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help:slow stick prop size

Old 06-27-2008, 02:48 PM
  #1  
raad
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Build Review help:slow stick prop size

Hello all ,,
i want to buy this prop and gearbox for a slow stick setup , and wanted some expert advise b4 i do so.

GWS EPS-400C Gearbox w/Pinion 3.00:1
http://www3.towerhobbies.com/cgi-bin...?&I=LXHUV9&P=0

or
Great Planes ElectriFly Gearbox T400 3:1 Ratio BB
http://www3.towerhobbies.com/cgi-bin...?&I=LXAGC8&P=0


any of these two with a ( 11*7 prop )..

on..
*11.1V 1800mah battery
*400F 2250KV brushless outrunner
* CC ThunderBird18
electronics weight ~215 grams

From justgofly.com the 400F with the 3:1 gearbox and the 11*7prop will give a 26.4 Oz of thrust and pull 132Watt ,12.0Amp

can anyone one comment on this please ?

Thank you
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Old 06-27-2008, 06:30 PM
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John Canfield
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Why a geared motor?
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Old 06-27-2008, 09:33 PM
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raad
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because direct drive does not give enough thrust , and the motor is too fast for the SS.. i think its necessary to have a gearbox for large propellers
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Old 06-27-2008, 10:20 PM
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John Canfield
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Default Gear box - not for me!

The last time I used a geared motor was with my first Slow Stick a couple of years ago - that's the way it came when I bought it. I quickly replaced it with an E-Flite 400, 740 KVA.

For me, a direct drive low KVA brushless is the way to go - simple, no noisy gear box and no gears to break. There is also motor efficiency lost with gears involved.

It is no problem to swing a 11 or 12 inch prop of various pitches with the right motor, ESC and battery combination. Look for a motor with a KVA of 700-900 for a large diameter prop.
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Old 06-27-2008, 10:25 PM
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You need more studying.
The SS can be purchased directly with a 400 bruhsed and a LOWER gear ratio. Why buy stock gear separately?

Fast spinning motors need to be geared down to swing a larger prop. WHICH prop depends ENTIRELY on the speed of the motor and the gear ratio. So without knowing more specifics there is no answer.

That said, if you already have a SS WITHOUT a motor why NOT just go brushless?
There absolutely ARE direct drive motors that will swing a large prop-dozens of them.
Here's just ONE example. It has more prop data than you can likely cope with unlike the pathetic info Tower gives you.
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Old 06-28-2008, 01:07 AM
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I have the above example on my slow stick swinging a 10x4.7 prop just fine w/o any issues. Brushless is definitely the way to go! Since switching to direct drive I haven't looked back, and neither will you.
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Old 06-28-2008, 01:44 AM
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raad
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i was thinking i would just use what i have and not buy a new motor .. the power system on ebay has a good price, too bad i dont have paypal

can anyone give me their opinion on that gearbox and prop for the motor i have?

what else did u need to know flydiver ?
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Old 06-28-2008, 02:10 AM
  #8  
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You actually HAVE a SS without a motor?
And somehow you have a separate 400 brushed motor? Got a pinion gear (one for the motor) or need to get one of those too?
You got a brushed ESC, or do you need an ESC too?
It adds up.

Do a bit of studying on gear ratios at this GWS 400 brushed site.
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Old 06-28-2008, 03:09 AM
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Before you go buying a bunch of stuff.....Hobby City has Tower Pro Brushless outrunners combs with ESC, motor mount, and prop for less than $20.
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Old 06-28-2008, 04:02 AM
  #10  
raad
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Originally Posted by raad View Post
Hello all ,,
i want to buy this prop and gearbox for a slow stick setup , and wanted some expert advise b4 i do so.

GWS EPS-400C Gearbox w/Pinion 3.00:1
http://www3.towerhobbies.com/cgi-bin...?&I=LXHUV9&P=0

or
Great Planes ElectriFly Gearbox T400 3:1 Ratio BB
http://www3.towerhobbies.com/cgi-bin...?&I=LXAGC8&P=0


any of these two with a ( 11*7 prop )..

on..
*11.1V 1800mah battery
*400F 2250KV brushless outrunner
* CC ThunderBird18
electronics weight ~215 grams

From justgofly.com the 400F with the 3:1 gearbox and the 11*7prop will give a 26.4 Oz of thrust and pull 132Watt ,12.0Amp

can anyone one comment on this please ?

Thank you
no ,its not a brushed motor and i dont have the plane yet .. but i am about to buy everything together from Towerhobbies.com god willing,if u read the first post ,all u need to know is there .
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Old 06-28-2008, 01:07 PM
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Pudknocker71
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Check this deal out. SS kit, outrunner, esc for $50!! This is what I started on....

http://www.gravesrc.com/GWS_SLOWSTIC...tick-combo.htm
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Old 06-28-2008, 03:28 PM
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raad
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that is a good deal .. do u know if i can use the my battery on that ? or should i get a new battery ?mine is 11.1Volts ,1800Mah ,12c.
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Old 06-28-2008, 04:33 PM
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Originally Posted by raad View Post
that is a good deal .. do u know if i can use the my battery on that ? or should i get a new battery ?mine is 11.1Volts ,1800Mah ,12c.
Yeah, you should be able to use that batter just fine. Should give you decent flight time and plenty of power. That combo looks like a good deal. You just can't go wrong with brushless compared to brushed.
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Old 06-28-2008, 04:37 PM
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raad
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Thank you all for your help ..will let u know what i did
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Old 06-28-2008, 07:39 PM
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That GWS gearbox is not designed for brushless motors. It might fit and it might work, but I've seen people have nothing but trouble with those. There's a couple guys a tthe club who still run gearbox drives on their Slow Sticks, and in addition to sounding like it's about to fall apart all the time, it does fall apart quite often. I would advise against this idea, but if you must, make sure you grease it up good.

Also, you say it's an OUTrunner??? Highly unlikely that you will be able to use and outrunner on that gearbox or any gearbox for that matter, unless it's a helicopter-style outrunner, with the metal covering over the whole thing. Usually motors with 2250 kV would be an inrunner, which would be fine. Although, my TRex helicopter does have an outrunner with high kV - it's one of those weird ones with a metal covering over the rotor.
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Old 06-28-2008, 07:42 PM
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Oh... if you haven't bought anything yet, I highly recommend using one of the combos that is specifically made for the Slow Stick. The SS is extremely popular, and it's pretty much been figured out what you need to do with it. I would not advise doing something that hasn't been tested, when it's clear that you are new to this, and there are proven combinations which will be guaranteed to work right.
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Old 06-29-2008, 01:02 AM
  #17  
raad
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thank you jasmine ,its used in helicopters yes , the wires are coming from the front and the body turns , yes i am new to this. i had a few unsuccessful attempts .. but i hope this will work ..

i didn't buy anything yet , have to deposit some money in a prepaid card (safer for online purchases) ... i think i will get the combo from gravesrc.com from Florida

http://www.gravesrc.com/GWS_SLOWSTIC...tick-combo.htm

it looks ok
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Old 06-29-2008, 03:08 AM
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Originally Posted by raad View Post
thank you jasmine ,its used in helicopters yes , the wires are coming from the front and the body turns , yes i am new to this. i had a few unsuccessful attempts .. but i hope this will work ..

i didn't buy anything yet , have to deposit some money in a prepaid card (safer for online purchases) ... i think i will get the combo from gravesrc.com from Florida

http://www.gravesrc.com/GWS_SLOWSTIC...tick-combo.htm

it looks ok
yep that's perfect. I love that e-flite motor mount. Just make sure you check the build threads for the tweaks... some of them are really necessary.
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Old 06-29-2008, 11:38 PM
  #19  
Pudknocker71
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Originally Posted by raad View Post
that is a good deal .. do u know if i can use the my battery on that ? or should i get a new battery ?mine is 11.1Volts ,1800Mah ,12c.
It runs on a 2s quite nicely. 3s most likely will require a prop change. The motor they supply can be seen PB hobbies sight. Should have all the info there.
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Old 06-30-2008, 12:16 AM
  #20  
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Originally Posted by Pudknocker71 View Post
Before you go buying a bunch of stuff.....Hobby City has Tower Pro Brushless outrunners combs with ESC, motor mount, and prop for less than $20.
The example Flydiver has listed above is $20.50, and $2 more for shipping from Wisconsin. A great deal, for sure.
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Old 06-30-2008, 04:31 AM
  #21  
raad
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yes it was a good deal , but i dont have paypal , and they do not accept cards from where i live right now .. so i will go with the other gravesrc combo .. will email them and ask if i need to change the porpeller to use the 11.1V battery
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Old 06-30-2008, 04:53 AM
  #22  
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The Graves deal is pretty good. This is the motor they mention. It's a Suppo motor-decent, actually I think a bit better than the TowerPro for about 50% more.

This is the 3S spec off that page:
APC 8x4 E 11.1V 14.5A 610 g / 21.6 oz 161W

Start studying those numbers, you have to get used to them.

I JUST learned Jeff at HeadsUp has a non-ebay page, a tad cheaper actually. I know it takes paypal. He communicates well and you could check with him for other options.

If I haven't mentioned it already buy a BUNCH of spare props, you'll want them. I've gone through 3-4 in a single outing while learning. I suggest a prop saver to minimize the motor and prop carnage. BUT-once motors get over 100W prop savers start to get dicey. Use double O-rings, make sure it fits well, and preferably balance your props-a whole 'nother discussion.
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Old 07-01-2008, 06:02 AM
  #23  
raad
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Thumbs down :(

Back to square one , gravesrc does not accept international cards .. i dont understand why when its MASTER CARD ..

anyway .. so back to my first Question ..which prop and gearbox are best for the 400F on a GWS Slow Stick ?
i would rather buy from towerhobbies.com

"
*11.1V 1800mah battery
*400F 2250KV brushless outrunner 15A max
*Castle Creations ThunderBird18 ESC
*electronics weight ~215 grams
"
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Old 07-01-2008, 08:20 AM
  #24  
raad
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does the gearbox diameter have to match the motor diameter ? .. my motor has a 27mm diameter .. and most gearboxes online are 20mm or 12mm ?

also , can anyone comment on this table ?

Configuration: --------------Propeller:---Voltage:----Amps:----Rpm:----Thrust:
GWS 400C Gear Box 2.14:1---EP-0950---12V--------14.5A----9,150 ----770 g / 26.95 oz.
GWS 400C Gear Box 2.38:1---EP-1060---12---------15.0A----8,040 ----750 g / 26.25 oz.
GWS 400C Gear Box 2.67:1---
EP-1060---14V--------15.5A----8,900 ----950 g / 33.25 oz.
GWS 400C Gear Box 3.00:1
---EP-1060---14V--------12.5A----8,190 ----830 g / 29.05 oz.
GWS 400C Gear Box 3.00:1---EP-1060---14.8V------13.6A----8,760 ----900 g / 31.5 oz.
GWS 400C Gear Box 3.00:1---EP-1147---12V--------15A------6,360 ----835 g / 29.23 oz.

(copied from http://www.servohut.com/mtm_motors.htm )

Last edited by raad; 07-01-2008 at 09:08 AM.
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Old 07-02-2008, 07:12 PM
  #25  
raad
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anyone ??

how important is it to balance the propeller ?
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