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14 pages [ <<    <     1      2     ( 3 )     4      5     NEXT    >> ]8240 viewsTOPIC CLOSED
Thunder Power RC . Mikado Modellhubschrauber . GrandRC

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Flybarless Rotor Head Systems > Come help us design Flybarless CNC Heads!!!
 
 
3Dx
Key Veteran
Location: Monterrey NL Mexico!

I am a little confused on which one is the one you Guys liked??

Can you please post the pic???
08-22-2008 11:27 PM
 
 
inkspot1967
rrProfessor
Location: cranston ri.

yeah baby.......

nicely done

Trex700e Ray N e- kit & "Fueled By Hate" Head
Next-D Rave Flybarless
Outrage Battery
08-23-2008 03:13 AM
 
 
3DxKey Veteran - Location: Monterrey NL Mexico! -
Thanks Bud!!!!

Inky I have a question for U:

Is it important to maintain this distance from ball links????

What’s the minimum distance allowed???


08-23-2008 03:19 AM
 
 
inkspot1967
rrProfessor
Location: cranston ri.

yes it must be 30 to 32mm

31 or 32 is what i would like

Trex700e Ray N e- kit & "Fueled By Hate" Head
Next-D Rave Flybarless
Outrage Battery
08-23-2008 03:25 AM
 
 
emag remrofni
Key Veteran
Location: Los Angeles California

3dx,

You're gonna make inkspot a head?

The best Torque Tube is a belt.
08-23-2008 03:58 AM
 
 
ChrisT88
Veteran
Location: FL

Quote 
yes it must be 30 to 32mm


This is true if the swash balls are the same distance apart as the Mikado.

What your really trying to acheive is the proper servo resolution. It's important IMO to get this right at the swash to grip vs reducing the ratios at the servo arms.
08-23-2008 03:59 AM
 
 
3Dx
Key Veteran
Location: Monterrey NL Mexico!

Quote 
You're gonna make inkspot a head?


Yes, that’s the idea, I am helping spread his saying “Flybars are for pussies” laud!!
08-23-2008 04:10 AM
 
 
creightoncarr
Key Veteran
Location: Missouri City, Texas - USA

Yep, that's the one. This head is starting to look sweet. I guess I'll be able to use my flybar and paddle to swat flies soon - might as well put it to use.
08-23-2008 04:54 AM
 
 
Jason Adamo
Senior Heliman
Location: Port Charlotte Fl

This looks great! I will want one to! You shood also look into making the vibe 90 size. I would look at the new vibe 90SG and model it from that. I really want to make the 50 flybarless to see how i will like it but did not know what head setup to use so this is looking very nice.
08-23-2008 06:03 AM
 
 
ChrisT88
Veteran
Location: FL

Now thats more like it

I would start looking at the swash driver arms (washout arms) next. The short throw on the arms will surely bind up before sufficient pitch + cyclic is acheived. Keep in mind that now the washout base is fixed in position so the swash driver arms MUST be longer to avoid binding.
08-27-2008 06:07 AM
 
 
3Dx
Key Veteran
Location: Monterrey NL Mexico!

Hi Chris

Yes, you are 100% correct; I totally understand what you are talking about.

So I think it may be better idea to reduce the distance from the balls on the main grips to have short throw to avoid binding on the washout arms and compensating ratios at the servo arms to have the best servo resolution.
The idea is to use vibe components and dose washouts are from a vibe but trimmed.

What do you think????
08-27-2008 06:36 AM
 
 
3Dx
Key Veteran
Location: Monterrey NL Mexico!

I will do a full assemble and I will simulate tomorrow.

Thanks!
08-27-2008 07:08 AM
 
 
ChrisT88
Veteran
Location: FL

Yes that would work but is not ideal for a few reasons.

One reason is the two push pull linkage rods to the T levers from servo arms will cause binding at extremes if the linkage rods are not 90 degree's to servo arms and T levers at 0 degree's pitch and cyclic. You could remove one of the linkage rods used for push pull to eliminate this issue although it defeats the purpose of push pull.

Next the swashplate will see greater interaction during extremes. If you move the balls in on the servo arms and watch cyclic inputs at full + and - collective you will see the swash ball move up and down on the slider more then you would if you were to move the balls out on the servo arms.

And finally, the forces transferred to the servos are greater the closer to 1:1 ratio you go for the swash > grip ratio.


Since you are putting all of this work to make a head and grips I would really love to see it made as close to perfect as possible. Have you also considered that with just a change of the washout arm length and linkage rod length this head design could also be used on the T-REX 600 Electric/nitro/Raptor 50 electric/nitro similar to what Kasama will soon be offering. I would like to see an alternative to the Kasama heads since I have had experience with the Kasama heads in the past and although they work well, it could be better. Kasama also uses weak aluminum that tends to bend/strip easily.


Chris
08-27-2008 07:11 AM
 
 
inkspot1967
rrProfessor
Location: cranston ri.

no keep the grips arms long like in the last pic.

the swash driver arms need to be longer as well like this. just make them longer and attach to the other side.



Trex700e Ray N e- kit & "Fueled By Hate" Head
Next-D Rave Flybarless
Outrage Battery
08-27-2008 01:12 PM
 
 
creightoncarr
Key Veteran
Location: Missouri City, Texas - USA

Quote 
One reason is the two push pull linkage rods to the T levers from servo arms will cause binding at extremes if the linkage rods are not 90 degree's to servo arms and T levers at 0 degree's pitch and cyclic. You could remove one of the linkage rods used for push pull to eliminate this issue although it defeats the purpose of push pull.

Yeah, I guess if the Vibe didn't use the A-Frame for the anti-rotation bracket you could still have the bellcranks at 90 and just compensate by lengthening the pushrods from the bellcranks to the swash. But the A-Frame pretty much locks you in place as far as the position of the swash for zero pitch.
08-27-2008 02:14 PM
 
 
3Dx
Key Veteran
Location: Monterrey NL Mexico!

Yes here what you are talking about….

here you can see at +/-14°



What will be an aggressive setup???? +/-14°???? And haw much pitch for cycle control???
08-27-2008 05:27 PM
 
 
creightoncarr
Key Veteran
Location: Missouri City, Texas - USA

+/- 14 should be plenty for collective. I'd like to be able to get at least 8-8.5 degrees of cyclic all around.
08-27-2008 05:34 PM
 
 
creightoncarr
Key Veteran
Location: Missouri City, Texas - USA

At full negative pitch with cyclic it looks like there is a risk of the driver links buckling in the wrong way?
08-27-2008 05:37 PM
 
 
inkspot1967
rrProfessor
Location: cranston ri.

you want at least 10 or 11deg cyclics not 8 way to low.

just make the swash driver like i said with longer arms like in the pics i posted.

Trex700e Ray N e- kit & "Fueled By Hate" Head
Next-D Rave Flybarless
Outrage Battery
08-27-2008 05:37 PM
 
 
inkspot1967
rrProfessor
Location: cranston ri.

+-14deg pitch is perfect dont need anymore then that.

Trex700e Ray N e- kit & "Fueled By Hate" Head
Next-D Rave Flybarless
Outrage Battery
08-27-2008 05:38 PM
 
 
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