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HomeAircraftHelicopterMain Discussion › Old Fixed Pitch Indoor Helli -Century Hummingbird Question
09-09-2017 12:33 PM  11 months agoPost 1
MattJen

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UK

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Hi All
I'm sure we all remember this helli from the early 2000, I managed to get hold of one on Ebay, it still has the NIMH bird Seed battery which is not holding charge.

I remember us using Lypos in the day as they were better, but I cant remember what cell count we used, the original NIMH was 7 cell, 7 x 1.2V 8.4V so what would the equivalent Lypo ? I tried a 2 cell 7.2v, I guess a 3 cell would be too powerful..

It is funny on the 35 meg, it sometimes does its own thing amazing how technology has moved on.

Matt

All The Best

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09-09-2017 10:38 PM  11 months agoPost 2
InvertedDude

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USA

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MattJen
Don't see why a 2 cell lipo would work? Just watch the time and keep track of MAH used before needing recharge.

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09-10-2017 12:34 AM  11 months agoPost 3
oldfart

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Vancouver, Canada

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I tried a 2 cell 7.2v, I guess a 3 cell would be too powerful..
How did you find it with the 2S? What was the mah and C rating of the battery you tried?

I still fly my original one with some 8.4V and 9.6V "Birdseed" packs that I have managed to revive.

Phil

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09-10-2017 12:51 PM  11 months agoPost 4
coolice

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Northamptonshire, England

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Hey buddy.

Brilliant, these were such fun in the day.

From memory I think we used 1000 - 1500mah 2s LiPo's. At the time the C ratings weren't very high and this model doesn't really need too a high a rating, so 20C and above should work great.

We need flying videos please :-)

Ian

Ian Contessa
Team Robbe SchluterUK
Midland Helicopters

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09-10-2017 03:13 PM  11 months agoPost 5
GyroFreak

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Orlando Florida ...28N 81W

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How did a fixed pitch tilt to move and control ??
Close up of the flybar linkage area please, and a video of your flying this artifact from the past.

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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09-10-2017 03:50 PM  11 months agoPost 6
JuanRodriguez

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The Villages, Florida

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Still via a swashplate, I believe ....

Been there, done that and old enough to know better.....

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09-10-2017 05:59 PM  11 months agoPost 7
MattJen

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UK

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thanks for the help guys,
Coolice,Old fart, Juan, good to hear from you, lypos ordered, and yes I will do a video, I started it up in shed the old thing on 35meg was twitching all over the place LOL..

Just holding it in my hand the tail started up (Separate motor) certainly bought back memories, I will be at my indoor flying next week ( Friday) so will have ample space to test it.

Matt

All The Best

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09-10-2017 06:59 PM  11 months agoPost 8
dkshema

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Cedar Rapids, IA

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Typical fixed-pitch heli control as seen in a GMP Cricket.

Single pushrod from swashplate to flybar.

This changes the plane in which the flybar tracks or flies. The rotor head tilts with the flybar, giving one blade more pitch, one blade less. This is what makes the heli controllable, not that much different than a collective flybarred or FBL heli.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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09-10-2017 07:22 PM  11 months agoPost 9
GyroFreak

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Orlando Florida ...28N 81W

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Thanks Dave, so I am assuming there are two servos to control the swash plate ?

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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09-10-2017 11:37 PM  11 months agoPost 10
MattJen

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UK

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here is the diagram..

Only sad thing is spares are hard to come by now, managed to get some from Midland helicopters, but would like to get a horizontal fin ( could cut my own ) and a new canopy.

All The Best

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09-11-2017 02:24 AM  11 months agoPost 11
dkshema

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Cedar Rapids, IA

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Yes. Two servos. Fore/Aft cyclic and Left/Right cyclic. This cyclic control, complete with flybar was the system used by the Hiller helicopter design.

No need for a third collective pitch servo. Lift is a function of motor RPM

Without the direct swash to blade pitch control from the Bell Helicopter system, control response has a noticeable lag from your thumb command input to c9ntr9l response.

Similarly, there is a lag between throttle changes and lift response.

Dieter Schluter combined the flybar style control from the Hiller system with that of the direct swash to blade control from the Bell system, and patented the result, calling it the "Beller system."

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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09-11-2017 06:40 PM  11 months agoPost 12
oldfart

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Vancouver, Canada

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Matt, send me an e-mail to: orders@leisuretech.ca as we still have a some Hummingbird parts including canopies and even some scale fuselages.

Here is a video of mine that we made a number of years ago:

Watch at YouTube

Phil

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09-12-2017 11:06 AM  11 months agoPost 13
MattJen

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UK

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ha ha love the video, brought back some memories.
Will PM Over Email..

Matt

All The Best

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09-13-2017 10:43 AM  11 months agoPost 14
Richardmid1

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Leeds, England

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That's a proper helicopter! I've had similar (Venom Night Ranger and JP Twister). I used to use a 2s 1200mah pack and could get 20 minute flights!! Miss those days!

I did also use a 3s pack but there isn't any need for the extra power on such a heli and you loose flight time.

FWIW that works out as an average current draw of only 2.88A so actually any discharge rating above like 5C would work fine!

60% of the time, it works every time!

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09-25-2017 03:39 AM  10 months agoPost 15
jschenck

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La Vista, NE.

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use a 2 cell lipo that weighs about the same as the original NiMH so the CG is correct. FP heli's really need to be properly balanced.

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09-25-2017 11:35 AM  10 months agoPost 16
Richardmid1

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Leeds, England

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I just used to tie mine on further forward with a rubber band or reusable zip tie.

60% of the time, it works every time!

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