flybar paddles up in unspoiled air that is supose to be the advantage , and agree with the six to one , half dozen to the other , i can't remember anyone being able to pass a blind test on flying them if they can really feel the difference at the sticks , i'll bet they peeked
01-05-2008 05:23 PM
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Gregor99
Elite Veteran
Location: Western Wa

The unspoiled air theory makes sense until you go inverted.
01-05-2008 05:52 PM
 
 
copperclad
Elite Veteran
Location: ..

Quote 
The unspoiled air theory makes sense until you go inverted

hi Gregor
absolutely , your inverted point pretty much shoots any argument for one being better that the other right down , so we are back to the , six to one , half dozen to the other

i think , no worries , choosing a heli based on flybar position , they are both pretty much the same
01-05-2008 06:29 PM
HOMEPAGE  
 
 
Gregor99
Elite Veteran
Location: Western Wa

Well not entirely. Regardless of inverted or not, we still have the relationship of the main blades to the rest of the airframe, which really won't change. To far from the airframe, and the heli may flip or roll easily. Too close and you'll get boom strikes, more easily. I think the ideal would be to run the blades as low as possible or move as much weight as possible up to the blades. Of course this assumes you as a pilot can handle the added lack of stability, I'm not there. This is the reason I'm in favor of moving the battery up high like most of the 450 size and up helis. I'm also in favor of moving the motor and servos up high (like the RC TEK) instead of down low like the Trex.

However in then end, I think there is a long list of other factors that influence flight characteristic more than the flybar's location. Things like head dampers, head speed, plastic vs metal head, type and length of blade, servo speed, and most importantly the skill of the pilot.

With the HBK2 the smaller size gives it an inhierent instability so most of these things are really requires to get it to move around a snappy way.

One thing that always baffled me about the eFlight Blade is they have the blades very very low. They could get some stability for free by extending the head half an inch.
01-05-2008 09:51 PM
 
 
DougsRC
Elite Veteran
Location: MA

I hear you loud and clear Gregor, Eflite needs a New R+D team, I have had and still have many issues with Eflite, Revenge is mine, Sayeth the Dougie !
01-05-2008 10:10 PM
 
 
tryan02
rrProfessor
Location: Canton, Missouri

Ill be selling friends BCPpro for him soon complete with airwolf fuse. Maybe you could kamikaze right into the eflite office.

Canton MO backyard flying club
Club President
Team No funds left.
01-05-2008 10:12 PM
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DougsRC
Elite Veteran
Location: MA

That would be FUN for sure, but my plan is long term and legal, revenge is mine sayeth the Dougie!
01-05-2008 10:14 PM
 
 
copperclad
Elite Veteran
Location: ..

Quote 
we still have the relationship of the main blades to the rest of the airframe

hi Gregor
thanks for clearifying this , my old brain is not nimble enough to have caught what you were saying , and i was talking simply about the position of the flybar effecting handling , not on how it effects the machines geometry

i couldn't agree more that it can have a direct effect of the relationship between the rotor disks position to the boom , and the rotor disks relationship to the vertical CG , which of coarse are all considerations that may be important in making a selection of a new machine

you have raised a lot of good issues and some great food for thought , thanks again , dana
01-06-2008 12:09 AM
HOMEPAGE  
 
 
tryan02
rrProfessor
Location: Canton, Missouri

Case in point look how high the head is on a king vs BCPPro. Enough said.

Canton MO backyard flying club
Club President
Team No funds left.
01-06-2008 12:14 AM
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e-E-Sky Honey Bee- Lama- Belt CP- E-Smart > Flybar on bottom, whats the difference?
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