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Helicopter
e-
Century Radikal E640 - Swift 16 NX
› 3D pro belt drive conversion plus..
12-03-2005 10:57 PM  12 years agoPost 161
RCRacer

rrNovice

Denver

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Im going back to the crown gear, I had more power !
Sorry to hear of the problems,I am willing to purchase the unit back to see what happened. I have been learning from the problems.
Most are reporting very favorable results with the belt drive.

Just let me know.

Thanks
Ron
RC-Helitech

Must fiddle with everything!

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12-03-2005 11:19 PM  12 years agoPost 162
alanhsu

rrKey Veteran

Vancouver, Canada

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Have you looked at the Maxir boom?
It has the same OD Not sure about ID.

My HB has the Maxir boom on, I want to try your belt drive but I am not sure what length belt to get.

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12-03-2005 11:23 PM  12 years agoPost 163
friz

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Great Bend, KS

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It would be nice if the successful ones would post.

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12-03-2005 11:27 PM  12 years agoPost 164
alanhsu

rrKey Veteran

Vancouver, Canada

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na

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12-03-2005 11:27 PM  12 years agoPost 165
alanhsu

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Vancouver, Canada

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guess they are too busy flying ... haha...

I really want to try this out, just need to figure out which belt to use first before buying it for my extended boom hb.

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12-03-2005 11:27 PM  12 years agoPost 166
alanhsu

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Vancouver, Canada

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I've never tried the this belt drive out, so I can't speak in particular for it.

However, knowing these tail drive systems in general, I have to say reduction in power is not something people can use to attack this particular belt drive system.

It is almost common sense that belt drives are less efficient than shaft driven counter part. What belt drive offers is reliability and ease to setup. So as long as this system is reliable and easy to setup, I can't complain.

The truth is.
If the shaft driven tail parts of 3Dpro are as good as they looked on the computer, no one would even think about building belt drives.
The problem is that, since we are dealing with micro helis, the tail parts are so little that machining are never perfect and parts are often weak.

I personally would love 3D pro's shaft drive design if all the gears are perfectly molded and that tiny scrub screw is replaced by a beefer one, No belt drive would EVER beat it's performance.

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12-03-2005 11:41 PM  12 years agoPost 167
friz

rrNovice

Great Bend, KS

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I suppose that the parts do have enough plastic that they could be reamed out to fit a bigger boom

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12-03-2005 11:56 PM  12 years agoPost 168
friz

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Great Bend, KS

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who is a good vender for LA Heli? I may just give up on the pro

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12-04-2005 12:14 AM  12 years agoPost 169
zoom

rrElite Veteran

Galveston, Texas

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What size washers are those? I have not installed my kit yet.

Predator, Raptor 30, TRex CCPM 450TH, 3D Pro 400F

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12-04-2005 12:26 AM  12 years agoPost 170
RCRacer

rrNovice

Denver

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I suppose that the parts do have enough plastic that they could be reamed out to fit a bigger boom
Yup, that is how they where designed. To be honest, with the weather that we have had, work being crazy, and the heli parts, I have not flown in some time now. I have a set of parts ready for a shogun boom and have not had time to test it.

Per request I can produce the parts for the 9mm boom used on a shogun. I ran across a 9mm CF boom some time ago, not cheap but it should work. I don't remember the vendor ! I think the larger boom would be an improvement to the system.

I am considering how to perform a simple load test using the Belt and the gear system.
I will try to mount a small prop from my old HB CP on the tail, and measure the RPM compared to the Amp draw with both systems. This should give a reasonable judgement on how they compare. This would be with the main blades removed as not to change the main pitch.
This will not be quick as I will need to order a tailbox and a crown gear. After over 4 months I never did get the replacement from Century as promised on the website.

In the event the belt is not as efficent, for the novice pilots like myself I have already saved a ton of money in gears and tailboxes.

BTW I did get a message from Cuda.
charger's beepin'...im out to fly
Wish that was me !
Ron

Must fiddle with everything!

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12-04-2005 12:41 AM  12 years agoPost 171
RCRacer

rrNovice

Denver

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What size washers are those? I have not installed my kit yet.
#2 washers, the ones I have are from McMaster Carr #98019A300. Approx sizes .250" od x .094" id - .016" thick. The size is not critical, there will still be a gap when they are installed with the bearing inplace. You want the bearing to be able to move with the belt.

After you install the washers look between the bearings, you want the boom hole to be centered.

If you need some washers I am more than happy to send some out, I have a bag of 500 of them.

Ron

Must fiddle with everything!

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12-04-2005 01:04 AM  12 years agoPost 172
upperking

rrApprentice

Spring Hill, Florida

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I just want a belt Drive that works!!
Crown gears suck no matter what but they still work as long as you don’t hit the tail on the ground to hard...

I took the stock tail boom holder and put it on by first taking out the bearings then reaming it out with a 5/16 drill and put the belt through and it did fit center only there are no idler pulleys so it rubs the sides. I would think that your boom should be made more like the stock the way it mounts.

I think my belt drive kit is either defective or something has to be done to center the belt drive so it does not ride high...
even when I try to straiten the tail out it still rubs the top,
I think some of the thickness on the roof above the belt needs to come off and maybe you should try to top mount it so no plastic is above the belt....
I can’t believe none of your tester's caught any of this stuff!?!?!
I am willing to test. Believe me if anything will go wrong I always find it
:P

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12-04-2005 02:51 AM  12 years agoPost 173
cudaboy_71

rrElite Veteran

sacramento, ca, u.s.

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i think i have a suggestion for upperking.

looking at that last picture posted, the screws that hold the bearings are WAY too tight. i just looked at mine and the ends of my threads are almost flush with the bottom of the boom mount...maybe 1 thread showing. UK, yours look like theyre showing about 1/16" (i can count 4 threads showing in the pic), which is also causing the mount to compress on the bearings and causing them to bind. my bearings wont even turn when i cinch them down that tight (just tried now to emulate UK's setup).

this will also cause the entire boom to point down, which i seem to recall you mentioning as well.

in my case, i have my gryo mount above these screws, so i'm not worried about them loosening and coming out as there's no room. even so, i've never had them back out....i only have them tightened enough to be flush with the countersink. when i spin the bearings with my finger (while the mount is uninstalled in my hand) they freely spin and even wobble a little. the belt running over them eliminates the wobble. no need to eliminate it by over torquing the screws.

if you still feel like tinkering i'd be curious to hear if that has any affect.


FYI, i'm thinking about the MAXIR for my next bird. AFAIK, icare is the only n. american distributor. i think there's a distributor in canada as well. but, i think the two owners are friends or otherwise affiliated.

if it ain't broke, break it.

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12-04-2005 03:03 AM  12 years agoPost 174
upperking

rrApprentice

Spring Hill, Florida

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I tightened the screws to move the pulleys up to match the belt ride height.. other wise the pulleys ride to low and the belt rides high and do not ride fully on the idler pulley. The Belt rides to high and cannot be lowered with the setup I have..
By tightening it actually helped freeing up the belt a litte so it rode the pulleys but it still rubs the top.
I did put boom supports to hold it up strait but that did not change how the belt rode to high ..

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12-04-2005 03:20 AM  12 years agoPost 175
cudaboy_71

rrElite Veteran

sacramento, ca, u.s.

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where the belt rides is dictated by the location of the boom exit. and, the guide pulleys are aligned with the boom, so i'm not sure i understand how it could ride anywhere else on the 48t pulley.

dont get me wrong; im not calling you a liar or saying you're not doing everything per the instructions. im trying to help you troubleshoot this thing.

but, i just dont get how they couldnt align....the setup is self aligning. i mean, i see from the last of your photos how the belt is running really high on the 48t....mine runs at the bottom on the flange. i think if you loosened those screws and let the pulleys and the boom mount relax, the belt would ride lower.

just a suggestion. i can post pictures of mine later. i actually have it all apart on the table right now inspecting everything. mine all looks fine. a little wear on the belt. i'm gonna keep my eye on that.

if it ain't broke, break it.

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12-04-2005 03:21 AM  12 years agoPost 176
rerazor

rrElite Veteran

Mich.

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UP,

Did you run it with the idler pulleys loose (screws not so tight/mount not distorted)? The idler pulleys will follow the belt. I just don't see how your having that much of a problem. The original prototypes were far from perfect and still managed to run smoothly even if there was some rubbing. I would try again with the mount screws not so tight and maybe try to add a small dia. washer to make up for the space.

Not trying to drag this topic on but I would really like for you to have the belt drive work like it has for me and others. I could not imagine going back to the stock setup .

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12-04-2005 03:50 AM  12 years agoPost 177
cudaboy_71

rrElite Veteran

sacramento, ca, u.s.

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worst case, maybe your boom mount was milled a few thousanths off....just take a file and take off a little material in the top of the boom mount where it attaches to the purple plate. that should bring the pulleys up even with the 48t pulley. that would be better than squishing the bearing into the plastic trying to make them align.

if it ain't broke, break it.

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12-04-2005 04:13 AM  12 years agoPost 178
friz

rrNovice

Great Bend, KS

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I take it that cuda is having luck with his? Hey cuda how many packs have you run through yours and how many amps does it draw?

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12-04-2005 04:59 AM  12 years agoPost 179
cudaboy_71

rrElite Veteran

sacramento, ca, u.s.

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i dunno...i lose count. maybe 10 full packs (many more test flights...lotsa tinkering) through mine. i've been working with rcracer all through prototyping. there were some early issues that i believe got resolved. but, never anything to do with belt alignment.

dunno how many amps its pulling though. never measured it

i can say that my setup (until tonight) has been an 18amp eflite esc on a himaxx 4100-2015 w/ 4 HS-55s, GY401; kokam 1500 3s 8C; AUW 485g. this is a .71" stretched boom. but, i've been running hornet (narrow chord) 255s. havent smoked anything yet.

climbout has never been stellar with the himaxx. i just installed the 400DF/15t w/ SAB 280s tonight...weather permitting i'll play with that tomorrow.

if it ain't broke, break it.

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12-04-2005 05:12 AM  12 years agoPost 180
cudaboy_71

rrElite Veteran

sacramento, ca, u.s.

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zoom;

i used the same #2 washers i used for your tail slop mod. that's what i originally used in prototyping to take up the space. i'm still using them. rcracer probably just sourced them from mcmaster in a larger lot for the retail kits.

if it ain't broke, break it.

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 15 pages [ <<    <     7      8     ( 9 )     10      11     NEXT    >> ] 25799 views
Helicopter
e-
Century Radikal E640 - Swift 16 NX
› 3D pro belt drive conversion plus..
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