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Century Radikal E640 - Swift 16 NX
› 3D Pro belt-drive mod
10-14-2005 03:30 PM  12 years agoPost 201
RMSLINKERS

rrApprentice

Audubon, Minnesota

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I'll test one out. Are these in kit form are they together?. Looks like an out-runner could be mounted top or bottom without a problem. When do you expect to import them for testing?.

If it isn't beating the air up it isn't flying

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10-17-2005 10:15 PM  12 years agoPost 202
zoom

rrElite Veteran

Galveston, Texas

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wheres Zoom when I need him?
I'm still around. I have apologize for been missing in action due to heavy school work. I just happened to peek in on things to see what's been going on. I'm amazed at what you guys are doing with the Pro. I refrain from saying anything like, "Century should take a page out of our (the pilots who come up with the latest mods) book," because they probably will. I know Century has reproduced an idea or two with hummers in the past. It all good, as long as the pilots are happy.

Rerazor, as far as the battery / motor combo, I'm in favor of the 400F with 20T, or DF w/ 15T as far as the motor. I just have not been able to find a lighter, cheaper motor that can produce the power.

If the new heli with all of the mods and belt drive kits will start to approach the weight a T-Rex, then the next step up motor would be 450TH (3000kv) with 13-14T pinion, or the 450F (3450kv). There run about $55-60 @ JGF. I have not had the chance to buy the 450F, but I did see video of it doing pretty well in a Trex. The reason the 450TH is needed if the weight increases too much is that I experimented with the 400DF in my Trex swinging the 305mm stock blades, and I could tell the motor's limit may be around 272-280mm blades. Those 305s put a serious load on the 400DF. So, the weight of the heli becomes crucial in terms of which motor to run.

I run the 20C Kokam packs. In my Trex, I have 2 -740mah pack bridged in parallel to give me a 3s2p 1480mah the pack weighs 129g and capable of a sustained ~29amp draws and 44amp bursts.

The gen2 TP 1320 will do sustained ~18amp draws, which is fine for most purposes, but you will notice the difference between the Kokam and TP. The Kokam kicks much behind .

What type of weight range are we talking about here?

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

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10-17-2005 10:18 PM  12 years agoPost 203
upperking

rrApprentice

Spring Hill, Florida

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can the stock canopie fit on this?

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10-17-2005 10:18 PM  12 years agoPost 204
upperking

rrApprentice

Spring Hill, Florida

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can the stock canopie fit on this?

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10-19-2005 08:20 AM  12 years agoPost 205
FreshAir

rrNovice

NW-Germany

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Under construction !

Reduction: 4,5:1 for high speed tail rotor
CCPM Servoholder, 90° Fp also possible, simple to change servoholder
370 size

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10-19-2005 09:30 AM  12 years agoPost 206
garage_flyer

rrKey Veteran

Elk Grove, CA (Sacramento area) U.S.

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Man, How many Prototype birds are out there?

The next 6 months we would be flooded by way too many choices. This is going to be way too much fun.

3D Pro? I have only "1D" under my belt, what am I going to do with "3D"?

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10-19-2005 01:29 PM  12 years agoPost 207
zoom

rrElite Veteran

Galveston, Texas

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Ahh, this is getting good, because the topic (belted tails) applies to all Hummers. Competition is good. It pushes everyone to do their best and hopefully keep the prices down.

The only ? I have of Fresh Air's design is where the the motor mounts?

On top it seems the motor's shaft will not be long enough.

On bottom, it seems that the motor might interfere with batter mount and keep CG balance.

But I do like the idea. Keep them coming guys. Fresh Air has the lead on the FP Belt.

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

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10-19-2005 05:30 PM  12 years agoPost 208
zoom

rrElite Veteran

Galveston, Texas

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RCRacer, I applaud your efforts as well. Your belt adapter, and tail housing design appears to be most practical in convertng the current bird over without creating a huge weigh gain. Plus it appears to extend the tail distance utilizing stock parts to where you can at least run 280mm blades. That is my personal goal. These blades are readily available for purchase and I could even make some ruler blades for my bird if need be.

Sign me up too for the conversion new kit.

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

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10-19-2005 06:26 PM  12 years agoPost 209
FreshAir

rrNovice

NW-Germany

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@zoom
Thanks! On the red frame, i called it "MH-B X-Pro", the motor can mount on top or buttom side. But i will do some change in the design, the head more down and so on.


Today i made some test flights with my belt drived Hummer. The tail is extrem stable with GY401. The sound in flight is amazing, too much headspeed. I think i must bling the head.

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10-27-2005 11:12 AM  12 years agoPost 210
FreshAir

rrNovice

NW-Germany

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This is, when the Swashplate are 2 parts (happend in flight with 3000 rpm headspeed) I am lucky, blades are ok. I think, now it's time to change swashplate

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10-27-2005 02:39 PM  12 years agoPost 211
zoom

rrElite Veteran

Galveston, Texas

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That mainshaft is doing the "Gangsta lean"

Hope you get it back up and running soon.

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

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10-27-2005 07:50 PM  12 years agoPost 212
CRB68

rrApprentice

Tombstone, AZ

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Hey FreshAir.

Your frame looks very good.

Hey Zoom

"Your belt adapter, and tail housing design appears to be most practical in convertng the current bird over without creating a huge weigh gain."

With my frame set, the weight matches the 3D Pro almost exactly. I found a 1 gram, yes, 1 gram weight difference with my frame compared to a stock 3D pro. This I attribute to careful consideration of stresses and force distribution and having material in the places that need it and using triangulation and box structure design to achieve rigidity without adding weight.

With the Shogun 272 blades it is a real sweetheart and the tail holds like an alligator on a duck.

Did I mention that is has proven to be virtually indestructable in crash testing so far? Hey freshair, I see your frame survives very well also.

Sorry about having taken a little trip off the path. Now nack to Freshair's post.

PJ

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10-27-2005 08:17 PM  12 years agoPost 213
Hoverdown3K

rrKey Veteran

Rochester, New York

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Just waiting for something to come to market, there are a bunch of people doing belt mods, I knew the 3D pro needed one from the start.

I wish something would come to market soon as my Pro is just sitting there waiting.

-= I know there is Money in RC helicopters. I put it there=-

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10-27-2005 08:20 PM  12 years agoPost 214
zoom

rrElite Veteran

Galveston, Texas

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CRB68

Good point. Keeping the weight the same really is important. This is the very reason, people choose to seek longer rotor blades for more lift. The current 3D Pro's design did not take into account enough for the weight gain from bigger electronics, motor, etc.

I can't wait to see all of these new mods come to market and get in the air. There has never been a better time for the Hummer. Century should employ you all.

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

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10-27-2005 10:30 PM  12 years agoPost 215
CRB68

rrApprentice

Tombstone, AZ

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Hi Zoom,

Thanks for the kind words. However, I don't think I would fit into Century's work force.

When you combine the light weight of the airframe and the longer blades, the pitch curve had to be changed so the motor remains under relatively light load. I do not fly 3D (B.A.R.F---Beserk And Radical Flying---) so for sport flying and F3C type of flight my flight times went up, battery usage went down, both Temps dropped and my little 2015-4100 on 10T just hums along. In fact, on the belt drive prototype that and the blade noise is all you hear in flight.

I am taking a video and will take you up on your offer to have me send it to you and you can see about having it posted. Really, there are places here in the SouthWest that do not have DSL or Cable available and my piddly 44Kb on dialup restricts any video for me.

PJ

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10-27-2005 10:42 PM  12 years agoPost 216
zoom

rrElite Veteran

Galveston, Texas

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Man, no DSL/CABLE The only other option I can see is satellite service. But just send me a PM when you are ready to get it posted up.

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

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10-27-2005 11:18 PM  12 years agoPost 217
CRB68

rrApprentice

Tombstone, AZ

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Hi Zoom,

Yup. Sure sucks being on old analog dial up. Satellite is the only way but the price of entry ($600.00 up front) is a bit much for the budget for now.

Will do and I hope to have my other half( ) doing the camera work in the morning.

Thanks again.

PJ

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10-31-2005 12:32 PM  12 years agoPost 218
FreshAir

rrNovice

NW-Germany

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Hi @ all !
Now i've got it !

This frame is spezial made for Hummingbird CP / 3D Pro. Weight is 121 Gramm just like on the picture. Main gear with auto rotations hub, main shaft is 3 times rested. More details soon!

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10-31-2005 02:13 PM  12 years agoPost 219
rerazor

rrElite Veteran

Mich.

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The belt kit is out at rc-helitech.com for $56.

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10-31-2005 03:15 PM  12 years agoPost 220
FreshAir

rrNovice

NW-Germany

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Hey, good to know where i can buy the main pulley. The pulley in my frame , is made by myself (hard job)

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Century Radikal E640 - Swift 16 NX
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