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e-Century Hummingbird - Swift > 3D pro belt drive conversion plus..

Mike Wilson
Veteran
Location: Toronto, Canada

I just installed mine today and I am very happy with it. It installed without any issues and the heli is much smoother now.

.....led

Team Avant
Flightpower
V-blades
Aerospire
Spektrum
Teambob00

01-14-2006 Over year old.

geeo
Senior Heliman
Location: Edinburgh, Scotland

I too want to add my praises, the belt kit is so smooth it's actually fun to fly it now, 3d pro sucks without it

01-14-2006 Over year old.

rerazor
Elite Veteran
Location: Mich.

I still don't understand what Century was thinking when they first designed the 3D pro.

Nice job Rcracer!!!!!!!!!

01-14-2006 Over year old.

geeo
Senior Heliman
Location: Edinburgh, Scotland

Maybe if there designers were as proficient as there marketing we would have what we needed from the start

.
I was suckered in by the hype of it before it was released, best 3d micro machine/ nice size no upgrades needed LOL, mines was a vibe monster straight out of the box, best thing it did was shake itself into the ground, got a lot better after the metal blade grips/flybar cage upgrade and some real blades but the tail was just a constant grief, i get a heli mag called rotorworld and they had a review of it where the guy said the tail was a work of art

, made me want to rip the mag up.
I even bought 3 hs 56 for it at last years 3dmasters but i couldn't bare to waste them by putting them in it, after todays little flight there deffo going in.
So now about 7 months on im getting close to what i thought i bought.

01-14-2006 Over year old.

friz
Heliman
Location: Great Bend, KS

I have yet to read an honest reveiw of a product in a mag. Their first responcibility seems to be to their advertisers and not to their readers. IMO mags are a waste of money for anyone needing accurate information.

01-14-2006 Over year old.

timb_171
Heliman
Location: Norwich UK

Direction of tail rotation?

Mine Arrived yeterday - I've got it half installed, just waiting on some other parts (new boom/tail shaft)

The quality of the kit is excellent, and it was easy to install (unlike removing the bearing from the boom and the MH tailbox! which was a nightmare for the tailbox and completley impossible for the boom)

Anyway, I'm very pleased - it was worth the wait and I'm looking forward to getting it in the air.

One question I have, On the instruction sheet (and excellent the sheet is too) there's a small note about the direction of rotation of the tail rotor - either up, into the wash or down, with the wash. I was wondering what effect changing this has on the helis performance?

Regards,
Tim.

01-14-2006 Over year old.

cudaboy_71
Elite Veteran
Location: sacramento, ca, u.s.

i made the manual...so, thanks for the compliment.

the reason i put the note about the reversal of the rotor direction is that is how just about every other model is designed...up into the wash.

why? well, i'm no engineer but i believe it has to do with optimizing lift (of the tail rotor). if you think about it, one half of the blade will be in the wash...no way around it. so, do you want it to have the wash hitting the leading edge of the rotor, providing additional 'bite' or do you want it hitting the trailing edge reducing lift? seems to me we need all the 'tail' we can get (pun intended

)

if i'm off on this i'm sure someone will correct me.

it's the builder's choice, though. and, this kit provides a means to at least easily choose.

if it ain't broke…break it.

01-14-2006 Over year old.

HOMEPAGE

zoom
Elite Veteran
Location: Galveston, Texas

Rotor wash of the leading edge on the tail blade with the original Pro's tail depends on whether you are upright or inverted. With the geared tail, the tail blades rotate directly into the wash when inverted. The thing about belt systems is that you can change the tail's rotational direction with a simple twist of the belt and flipping the blades in the tail's grip. I have not read any reports of a difference in performance or flight characteristics with either direction the tail was spinning (wash, or no wash).

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

01-16-2006 Over year old.

cudaboy_71
Elite Veteran
Location: sacramento, ca, u.s.

that brings up an interesting point. i'd always thought of the downwash as the force created by the air coming off the blades. but, i'm hard pressed to find a definition of downwash anywhere that makes that distinction (as opposed to the force created by the air drawn into the blades).

if downwash is only the force coming off of the blades, then inverted flight downwash would still be toward the ground--no downwash onto the airframe/tailrotor.

it's and interesting question because i'd never thought of it that way, and i'm wondering if the force created above the disk is any different than the force below it...perhaps allowing air to be pulled into the disk in a non-linear direction maybe???

points taken though. this is purely theoretical and informational for me; i'm not a good enough pilot to tell the difference between the two setups (if in fact anyone can).

if it ain't broke…break it.

01-16-2006 Over year old.

HOMEPAGE

garage_flyer
Key Veteran
Location: Elk Grove, CA (Sacramento area) U.S.

If you do that, do you need to switch to Rev. on your Gyro?

01-17-2006 Over year old.

cudaboy_71
Elite Veteran
Location: sacramento, ca, u.s.

you know, i dont remember. i know that threw the pitch slider out of alignment; i had to readjust the position of the servo to get the throws back in line. so, flipping the rev. switch was the least of my worries

if it ain't broke…break it.

01-17-2006 Over year old.

HOMEPAGE

timb_171
Heliman
Location: Norwich UK

Oops! Broke it.

Finally got the heli rebuilt and took it out for a test flight.

The tail tracked well, was smooth and noticably quieter than the shaft drive.

The heli only managed to get 2.5 - 3 feet off the ground though, dunno if I need more pitch or more throttle, or both? I guess it was sitting on the Ground Effect? I'm running the stock inrunner with a quark 22 at about 90% though.
Anyway it started to get a bit wobbly (cross wind) and looked like it was gonna crash, so I did a reletivly "controlled" ditch into the grass on the lawn. The tail rotor became caught on the grass as the autorotation of the main rotor slowed down.

On inspection I discovered that the tail pulley had split across the "collar" at 90 degrees to the set screw (the toothed area is not affected).
I guess the shaft had stopped, but the pulley continued to spin with the belt/head - this forced the set screw out of it's recess and caused the split?

The belt was tight, but still had a little play in it and the set screw was tight, but not to the point it was deforming the plastic. Once the CA's dried, I'll try running it with a looser belt (and more picth).

This is NOT a complaint in anyway - I love the belt conversion (I didn't mention the 3 or 4 times i clipped the tail before this, which previously would have resulted in a new crown gear each time!)

Sorry about the long post. Just thought all concerned would like the feedback.

Regards,
Tim.

01-18-2006 Over year old.

gorn
Elite Veteran
Location: Western Australia

RCRacer, could you please let me know how far off the wide landing gear is from being ready for sale?
Im dying to buy the belt kit, but want to get both at the same time, naturally saves on international freight.
Cheers

If you bling it, they will come :D

01-18-2006 Over year old.

RCRacer
Heliman
Location: Denver

I have it drawn up, we need to create a fixture to hold it in the machine and make a few trial versions. It's about 1.5" wider and thicker than my stock version, I could not got much wider and still keep the yield up from the materials (Cost)
Now I am just waiting for the machine to free up long enough to make the prototypes and the fixture.

I keep saying in a week or two - a few months ago. It's real close !

Ron

Must fiddle with everything!

01-19-2006 Over year old.

friz
Heliman
Location: Great Bend, KS

The helitech standard gear is very good. It is wider then the stock gear and very durable.

01-19-2006 Over year old.

gorn
Elite Veteran
Location: Western Australia

Thanks Friz
Im going to order the gear he's selling now, cos Im impatient lol.
Cheers

If you bling it, they will come :D

01-19-2006 Over year old.

timb_171
Heliman
Location: Norwich UK

An update on my broken tail pulley

I've been to my LHS, but the only thing they had which was close, was a small pulley fitted to a splined tail shaft from a TRex. The shaft is the same size as the 3d Pro.

I made a small indent with my dremmel for the tail rotor set screw and also a small spacer.

I've just tried a test flight, and it seemed to work ok - couldn't properly test it 'cause it's dark.

I've also ordered an 8t cnc alloy pulley for a zoom off ebay. It has a collar at both sides, but I can always trim it to fit

regards
Tim.

01-19-2006 Over year old.

CRB68
Senior Heliman
Location: Tombstone, AZ

Hey Timb

You need to be careful with what you put on the tail. The Trex is an 11T pulley and will reduce your TR ratio to 1:4.36 from the 1:4.8. If you use the CNC pulley, your ratio will be 1:6. This may well be in the zone where your TR will explode. This RPM would be 12,600 RPM with the main rotor turning 2100. At 2400RPM the TR is turning 14,400 and you can really hear the buzzing. With the 3D Pro 2100 RPM is at the low end of the scale and 2400 more common. The stock HeliTech pulley is a 10T I believe. Whatever you use, make sure your TR blades are BALANCED!!!

PJ

01-19-2006 Over year old.

RCRacer
Heliman
Location: Denver

Tim,

I have looked at a 9 tooth pulley, if this is used you need to reduce the main pulley to a 44 tooth. Let me know I can make one up if needed.

You can also use a 10 tooth Aluminum pulley, they all come with a 1/8" shaft hole. This is pretty close to the 3mm size and seems to work fine. It will need to be turned down to a smaller diameter. I plan to offer the alum tail pulley in the future and could make one up if that is the way you want to go. McMaster Carr has the alum pulley, again it will need to be turned down.

Ron

Must fiddle with everything!

01-20-2006 Over year old.

upperking
Senior Heliman
Location: Spring Hill, Florida

I used the gearbox from microheli.com and used a metal pulley for the belt gear.. works great..!

01-20-2006 Over year old.

HOMEPAGE

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e-Century Hummingbird - Swift > 3D pro belt drive conversion plus..

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