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01-23-2007 05:56 PM  10 years agoPost 1
Aussy

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Cyprus

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Hi Guys , do you know if a Futura SE will take 720mm main blades?

I use 95mm for tail.

Cheers

G3ORG3

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01-23-2007 06:14 PM  10 years agoPost 2
Futurac

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Belgium , Europe

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SE

No it can not

if you change the boom for 850mm ( s4941) you Might use 71-72cm, but then make sure your ratio is correct.

Alex (Formerly Known as RCMarket )

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01-23-2007 06:20 PM  10 years agoPost 3
z11355

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New England

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and why do you want to run such huge blades?

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01-23-2007 09:16 PM  10 years agoPost 4
Aussy

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Cyprus

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Well i upgraded it to a 90 and i have a spare set of 72cm blades

Is 70cm the max i can put on it? I think that my ratio is 7.56

G3ORG3

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01-24-2007 12:17 AM  10 years agoPost 5
tim tompkins

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Boston, Georgia sw Ga. Thomas County

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Depends on how you fly. It is perfectly ok to use 720's if you have good head o-rings. You will never have a problem unless you bang the sticks such as tic-tocs. I have used that set up for a long time but changed to the milli-3 boom which is longer and no problem ever. I even use some longer tail blades, 105's normal and long 115's for really tight feel. I do use the latest milli-3 head parts to keep it tight. That is the three oring cups and the center heim ball.
TimT

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01-24-2007 03:01 PM  10 years agoPost 6
Barney

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Inverness Scotland

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tim

Using the 3 'O' rings from millie 3 will give you softer dampening.

The preffered dampening for 3D anyway is the douuble 'O' ring cups with a couple shims and the centre ball.. there are harder 'O' rings available via RC market also.

I shim it till it is just on the point of nodding at my lowest headspeed 'right at the bottom of an Auto'

Aussy you will find the motor is very easy to 'bog' running that ratio..8:1 is much better with the 90...

Alex I'm sure will chime in but 21T? clutch bell for the Futura If I remember correctly

Best compromise for tails I have found to be the 105's and should give ample tail power for Rippers and the like without heavily loading the motor.

My own preferred setup for both Futura (now gone ) and Millie/Dyna-X is 690's at 1900-1950 for 3D and gives a very crisp feel, 1850 for general flying around

I did read on another post somewhere that the long boom is the only one available these days?

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01-24-2007 11:35 PM  10 years agoPost 7
tim tompkins

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Boston, Georgia sw Ga. Thomas County

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Funny to think that two would be harder than three. We all loved the stiffer feel when we got the first cups with two on the milli then three seems to give a nice feel without the nodding you might get with 2 shimmed too tight. I guess it's a matter of taste. Yes if you still want to use the shorter boom you have to cut the longer one down. I like to run 1850 or 1900 but it will be very good at 1800 for most flying. I really don't fly any of my Robbes as much as I used to . I spent most of this past year flying electric helis.We have no real support here in the USA anymore.Ron Lund has a lot of stuff but he doesn't have the whole range. He carries parts for the ones he chose to sell. TimT

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01-25-2007 09:55 AM  10 years agoPost 8
Sparkhead

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Melbourne Australia

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Its the 25t clutchbell for the 8:1 ratio.


Mick.

Robbe & Futaba.

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01-30-2007 12:23 AM  10 years agoPost 9
fotpc

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Quebec - Canada

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Here is a link with a gearing worksheet.
http://robbeusa.com/Belt.drive.worksheet.htm

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01-30-2007 09:00 PM  10 years agoPost 10
Aussy

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Cyprus

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Thanks for the ifo guys.

I have the 26T clutchbell. Is this ratio too low for the C spec?

G3ORG3

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01-30-2007 09:50 PM  10 years agoPost 11
Barney

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Inverness Scotland

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It will fly OK but peak power is at a very high headspeed therefore it would be very prone to bogging.. The 8:1 25T is the way to go

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01-30-2007 10:12 PM  10 years agoPost 12
z11355

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New England

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26 is going to be quite low.

25 or even 24 is better.

remember

204.4 / <# of bell teeth> = final ratio

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01-30-2007 11:23 PM  10 years agoPost 13
Barney

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Inverness Scotland

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As Z said a 24t would be Ok too..It really depends on what speed you require to spin the blades?

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