Doozer
Junior Member
Posts: 68
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Post by Doozer on Mar 4, 2011 23:03:32 GMT -5
Hey guys!
Well, I've got a lot on my heli plate right now. I'm working on a Hirobo Nitro, a JS Frenzy Nitro, and my trusty 425. I'm really enjoying myself, but my weekends are disappearing quick. Before I know it, it's time to go back to work. Anyway, I've decided to hold off on the new motor... for now. It's my birthday in a couple of weeks and my kids want to buy me some heli stuff. So I registered at Heli-Direct... lol (not really).
I am going to TT it. I've got the kit in my possession. I have to say that Dumb Thumbs ships fast as hell. I ordered it on Weds and got it today. I qualified for the free shipping and they still sent it priority. Not everyone does that. Most of the time free shipping means 7 day ground.
So, I'll try to remember to take some pics to document the process and add it to this thread... that is unless you think starting a new thread would be more user friendly. Tomorrow is my Friday at work, and I'll have Sunday, Monday and Tuesday to finish it. I want to fly some this weekend as well. I'm hoping to get a nitro in the air (I'm a nitro newbert).
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Post by Jerrymac on Mar 5, 2011 1:56:55 GMT -5
Good luck with the new heli builds. I enjoy building them as much as flying them, but my heli budget is pretty tight so my fleet will remain limited. You didn't mention whether you were going to build your 425 on a HeadHunter frame or not, but, I don't think you can install a TT in the plastic frame. I am fairly sure that the upper bearing on the shaft for the tail drive has to be lowered to accept the front TT gear, and that is not possible on the plastic frame. On the Gaui CF frame there are 2 sets of holes for the top bearing mount on the shaft for the tail drive. One for a belt drive and one for a TT drive. Someone correct me if I am wrong. Feel free to start any new threads that you like. Personally, I think it is easier for others to find the info they are looking for if it is in a thread that is more specific to what they might want to find out. Glad someone has nice weather to go fly. It will be winter here for another month or so, then windy and rainy for the next couple.
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Post by dunkonu23 on Mar 5, 2011 10:40:40 GMT -5
Jerry's right. Unless you use a CF frame, be that frame HeadHunter or Gaui, you're out of luck. The top bearing has to be lowered. Bill went through this when we didn't know and found out the hard way. Hang on to your torque tube. It will work with a CF frame.
Scott
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Doozer
Junior Member
Posts: 68
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Post by Doozer on Mar 6, 2011 14:54:35 GMT -5
WoW! Yep, I did a lot of checking after I read what you guys posted. The upsetting thing is the item descriptions do not make any distinction. Dumb Thumbs say "for EP 425 series." To me, that means everything that has Hurri 425 on it. I had read dubes thread on this forum and at heli talk. I just thought it was a carbon frame issue for some reason. Yeah Scott, not this pay day but next if you haven't sold that last older version of the HH frame, I'll take it. The one with the old aluminum. I guess this means I'll need to get the cnc head too. WILL BUILD HELIS FOR FOOD!
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Post by dunkonu23 on Mar 6, 2011 18:07:22 GMT -5
Thanks! LMAO!! Will build helis for food! LOL! Tooo funny. Some days I feel like that, too! Scott
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Post by Jerrymac on Mar 6, 2011 18:10:14 GMT -5
Unfortunately, it is not really RC DumbThumbs fault. They just use the description that Gaui provides, just like AlleRC does. If you look at the dealers, all of the descriptions are identical.
It would be nice if the dealers could build and test all of the products they sell, then they could add their own 'comments', such as, in this case, " TT conversion fits CF frames only". That would save people a lot of confusion, but in the end, it is really Gaui that should make the product descriptions more clear.
Just my opinion....
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Doozer
Junior Member
Posts: 68
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Post by Doozer on Mar 6, 2011 20:46:47 GMT -5
Unfortunately, it is not really RC DumbThumbs fault. They just use the description that Gaui provides, just like AlleRC does. If you look at the dealers, all of the descriptions are identical. It would be nice if the dealers could build and test all of the products they sell, then they could add their own 'comments', such as, in this case, " TT conversion fits CF frames only". That would save people a lot of confusion, but in the end, it is really Gaui that should make the product descriptions more clear. Just my opinion.... I totally agree with you Jerry. I shot RC dumb thumbs an email and asked them if they knew, and let them know about the posts in several threads on a few different forums. The email I got back from Mark kind of passed the buck a bit (read: blamed Gaui), but he did offer to give me credit So now they know, and if they don't change it, the next one is on them. I just wish I would have completely researched to upgrade first. Not that I should have to do that, but I guess I have to do that. I'm going to keep the TT upgrade and use it on the HH.
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Post by Jerrymac on Mar 7, 2011 3:30:43 GMT -5
Hey Robby, speakin of Dube, how is he doing? Haven't seen him back on here for a very long time. I pop in over at RC Heli Talk once in a while, but, since most of my helis are Gaui's I don't find many other Gaui owners over there to talk to.
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Doozer
Junior Member
Posts: 68
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Post by Doozer on Mar 7, 2011 8:17:44 GMT -5
The last time I heard from him was the middle of January. He was trying to sell his Raptor that he'd never flown. I'm not sure if he's getting out or just taking a break. I know I have to step back once in a while because life gets in the way.
The guys on Heli Talk are a great group of guys, but a little less adventurous when it comes to helis. Dube was different in that respect. A lot of them fly TREX or TREX clones like EXI, or HK's. I try to nudge them in other directions from time to time. However, Align has done a great job of marketing their product, and has a strong foothold in that forum. I'm not trying to bash them or Align, I just think that there are many alternatives to that head design that are far more tunable and user friendly.
Guai, Outrage, LAheli, Thunder Tiger, and JS, to name a few, all have better head designs than Align in my opinion. The Gaui Hurricane series has to be the cheapest yet most versatile heli I've owned. The head is tunable; numerous motor/blade/gear combinations; tons of room for electronics; parts are dirt cheap; and pardon the cliche here, but it flies like it's on rails. I think people look at the basic kit and get scared off by the price. How could something that's $75 bucks fly that well? If they only knew ;D
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Doozer
Junior Member
Posts: 68
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Post by Doozer on Mar 8, 2011 14:01:23 GMT -5
Ok... I put the metal pitch slider, hub and grips on the tail, but now the plastic tail housing is rotating counter/anti clockwise. I opened it up and it still has a little nub inside, though it looks worn. The boom is still in good shape. Should I just go ahead and get the cnc tail box? Would buying another plastic one most likely end up with the same result? This tail box has about 50 flights on it which doesn't seem like a lot to me. I think I know the answer just looking for your thoughts.
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Post by dunkonu23 on Mar 8, 2011 20:54:04 GMT -5
That's a good question. I never used the stock tail. I think the stock tail assembly has the nub to "pin" it in place. I can check the parts I have here to make sure, in the morning. Scott
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Post by Jerrymac on Mar 9, 2011 0:40:04 GMT -5
There is an easy fix for that. Just drill a small hole thru the tail case and boom and put a small screw in it to keep the case from rotating. Just make sure the screw doesn't touch the belt.
You might even have to do this with the cnc case too, as I think I remember Scott's cnc tail case rotated on the boom once while in flight.
I had to do this on my new HeadHunter build as the plastic case could be rotated very slightly even though the "pin" looks ok.
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Post by dunkonu23 on Mar 9, 2011 10:47:59 GMT -5
Forgot all about that, Jerry. Thanks for reminding me about my pinning! Scott
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Doozer
Junior Member
Posts: 68
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Post by Doozer on Mar 9, 2011 17:51:01 GMT -5
The screw idea gave me an idea of my own. I was thinking of using a rubber canopy grommet in the hole on the boom. The nub should ride in the hole in the grommet, and friction should hold the tail in place. If the belt does rub, the potenial for damage is much less than if I used a screw. I'm at work and i can't try this out right now, but i think a 600 grommet should work.
Thoughts?
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Post by dunkonu23 on Mar 9, 2011 18:07:04 GMT -5
It would certainly act as a vibration damper of sorts. Dunno if it would stand up the torque. Seriously, I've had a tail assembly rotate nearly vertical with the blades facing down. It took a lot of torque to do that and the tail can produce it. I use a cut-off servo screw to pin the boom. My Fusion 6 uses two M3 screws to both hold the tail stab in place and pin the boom. Using a screw is okay if you keep screw length in check.
Scott
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Doozer
Junior Member
Posts: 68
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Post by Doozer on Mar 9, 2011 18:46:12 GMT -5
I'm thinking you're right. It took quite a bit of elbow grease to move the tail box, but when i spun it up the box acted as if it was greased. I'm still going to try it. I'll let you know how it works out.
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Doozer
Junior Member
Posts: 68
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Post by Doozer on Mar 9, 2011 23:30:18 GMT -5
It worked. I used a Trex 600 rubber canopy grommet. It fit int the hole perfect. There wasn't much screw left to put the vertical stab on, but I pinched it tight and got the nut on. I screwed it down really tight then took it outside. Spun it up and watched the tail...no movement. I put in a hover, watched the tail.... no movement. I did some piros both ways... perfect. Set it down and checked it and it was still in the same place. Then I ran out of light. I'll try to fly it tomorrow if I can get home in time. If I can't I'll at least fly it this weekend then pull the tail apart and take some pics.
Do I trust it? I'm not so sure. I still think the screw idea is better, but in the name of research (or stupidity) I'm going to try to fly with it.
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Post by kahn10 on May 12, 2011 1:09:08 GMT -5
hey doozer...if your planning to stick with the plastic frame the brace jerry has in his is a very good idea,especially if you stretch it.grab your motor in one hand and your head in the other and move the head left to right to see why....here's a little read if you can be bothered www.helifreak.com/showthread.php?t=88363&highlight=stiffy .... also a mod on the plastic frame to grunt up the owb shaft bearings www.helifreak.com/showthread.php?t=101767 which tend to fail after a while ...don't get me wrong i love the hurri hard these are just a couple of improvements we came up with a while back
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