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02-28-2012 02:29 PM  9 years ago
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Luis104

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Caracas / Venezuela

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Benzin Torq Tube build
Hello

I`d like to know some details about a Benzin Trainer torq tube build:

1- How much I have to cut froom the steel tube??? and how I have to measure the cut???

2- Bearings positions: Oviously one in the middle, but the other 2 on the ends, how close to the red couplers must go??? next to them??? or a little separate froom the red couplers. If so, how far froom them???

3- Bearings must be glued with green or red locktite to torq tube??? or no no locktite at all??? The manual only say use grease, but other brands allways glue the bearings to torq tube with cyano (carbon fiber tube)

thankyou
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02-29-2012 06:18 PM  9 years ago
Luis104

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Caracas / Venezuela

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anyone???

please help!!! I alrready did it wrong and had to buy replacement parts

Vario, my recomendation:

Maybe I´m yust new with a Vario helicopter, but in my opinion the manual must have a step by step build procedure or at least a text description for the torq tube build, it`s easy to make a mistake with the actual manual.
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02-29-2012 06:37 PM  9 years ago
Christopher J

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Kansas City, MO Californian lost in land of Oz

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when I get home I'll type up a post to explain in detail how to do thisChristopher J
same as I ever was
"Still all set & Flying the original"
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03-01-2012 05:33 AM  9 years ago
Christopher J

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The bearing supports should be a firm fit inside the boom. I didnt have to glue mine. I set one in the center and one a couple inches in from each end. Build one end of the tube complete. Put the small aluminum piece in the end along with fastening the coupler in place. Make sure by this point you have already JB Welded or epoxied the grear box holder to the boom so it's dry.

Install the tube into the boom and install the boom into the mechs. Tighten eveything down on the mechanics end. Now temporarily put the coupler on the gear box end of the tube but dont set it. Now place the gear to it as square as you can and measure the space frome the front of the taillgear box face and the back of the gear box holder on the boom in millimeters, add 1mm. Now pull the torque through the boom a little bit, remove the temporarily set coupler. Now take that measurement with the extra millimeter included and cut that length from the end. Now temporarily reassemble the tail gear side of the tube and slide it back in so it engages at the mechanics. Now instal the tail gear box. If you did it right the gear box should go on with no problem and you will have 1mm of end float between the couplers.
Christopher J
same as I ever was
"Still all set & Flying the original"
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03-01-2012 03:04 PM  9 years ago
Luis104

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Caracas / Venezuela

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thankyou Christopher!!!

this helps me a lot!!! I just wonder why Vario doesn`t glue the bearings to the torque tube. Pilots in my country allways use cyano and have toldme to use cyano to glue the bearings.

About the bearings distance on the torque tube, I have the idea to measure the distance between the bearings in the tail gear box to the bearing of the output shaft on the mechanics with the boom installed. Then I divide this measure in "4" and that is the distance between the bearings in the ends to the bearing in the center of the torque tube. I think this procedure will give equal distance between the bearings froom the mechanics, boom and the tail gear box.

what`s your opinion???

thankyou
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03-01-2012 05:06 PM  9 years ago
payne1967

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uk

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i wouldn't use equal distances between the bearings
i would offset them to reduce the risk of vibration and whipping of the tube
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03-01-2012 06:31 PM  9 years ago
Christopher J

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Kansas City, MO Californian lost in land of Oz

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Different helicopters require different build proceedures. On the Vario helis you don't need to glue the bearings as the holders for the bearings are very snug fit in the boom and the tolerance between the bearing and the shaft is very minimal.Christopher J
same as I ever was
"Still all set & Flying the original"
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05-17-2012 09:52 AM  9 years ago
pitch black

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Singapore

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Whoops, Don't mind me asking a question regarding the torque tube assembly too.
It seems like I gotta chop 43.15mm off the SS torque tube for the benzin trainer.
Anybody have any experience on a rough length before i make the cut?
Slope Soaring not a Crime
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05-17-2012 06:40 PM  9 years ago
doorman

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Sherwood, Arkansas

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💎Sustaining Member
TT Length...
If you follow the post that Christopher J made earlier in this thread to the letter you will have exactly what Vario shows you on the diagram...it is there but a bit tough to figure out the first time....also as stated each has it's own requirment....
Good Luck..Stan
AMA 2918-Team Spin Blades,,Castle Creations, Unique Aircraft
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05-21-2012 10:21 AM  9 years ago
pitch black

rrApprentice

Singapore

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Got it sir!
Pretty daunting the first time i must say
Slope Soaring not a Crime
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