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Helicopter
e-
Century Radikal E640 - Swift 16 NX
› 3D pro belt drive conversion plus..
11-30-2005 02:07 AM  12 years agoPost 141
RCRacer

rrNovice

Denver

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Boy I need to re-read my post better.

6) If the tension is too loose, the belt will jump the teeth on the tail pulley under load. As you power up the tail will loose power.

Other Items I didn't think of before. With the belt off the main pulley does the main blade turn freely. Is it rubbing anything, all parts are pretty close fit and have had the main pulley rub the screws that mount the mast. With the belt off the main pulley it should spin for a long time. I suspect it's possible to over tighten the grub screws and rub the belt inside the boom.

To check for boom and tailbox for rub, power it up for 10-30 seconds - shut down and check the boom and tailbox for any heat. It should not have gotten warm, if so you have found the problem area. When the belt rubbed the tailbox in the past that area was hot quickly.

I am running the stock himax motor and did not notice any loss of power when I switched over.

Please let me know what you find.

Ron
RC-Helitech

Must fiddle with everything!

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11-30-2005 02:26 AM  12 years agoPost 142
upperking

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Spring Hill, Florida

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Heres a video clip of it taking off.
http://www.upperboard.com/beltd.wmv

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11-30-2005 03:09 AM  12 years agoPost 143
rerazor

rrElite Veteran

Mich.

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Take the belt off and see if it spins freely?

Tail spin freely without belt on?

When you run it up is there any heat on the boom, mount, tail box?

Set the belt on the loose side so it will skip if you turn the mainshaft and hold the tail. You will know when its to loose and begins to slip on hard climb outs etc...

Check to see if the main shaft is binding (frames to tight together etc.?)?

Looks like the tail is holding well in the video but you should have the same power etc.. as before so something is not adjusted right.

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12-01-2005 01:50 AM  12 years agoPost 144
upperking

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Spring Hill, Florida

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all and all its a great replacement for the tail drive, very smooth and quit.
needs a little more power from the motor to run it. I tried the stock century brushless and its a little under powered..

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12-01-2005 03:34 AM  12 years agoPost 145
rcworm

rrNovice

Ontario Canada

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Upperking,
did you end up using your MH metal tail gearbox? Or did you use the gearbox with the belt conversion?
ian.

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12-01-2005 01:22 PM  12 years agoPost 146
upperking

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Spring Hill, Florida

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I used the tail that came with the beltdrive kit.Im going to try the MH tail tonight..
You have to drill out the bearing hole in order to make room for the belt..

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12-01-2005 01:51 PM  12 years agoPost 147
rerazor

rrElite Veteran

Mich.

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I still find it strange that you have less power w/ the belt drive. My setup spins very freely with minimal drag.

You never answered the questions from my previous post to see if you have drag somwhere?

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12-01-2005 02:05 PM  12 years agoPost 148
upperking

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Spring Hill, Florida

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I was able to put the MH tail box on with the belt drive and it seems to work great.
I had to bore the hole out to make it larger for the belt to come through by removing the bearing and then using a 5/16 drill bit and I did it by hand easy enough..




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12-01-2005 11:22 PM  12 years agoPost 149
upperking

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Spring Hill, Florida

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5/16 drill bit is a perfect bore for the MH cnc tail
no rub and also it makes the HM tailbox even lighter with some of the meat drilled off.. this should be alot lighter then the stock tailbox :P

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12-01-2005 11:41 PM  12 years agoPost 150
upperking

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Spring Hill, Florida

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doh

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12-02-2005 01:05 AM  12 years agoPost 151
upperking

rrApprentice

Spring Hill, Florida

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I figured out why the loss of power.
The front two mini pulleys where ridding to low and the belt was ridding a little off the top causing it to rub against the top plastic piece, so I tightened the screws for the pulleys till they had no up and down play and now i have all power back..
BUT since I tightened the pulley screws you can see its bending the bottom part of the plastic case up-ward and I think that’s a little to much stress. Either taller pulleys or the plastic case cap needs to be smaller or even some spacers for the pulleys to center them????
If I loosen the screws the belt still rides high rubbing the top and the pulleys ride low and don’t center the belt..

Or it might be because I don’t use the tail boom supports causing the tail boom to dip down a little causing the belt to ride higher on the front pulley maybe?!?!

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12-02-2005 01:48 AM  12 years agoPost 152
rerazor

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Mich.

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That does not look right. You should not have to tighten the screws to the point that it distorts the mount. I would take it all apart again and check the alignment.

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12-02-2005 05:07 AM  12 years agoPost 153
upperking

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Spring Hill, Florida

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I think the tail boom holder should be made from aluminum or something stiffer.. even the stock boom support did not allow the tail boom to dip down this far..
with the stock crown gear setup the long rod that went through the tube gave it stiffer support., having a flimsy belt inside the boom instead will cause the support to weaken causing for a tail support a must!!
this explains my loss of power.I can put my two boom support rods on to straiten it out some what but I still dont like the loose fit pulley idlers and the weakness in this part shown in the picture..

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12-02-2005 05:38 AM  12 years agoPost 154
love2fly

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McMinnville Oregon USA

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I put spacers under the pulleys. I ordered the Trex parts bag just for the extra parts and have found many uses for this stuff, the spacer i used is a brass part in this kit bit you what ever you have
My tail box got here today, I've already built my own tail box so I could fly my Pro and after looking at them both I will continue to use my own design. By the way mine is liter as well.
I have been doing a lot of work on my pro and have had my boom off a few times and have found that the boom hole is not centered left to right and is height as well. I'm not Sher the purpose?
I will put up pics on Monday, A pitcher is worth a thousand words.

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12-02-2005 02:02 PM  12 years agoPost 155
rerazor

rrElite Veteran

Mich.

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Up,

Take a pic from the side so we can see the angle of the boom/pulley/mount. Those boom supports are a joke with the press fit that Century uses. Maybe you have a defective mount because everything should line up level and straight.
How far do you have the boom in the mount? I put mine as far forward as possible and adjusted the tension with the tail case. My boom was almost touching the idler pulleys. I still think the those pulleys don't look like they fit right either.

Maybe others can chime in and see if they are having the same problems.

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12-02-2005 02:17 PM  12 years agoPost 156
RCRacer

rrNovice

Denver

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The boom support doesn't look right. I am working on an Alum version but that will be a several more weeks off. For the current customers there will be a cheaper upgrade price available, when it's available. My biggest goal on this upgrade was to keep the cost down and produce something that works.

I have changed the way I mount the idler pulleys over this production run. I am now using two small washers, one top and one bottom on the boom adapter to better center the idler pulleys. I will get a picture over the weekend to illustratate. This might work better than what I did on yours. I have also found no washers or other support was just as good, the pulleys would just ride where they needed, the boom is really what centers the belt.

Let me know if the boom is pointing down. This is something that we have to watch during production. If you have this problem let me know, I tried to check each one before shipping. The learning curve from taking this from prototyping to production has caused more problems that I expected.

That is interesting that the MH tailbox is lighter that the plastic one. Does the modified MH unit grab the boom so as not to slip? I have been considering a Alum version of the tailbox as well, I ws not sure how well they hold up.

Thanks for the input.

Ron

Must fiddle with everything!

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12-02-2005 09:07 PM  12 years agoPost 157
friz

rrNovice

Great Bend, KS

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If you do an aluminium one, put more meat in it than the MH unit. It is very fragile. BTW got the tracking number for my belt drive yesterday. Yahooooo.....

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12-03-2005 04:25 PM  12 years agoPost 158
RCRacer

rrNovice

Denver

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After the first few kits where released I changed the way the bearings are spaced inside the adapter.
I now use some simple washers just too keep the bearing from riding against the plastic.

The bearings are needed to direct the belt into the boom, the boom will center the belt and the bearings should follow the belt. I have found it better to leave the bearings slightly loose so that they can move.

I have also noticed the boom being very weak, I have bent several booms when running the gear system as well as the belt system. I can't say the shaft supports the boom any, but it might. The cause is really the low grade alum used for the boom and the very thin wall. Hence why Century now offer a two pack of booms.

I have not been able to locate a supplier for CF in the correct sizes, this would seem to be the best choice. The ID can't be any smaller !
Both the boom adapter and the tail box can be modifed to work with a Shogun boom that is 1mm larger in diameter. I have not run this setup and don't know how much stronger a shogun boom is. This might be a choice in the future! This option has been second as you would need to change some other HB parts to use the larger boom. Servo and fin mounts would need to change.

Ron

Must fiddle with everything!

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12-03-2005 09:27 PM  12 years agoPost 159
upperking

rrApprentice

Spring Hill, Florida

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Im going back to the crown gear, I had more power !
This is a great idea but i think I bought the beltdrive to early
I smoked a motor with this unit and there is no way to get the belt to center with out it dragging on the top part of the idlers mount!
Frusterated

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12-03-2005 10:01 PM  12 years agoPost 160
friz

rrNovice

Great Bend, KS

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Sorry to hear you are not satisfied. I was hopeing the belt drive would get me back in the air

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Helicopter
e-
Century Radikal E640 - Swift 16 NX
› 3D pro belt drive conversion plus..
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