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HelicopterHIROBOHirobo Sceadu › putting longer tail boom ?
12-03-2011 11:46 PM  5 years agoPost 1
400 flyer

rrApprentice

maryland, usa

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hello all,
was thinking, im going to get the outrage v50 tail boom its 710mm long were as the evo50 has a 695mm long boom. now heres the ? is there a hirobo belt i cound use? and what size do you think ill need??

the boom is 15mm longer.

i know these eazy path would be get the tt drive set and get a longer c/f tub but would like to keep it belt for now.

heres a nother ?
on a bag for a stock ev050 belt it says (60s3m1572 ) is the 1572 the size of the belt??

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12-04-2011 01:17 AM  5 years agoPost 2
Leif

rrElite Veteran

USA

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Not sure exactly WHY you would want to stretch the tail on a 50-class Hirobo, but I did some research and I'm pretty sure that the code on the package is a standardized sizing code for "timing" belts.

60 means 60mm wide
3 means 3mm tooth
1572 is the total length of the belt in mm

Since the belt is circular, simple math can be used to figure out the belt length for a different boom length:

1572/2= 786
of this, 695mm corresponds to the boom length
leaving 91mm length for each "end loop".

For a 710mm boom, you would add two times the additional boom length to the previous 1572: 710-695= 15, 15x2=30, 1572+30 = 1602.

Looking in an industrial belt catalog, I can find the 60s3m1572 belt, but there is no corresponding 1602mm length.

The closest length is 1596mm, with a part number of 60s3m1596. A search for this part number leads to: JR61218 JR TAIL DRIVE BELT S3M1596 (SY-50), which is the drive belt for the JR Airskipper.

There is sufficient adjustment range in the tailboom mounting to accomodate the slight difference in length. The difference corresponds to a 3mm movement in the boom relative to the frame and that's easily within the normal adjustment range.

Hope this helps.

Leif

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12-04-2011 09:26 PM  5 years agoPost 3
rudyy

rrElite Veteran

E. Amherst, NY

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Get a pipe cutter (abour 10 bucks) under plumbing section from Lowes or Homedepot to cut it down to 695mm.

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12-04-2011 09:34 PM  5 years agoPost 4
400 flyer

rrApprentice

maryland, usa

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leif,
thanks so much for that info, i was thinking how i would figure out the size i needed for the belt. from your info it looks like if i want to keep the 710 boom ill have to go tt drive but right now im not going to do that. ill just cut it down to the size i need and be happy.

i was just going to do something diffrent thats all.
when i go tt ill do the 710 would like to go bigger but not sure how big i could go on a evo50 without putting a pound of front for balance.

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12-14-2011 01:52 AM  5 years agoPost 5
Blue Angel

rrApprentice

Redford, Mi - USA

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Leif: The width can not be 60 mm, because 60 mm is 2.36in. 60 must stand for something else. Take another stab at it.

Blue Angel

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12-14-2011 03:53 PM  5 years agoPost 6
Agilefalcon

rrKey Veteran

Fort Worth, Texas

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I don't really think you need a longer tail boom. I'm flying one of my SDX with 620mm Fun Key RotorTech blades with zero issues (in combo with 95mm tail blades).

The tail is rock solid, no matter what I put the heli through.

Head speed is about 1900.

If you are having problems with the tail holding, look at the following.

Friction in the tail control push-rod.
Belt tension - not loose, but not tight either!
Tail blades - 95mm is ideal on the SDX for 3D. I like broader chord blades with unswept or nearly unswept tips.
Head speed - 1900 and up is good for aggressive 3D. Head speed also translates to tail power.
Servo travel limits - ensure you have stop to stop travel without binding or friction at any point.
Servo arm length - 17mm or there about seems to be fairly standard.
Gyro gain - adjust to the highest possible without oscillation in your maneuvers or high speed flight.
Tail servo power - make sure you servo is getting the correct voltage.

Chris

Chris Berardi
Team BobbyJack's Hobbies

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