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05-07-2005 09:40 PM  12 years agoPost 1
QuantumPSI

rrElite Veteran

Atlanta, GA

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Just got done flying my Shogun for the first time and I must say that it is a very stable machine. Much more stable than my H2. Anywho... I'm using a Himax 4200 and a CC25. I only hovered for about 6-8 minutes and the motor is scorching hot. My throttle curve is from 0-100% linear and my pitch curve is from 50%-100%. I'm using an Etec 1200 lipo. Also, I'm using the belt drive for the tail.

Aside from the motor getting excessively hot, I love this little machine. I can let it get like 5 inches away from myself and not be afraid that it'll come at me. It actually hovers hands off. My H2 could never hover hands off this long. I have one concern tho, upon spool up, it shakes pretty bad and because of the thin landing gear, it is prone to tipping over. I attached one dowel, like training gear, to prevent this. Anyway to stop this problem? I plan on getting some wider landing gear, what is everyone using? Thanks!

Mikel

...now where was I, dh/dt = BS-dx/dt
I will fly you forever... till earth do us part

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05-07-2005 09:49 PM  12 years agoPost 2
wings

rrApprentice

Stafford, UK

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you can get wider landing gear direct from protech (distributers) in the UK, got them on my zoom and work great. I have seen other gear on US sellers websites that look good to, or you can heat up the bends on the stock gear and bend them out to widen the stance. A few have done that with success.

PS 5 inches is a little close, these birds are known for glitching, i would be carefull if i were you - at least untill you know you are glitch free.

PPS What pinion are you using, my himax used to get reall hot too on a 9t, switched to an 8t, its a more efficient setup - do a search, its a well discussed topic.

If this is your first post then welcome to the forum, there is a tonne of info here. Well worth trawling through. It has been a very valuable point of reference for me.

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05-07-2005 09:56 PM  12 years agoPost 3
QuantumPSI

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Atlanta, GA

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Well this is my first post in the zoom forum ! You're right, I was taking a risk, but I thought it WAS SO COOL! As for what pinion... I don't know ! I bought it built from Modefo so I'll have to get back to you on that one. Looks to be like 9t or 10t. I'm thinking about getting an airwolf body for it! I think that would be so cool, to 3D an Airwolf, that is when I learn to 3D!

Mikel

...now where was I, dh/dt = BS-dx/dt
I will fly you forever... till earth do us part

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05-07-2005 10:05 PM  12 years agoPost 4
wings

rrApprentice

Stafford, UK

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On a himax 2025 4200 with a CC25 you really want an 8t pinion, it reduces the headspeed to an efficient speed, remember drag is the square of velocity. running the ESC at approx 95% on an 8t yields a head speed of approx 2200 - 2300rpm, plenty enough for 3D. I have a similar power train as you and my motor is just luke warm after a 13 - 14 min flight, battery too. I do however use a flightpower 1600 lipo.

PS, these things never stop being cool!!

enjoi...

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05-07-2005 10:07 PM  12 years agoPost 5
QuantumPSI

rrElite Veteran

Atlanta, GA

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How is your CC25 programmed?

Mikel

...now where was I, dh/dt = BS-dx/dt
I will fly you forever... till earth do us part

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05-07-2005 10:39 PM  12 years agoPost 6
leslie

rrKey Veteran

Hollis, NH - USA

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Hi QuantumPSI,

Check rchover.com for wide gear, they're in foxboro, MA. Wicked great service

I'm running a geared tail with 2025-4200 himax and an 8 tooth pinion. I'm using 3cell TP1320's. My motor get warm, not burning, but certainly not scorching. What pinion are you running.

I have my cc35 programmed:
fixed mode
cutoff 6v (I'm running 3cell she lands well before I get here)
current limiting disabled.
everything else standard(default)

Cheers,
Leslie

Protecting those who protect us

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05-08-2005 12:17 AM  12 years agoPost 7
ericfly

rrApprentice

Cornwall, UK

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Glad you like your Shogun/Zoom, Quantum. I have flown with a Himax for some months but have always had a heat sink on it. It never gets more than warm.

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05-10-2005 06:23 AM  12 years agoPost 8
vinrx7

rrVeteran

Americas finest city

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shaking might be tracking or blade balance. It also could be the main shaft or spindle but if you have not had a tip over then it should be fine. The stock aluminum main shaft is weak. When it needs replacing, get the steel one. Enjoy the heli

STUPID TREE!!!

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05-10-2005 04:58 PM  12 years agoPost 9
QuantumPSI

rrElite Veteran

Atlanta, GA

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Ok, now I have a problem. I think it is the CC25. I can not tell when the battery is getting low since power seems to be consistent throughout the entire flight. Then out of no where, the motor cuts and it drops to the ground. It hasn't suffered any damage but I really can not tell when the power is getting low. What should I do guys? With my H2, it is quite clear when the power is getting low, but not with this thing.

Mikel

...now where was I, dh/dt = BS-dx/dt
I will fly you forever... till earth do us part

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05-10-2005 05:18 PM  12 years agoPost 10
RC-Hawk

rrApprentice

Westminster Colorado

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If you have Gov mode setup, you'll get almost consistant head speed throughout the battery, you'll need to bet a battery monitor, (or time your flights).

As far as the bird shaking when you spool up.
If it shakes for a bit until the head speed gets up and then smooths out. Then you shut down and (without touching the heli), spool it back up smooth, then the blades may be a bit tight. It will shake a bit initially until the blades center out.
If it always shakes on spool up, look for blade balance, or a bent shaft.

Hawk III 46 -- Raptor 30 -- Hummingbird Elite CP -- Shogun

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05-10-2005 06:02 PM  12 years agoPost 11
QuantumPSI

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Atlanta, GA

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That's the thing though, I'm not in governor mode. I'm in the auto-calibrating mode.

Mikel

...now where was I, dh/dt = BS-dx/dt
I will fly you forever... till earth do us part

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05-10-2005 06:12 PM  12 years agoPost 12
RC-Hawk

rrApprentice

Westminster Colorado

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The auto calibrating mode is for the number and type of batteries.
The gov mode has 3 settings -- "Fixed" , "Gov mode mow", and "Gov mode high".

Set the battery cutoff to something like 6 volts. You'll never get there cause the heli won't fly at much under 9.

Hawk III 46 -- Raptor 30 -- Hummingbird Elite CP -- Shogun

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05-10-2005 09:35 PM  12 years agoPost 13
TomC

rrKey Veteran

Gold Coast, Queensland, Australia

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I use the 'fixed' throttle setting (with throttle curves) with my cc35. I find that the throttle response is better (more linear).

Like RC-Hawk, I set the voltage cutoff to 6v. Also, I use a simple radio shack countdown timer and try to land about 1 minute before the battery power starts to go low. This end up using about 70-80% battery capacity and I believe it helps prolong the life of your lipo's.

Cheers,
TomC

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05-11-2005 12:26 PM  12 years agoPost 14
copperclad

rrElite Veteran

NY

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hi
it's a good idea to run a heatsink , peel the lables off the motor and use heatsink compound from radio shack , your himaxx will like it

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05-11-2005 07:28 PM  12 years agoPost 15
wings

rrApprentice

Stafford, UK

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agreed. heatsink can only do good things!!

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05-12-2005 03:38 AM  12 years agoPost 16
vinrx7

rrVeteran

Americas finest city

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auto calibrating is not for helis! Use either fixed throttle or gov mode.
your problem is that you have your CUT OFF VOLT set too high. if its at 9V then you need to lower it to around 4-6 volts. Also make sure you have your current limiting to INSENSITIVE. This will solve your problem.

STUPID TREE!!!

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05-12-2005 03:53 AM  12 years agoPost 17
QuantumPSI

rrElite Veteran

Atlanta, GA

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I'm just curious but why is the "auto calibrating" mode bad for helicopters?

Mikel

...now where was I, dh/dt = BS-dx/dt
I will fly you forever... till earth do us part

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05-12-2005 04:53 AM  12 years agoPost 18
TomC

rrKey Veteran

Gold Coast, Queensland, Australia

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The way I understand the 'auto-calibrating' mode after talking to a number of esc manufacturers/suppliers is that the auto-cal mode results in a bit of negative exponential to the bottom half of your throttle stick movement. That is, it ramps up your initial throttle stick movements a bit.

This is great for planes since you do not need to use as much of your bottom half for taxi and take-off's. But, for heli's, using throttle curves, it is better to have a more linear throttle response throughout your total throttle stick movement. This is what 'fixed' mode is supposed to do.

This is the theory, but in practise, I cannot really tell the difference between these 2 modes with all my cc escs (brushed and brushless!

Cheers,

Tom C

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