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HomeAircraftHelicopterHIROBOOther › Evo 90 Tailboom Twist
10-16-2005 11:53 PM  12 years agoPost 1
area51

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Rohnert Park, CA

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Have any of you experienced a brand new tailboom that has a slight twist in it? I was just checking over my almost finished Evo and noticed that the t/r output shaft is not perpendicular to the mainshaft. I took a closer look at the tail case and then put the fins on as well and sure enough, it is ALL twisted clockwise when looking at it from the rear. With the octagonal boom locked in the frames, there is no way to fix this other than ordering a new boom from Hirobo. Right???

area51

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10-16-2005 11:54 PM  12 years agoPost 2
mrNoodles

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Borlänge, Sweden

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Doesnt sound normal.
Contact Jeff Green at MRC.

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10-16-2005 11:57 PM  12 years agoPost 3
area51

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Rohnert Park, CA

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Thanks Noodles. Definitely not normal but just a pain in the butt at this point! Will contact Jeff to get a new boom.

area51

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10-17-2005 01:24 AM  12 years agoPost 4
rdalcanto

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Salt Lake City, UT

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Are you sure the boom is properly seated. I remember a post of someone who thought their carbon boom wasn't straight, and after they played with it a little, it turned out to be fine....

Rick

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10-17-2005 05:16 AM  12 years agoPost 5
area51

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Rohnert Park, CA

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Good suggestion Rick. I've already tried removing the boom and then reseating it and coaxing it a bit but I get the same result. Should have a new boom here this week.

area15

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10-17-2005 08:37 AM  12 years agoPost 6
wisebob

rrApprentice

US

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I don't think a new tailboom will solve your "twist". I had the same twist and my friend who built another Evo 90 had the same twist too.

I had an older Freya and it never had the twist when I built that. The tailbooms have not changed.

My guess is it is probably a "defect" the Evo 90 frame molding for the tail boom. It was darn hard to get the tail boom into the frames too!

bob

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10-17-2005 12:57 PM  12 years agoPost 7
Razz

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Louisville, KY

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area51
I had the same problem with my kit. The tailboom actually had a slight twist in it, which caused my tail rotor shaft to be misalinged! I also had a very hard time sliding this "twisted boom" into the frames...very tight!

Jeff sent me a new boom, that boom was straight, and it fit into the frames nicely!

Brian Rasmussen

DX8, Ballistic FSO, Gaui X5, Warp 360, Vbar

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10-19-2005 11:07 PM  12 years agoPost 8
tomthumb

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Glendora California

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I can't seem to get MRC to even call me back. I have the same twisted boom problem. I had no idea customer service was this difficult with MRC. 2 phone calls and 1 email over 3 days and no response? I would have got a Raptor 90 if I knew I would have support issues with the importer! Oh well, maybe I'll just order one. First crash part and not even a crash yet.

Jason

LOWER LOWER DOH!!!

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10-20-2005 12:03 AM  12 years agoPost 9
rdalcanto

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Salt Lake City, UT

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Jeff is at the show in L.A.. You probably won't get a reply until next week. Normally he is very fast.

Rick

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10-20-2005 12:06 AM  12 years agoPost 10
tomthumb

rrApprentice

Glendora California

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Is Jeff the only Tech support? I live in Los Angeles. I should just go there and see him. I'm sure he will help me out. Thanks

LOWER LOWER DOH!!!

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10-20-2005 12:12 AM  12 years agoPost 11
SolarXtreme

rrVeteran

Arroyo Grande, CA

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I have a slight twist in my tail as well. It is the insert into the frame that is the problem. You really have to work at it to get it perfectly straight. Loosen the boom supports and boom frame bolts and have a friend twist the boom until it is straight and carefully tighten down the primary bolts. Make sure the boom doesn't slip when tightening and alternate tightening between top and bottom bolts until fully tightend.

The internal molding is not very good at the rear of the upper frames on the EVO90. It is like wrestling a bear to get the boom into the frames. With enough persistance you can get it straight it's just a pain if you are also trying to mantain belt tension. GOOD LUCK

I am tempted to try flipping the boom upside down and see if I can get the alignment to change.
.

I picked a hell of a day to quit drinking

Avant EFX
Freya EVO

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10-20-2005 01:36 AM  12 years agoPost 12
area51

rrNovice

Rohnert Park, CA

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Thanks rdalcanto and solarextreme. That explains why Jeff hasn't returned any of my emails either. For now, I will do what solarextreme suggested and see if I can get it rotated around any straighter. I will let everyone know how it works.

area51

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10-20-2005 05:56 AM  12 years agoPost 13
tomthumb

rrApprentice

Glendora California

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Tried the twist thing with my wife. Then we worked on the heli. The boom is better but my frigging back is killing me. That's what I get for marring a nympho. I will speak with Jeff Green at the show this weekend. I will mention there seems to be a bit of a problem here. Thanks for your advise SolarXtreme! At least I can fly it now

LOWER LOWER DOH!!!

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10-21-2005 05:49 AM  12 years agoPost 14
area51

rrNovice

Rohnert Park, CA

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Just wanted everyone to know that even though I haven't heard anything back from my emails to Jeff because he is at the show, I did however receive a brand new tailboom in the mail today. I am very impressed with the customer service even though he is out of the office. Somebody is reading the emails.

Now that I have a new boom in hand, I will try installing that first. If it is the same, then I will give solarextreme's method a shot.

I like your priorities tomthumb! The twist with your wife first then working on the heli...life is good! Let us know what Jef says about the problem when you speak with him this weekend.

area51

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11-08-2005 09:07 AM  12 years agoPost 15
area51

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Rohnert Park, CA

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Installed my new boom and wanted everyone to know that in my case, it was the boom that was slightly twisted. With the new boom, everything aligns perfectly.

Did Tomthumb speak to Jeff at the LA show? Was wondering what Jeff said about this problem, if anything.

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01-02-2007 12:29 AM  11 years agoPost 16
Louisiana Helicam

rrKey Veteran

West Monroe, LA

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Crap, my new Avant has a twisted tail boom as well. I guess I'll have to order another one now.

www.louisianahelicam.com

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01-02-2007 02:08 AM  11 years agoPost 17
yapjy

rrKey Veteran

Singapore

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I had twisted tail booms too.

But it seems that the twisted tail booms doesn't affect the flying.

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01-20-2007 11:17 PM  11 years agoPost 18
Louisiana Helicam

rrKey Veteran

West Monroe, LA

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By the way, my new tailboom isn't at 90 degrees as well. I wish someone made a round boom kit so I could turn it myself.

www.louisianahelicam.com

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