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Helicopter
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Century Radikal E640 - Swift 16 NX
› 3D pro belt drive conversion plus..
09-30-2005 09:52 PM  12 years agoPost 1
rerazor

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Mich.

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Well I thought I would start a new thread, the old one was getting a little long and full.

I have the new rc-helitech.com (from RcRacer) belt conversion protoype kit. It is a very simple plug and play kit and should help the 3D pro to get more popular again.

Since we are still in the testing stages the correct length belt was uncertain. RcRacer should have this all but figured out now. I'm currently using a longer belt and a longer boom (arrow shaft same dia. as the stock boom). I figured since i have the extended boom i might as well try some 305mm trex blades ($10). I burnt up the 2015-4100 running the stock century blades. So i started to try differant "400" size motors that I had laying around. The first was a 2025-2700 himax on a 11t pinion. This was a very nice gentle sport flyer and everything ran very cool. I had to ditch my Tp 1320 that finally wore out for my equally as old Tp Gen II 2100. This morning I tried my mega 16/15/3 and all I can say is WOW!!! This heli has ballistic climbout with no bogging at all. Everything runs very cool as it should since the AUW is 540g (same weight as my trex without battery or canopy.

I have a tp 2100 pro lites on order and a 400DH to try next week. I will get a 1320 pack again but the 3s 2100 pro lite I can use in the trex as well for the time being.

The tail showed no signs of any wag and held perfectly on the full climbouts I threw at it and I did a lot of climbouts because i just couldn't get over the climbout.

My high speed internet is out right now so i will post more later. I'll upload photos on Monday.

Good thngs to come for the 3D pro!!!!

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09-30-2005 11:27 PM  12 years agoPost 2
copperclad

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NY

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hi
it sounds great! , looking forward to pictures monday , he aught to think about an extended boom model too , my guess is you are gonna like the 400dh , thanks for posting

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09-30-2005 11:37 PM  12 years agoPost 3
rerazor

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Mich.

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What pinion on the 400dh? i think from searching the 10t is the ticket? i was reading and thinking the 400DF might have been better, oh well??

Oh I'm sure he will have an extended version. It is nothing more than a longer belt and a boom.

Dial up is killing me..

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10-01-2005 02:41 AM  12 years agoPost 4
RCRacerrrNovice - Denver - My Posts: All  Forum  Topic

Did some testing with a more complete system, it fly's very well and I can't believe how quite it runs.

On my second battery pack I put the tail box to the test, I tangled with the kids swing set - Pilot error. The tail blade is gone, I also broke the tail fin, no damage to the tail box. Just replaced the tail blades and few again.

As I am a novice pilot the belt drive is much more durable, It just keeps going.

I will be offering a standard conversion kit that will include the boom mount, the front pulley ready to put on, the tail box, rear pulley and a 380 tooth belt. The kit will include all the parts required and use most of the stock HB parts. It is also reversable, if you find the belt drive is not for you, then all the stock parts will go right back on - no mods required.

Second I will offer an extended boom version of the kit, in addition parts will be available individually for you to create your own version.

In regards to the extended boom version, how much longer than stock would be wanted?

Must fiddle with everything!

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10-01-2005 02:57 AM  12 years agoPost 5
Hoverup

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Golden Gulf Coast - USA

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Put me on the list, I want one. This may be the only thing that keeps me from unloading my 3D Pro's. I am so tired of tearing things down to replace the T/R drive spur gear after every minor incident.

Cheers - Boyd
AMA 80393
IRCHA 3355
LSF 853
Major USAF
Retired

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10-01-2005 11:53 AM  12 years agoPost 6
geeo

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Edinburgh, Scotland

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Ditto to what Boyd says.
I'd take one too, might save my Pro from being a shelf hog.

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10-01-2005 01:29 PM  12 years agoPost 7
copperclad

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NY

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hi RCRacer
good work on the kit! , i was thinking an extended boom like rerazor has , long enough to run 305 main blades , i know there are 335mm mains available too , can the mains be too long

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10-01-2005 01:37 PM  12 years agoPost 8
rerazor

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Mich.

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CC,

If you have the motor the bigger the mains the better. I will try the 335mm when my 400DF w/ 15t and TP 3s 2100 pro lites come next week. 305mm, 315mm, 335mm are ready for testing .

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10-01-2005 04:21 PM  12 years agoPost 9
copperclad

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NY

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hi
sounds great

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10-01-2005 04:59 PM  12 years agoPost 10
aercam

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West Tennessee

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Hi ReRazor,

As you get to the longer mains, shouldn't you start thiking about a bigger diameter main shaft? I would hate to think what the forces being generated on that puny 3mm main shaft are approaching.

PJ

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10-01-2005 06:56 PM  12 years agoPost 11
rerazor

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Mich.

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I agree but thats all we have to work with so I guess we will see how strong it is.

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10-02-2005 12:26 AM  12 years agoPost 12
johnny b

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Central Coast, CA

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Interesting idea.

Any chance this could be made to fit on the Hornet 2?

I think a belt on this size of micro is what has been missing from the equation for a long time. With brushless and lipo, the power loss is not so essential because they're all overpowered on small brushless and 3s1320 packs anyways.

What the market needs is a way to get away from driveshaft tails since belts mean so much less maintenance problems and down time.

H2's and Pro's are selling very reasonable used because of the difficulty and expense of parts. This could bring many back to life.

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10-02-2005 12:31 AM  12 years agoPost 13
RCRacer

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Denver

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I don't have a hornet II, later as my other projects go to market I will look into it. The more information you can provide the better.

Must fiddle with everything!

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10-02-2005 05:33 AM  12 years agoPost 14
cudaboy_71

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sacramento, ca, u.s.

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hello all.

been in vegas all week. but, i got back to a desk full of parts from rcracer and spent the evening installing everything and taking notes.

everyone who wants a belt drive for the 3dpro should be VERY excited. i havent spun the thing up yet. but, installation is very clean and simple.

as far as the front end goes, the 48T pulley gear he sent me was pre-modded to fit right on the stock shaft and accept the shaft pin to lock it in place. the boom mount mated right up to the center, recessed section of the purple anodized top plate to keep it from twisting. in the prototype i needed to tap a thread or two of the 2mm screw holes, then the 2mm screws finished tapping themselves as they are driven in. i believe rcracer will address this issue by pretapping the first thread on the production model (tapping the entire hole 2mm provides a loose fit for the screw..it really needs to self tap)

there is no boom 'lock' as the stock version has to keep the boom from twisting in the mount. but, he did pre-drill and tap the setscrew holes. and, the appear to be holding very well.

on the back, the CNC tailbox and 10T alum. pulley went together super simply. the shaft bearings from the stock tailbox are re-used and pressed right into his setup. the 4 capscrews that secure the tailbox to the boom provide a very tight grip that can be moved only with great force. how that will work in flight will be seen tomorrow. but, it appears quite sufficient.

using a 388t belt, i had to adjust the boom in the front boom mount to get the tension right. i had to move the boom aft about 1/8" from its completely seated position. but, as i said above, the setscrews seem to be holding it well. i think once the 388t belt is confirmed to be the right belt for this setup, rcracer will adjust the depth of the boom mount accordingly.

as a side note, the skid mounts he has done are very nice. they went on in about 5 minutes. i will test them tomorrow. but, if they hold up to some rough landings in the street, i'll be giving them my o.k.

oh, last thing. i forgot to measure how much this mod extended the boom from stock. but, i held up my SAB 280s and they look like they'll fit now. i tried them on the stock version with my fingers crossed. but, they were too long.

pictures and hopefully video tomorrow.

if it ain't broke, break it.

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10-02-2005 05:40 AM  12 years agoPost 15
MidStar40

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Sioux Falls, SD

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This is so cool....I can't wait!!!!!!

Any ballpark ideas on cost for this conversion yet?? I know you're busy testing but I want to get my money in the mail!

Rod

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10-02-2005 09:15 AM  12 years agoPost 16
gorn

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Western Australia

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RC Racer, firstly , thankyou for actually getting this kit going for all us Pro flyers.......and me as the crasher
Re Razor and Cuda, thanks for doing the testing for us all.
Very exciting times ahead for this much maligned bird. Nothing wrong with it at all except for the weak tail and skids.
Rc Racer, I would think that the 2 most popular extended boom lengths would be the same as the Shogun for 280mm blades and the stock T-Rex blades, seeing as most aftermarket carbon blades are available in these sizes.
As fas I know both MAH and SAB do blades for these sizes, which in turn makes it very very easy to get a high quality setup.
I would HIGHLY recommend that anyone doing an extended boom conversion use Easton arrow shafts in the highest grade available.
I am an Archer as well, and I can tell you now that they are next to bomb proof when it comes to strength and straightness. I have tried many other brands, but only Easton keep getting my money.........they keep getting my money because I hunt as well, and after a while you lose shafts lol.
Different annodised colors available as well. Camo anyone? heh heh.

For the love of the hobby

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10-02-2005 10:55 AM  12 years agoPost 17
twinsticks

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South Jersey

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Put on the list also please.

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10-02-2005 02:51 PM  12 years agoPost 18
rerazor

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Mich.

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Arrow shaft is exactly what I use for my current extended boom.

Cuda,

Wait until you fly it and you see how smooth it is. You will wonder why the belt drive was not used in the first place . a video would be cool!!!!

I think the final belt length wil be 380t so the stock boom and everything wil fit. I also think (RcRacer will chime in) that the frame mount will be redesigned a little with more of a shelf for the gyro and better area for the set screws to bite into.

The landing gear is also in the redesign stage to get rid of the giraffe look and give it a wider/lower stance. I think the landing gear won't break, it might bend but thats about it.

This conversion kit will bring more to the 3D pro and keep the curent owners from "dumping" them.

Next we need to work on a better front mount so mounting electronics isn't a bunch of "stacked" mess.

Century (and RR) should be happy that we have fixed the weak links in the 3D pro and will increase sales in kits and parts.

I totally agree on getting the size so the popular CF blades will work. The 305mm Trex woodies are not actually 305mm. For some reason Align over states the length (i.e 335mm are actually 320mm).

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10-02-2005 03:04 PM  12 years agoPost 19
upperking

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Spring Hill, Florida

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You think century would be doing something about the tail by either giving a new kit option with the belt drive or 3dpo v.2 with belt drive...

I wonder if they are stuck with all their money into the gear drive version and are selling them out to the end and deiced it wasn’t cost effective to make a belt drive update...
I only see them selling mostly to the first time buyers for the gear drive...
And maybe they will phase the 3dpro out and but all their eggs in the basket for the swift...

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10-02-2005 03:04 PM  12 years agoPost 20
rerazor

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Mich.

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Jonny- B,

Here is your Hornet Belt conversion

http://www.rcgroups.com/forums/showthread.php?t=416810

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