|
|
Post by flash875 on Oct 16, 2009 22:16:23 GMT 1
I just purchased a 1100kv Brushless outrunner motor for my super cub and I need help with knowing what propeller to purchase. I have not received the motor yet but I want to go ahead and order everything I need to get it hooked up to my plane when it gets here. I also ordered HobbyCity 2.4 transmitter and receiver combo also a 30amp brushless ESC w 3amp bec, 3cell 1500mah lipo battery and charger, and 4 servos. Here are the specs on the motor:
Model No. : BMA2208-17
Rpm/V : 1100 KV
Weight F47g „U
Motor Dimensions F27.5mm*30mm
Shaft Size F„U3.0mm
Battery Opernating F2-3 Lipo
Current F0.4 A
Peak.Amps F4-7A
Please help
|
|
|
|
Post by flydiver on Oct 17, 2009 1:18:10 GMT 1
|
|
|
|
Post by flash875 on Oct 17, 2009 3:15:05 GMT 1
This is what I found is this right??
GWS 9 x 5 Propellers (2) Flat (D.D.)
|
|
|
|
Post by flash875 on Oct 17, 2009 3:16:49 GMT 1
Also found a pack on ebay : GWSEP9050/6P
This is a GWSEP9050/6P package of six 9x5 Propellers for electric planes (9" length, 5" pitch). Is this the right Propellers???
|
|
|
|
Post by flash875 on Oct 17, 2009 3:20:57 GMT 1
|
|
|
|
Post by flash875 on Oct 17, 2009 3:21:52 GMT 1
 here it is sorry |
|
|
|
Post by flash875 on Oct 17, 2009 3:22:35 GMT 1
let me know if these will work or if they are the ones you mentioned above... thanks
|
|
|
|
Post by flydiver on Oct 17, 2009 3:47:45 GMT 1
Those are them. This is assuming Suppo is not pulling your leg. Let me look something else up maybe more definitive-yeah, kinda like I thought a bit of an exaggeration. You cannot necessarily trust the stated specs of cheap Chinese motors. They fabricate a bit. In fact, until proven otherwise I recommend discounting ALL claims on EVERYTHING 20%. I mean EVERYTHING cheap Chinese, motors, ESC, servos, etc. Go to www.lightflightrc.com/Follow the link on top to [motors] Scroll down to your motor > click on it. Click on the link to [For specs and data .....] Then click on your motor again for a [pdf file] from someone reliable (Dr, Kiwi from RCGroups) 9x5 will work but over amp it if used at full throttle all the time (more than 30 seconds>a minute. You will be pulling over 10A on an 8A motor. GWS 8x4 (same style) looks to be safer-7.3A . It's a small motor. Don't expect a lot out of it. This is LESS powerful than the brushed motor on 3S (~13A), it just weighs a lot less so you'll be hauling around less weight. That can make a big difference. BUT----it's so light you are going to have to add a bit of weight up front to get the CG right. It's a bit more complicated than 'just buy a brushless motor'. If you want a bit more power and don't want to add a lot of weight look at a 2217-08 maybe. This would be a good choice with cheap fast shipping from a reliable guy that PUBLISHES ACCURATE DATA ABOUT HIS PRODUCTS. www.headsuprc.com/servlet/the-1425/2830-dsh-11-Outrunner-Brushless-Electric/DetailUnfortunately this is seldom the case with RC. Avoid the TowerPro motors. Their only redeeming feature is cheap. They do work, I've used and use them but they have issues. |
|
|
|
Post by flash875 on Oct 17, 2009 4:21:48 GMT 1
Here is a pic of the items I purchased from ebay:  let me know what you think will this give me more power than the stock sc motor with a lipo... |
|
|
|
Post by flash875 on Oct 17, 2009 4:46:59 GMT 1
So this would be a better deal  specs: Rotational Speed 1100 RPM/V Free Load Current 0.8A Max. Current 30A Input Voltage 6 - 22V Max. Efficiency 98% Weight 69g Motor Dimensions (Diameter x Length) 27.8mm x 32.0mm Shaft Diameter 4.00mm (Front and Back) Speed contorller requiement 30A,40A |
|
|
|
Post by flydiver on Oct 17, 2009 5:49:01 GMT 1
The fist motor will be adequate, not a power jump at all if that's what you were after. Maybe a power drop......
As I said above:
[It's a small motor. Don't expect a lot out of it. This is LESS powerful than the brushed motor on 3S (~13A),]
The 2nd motor would be much better.
WOW! look, it's 98% efficient!
You probably don't know but that is complete horsesh!t. You need to spend about $100 to maybe get a motor over 90% efficient. So, care to speculate on the other specs?
De-rate at LEAST 20%. Pure Chinese BS.
Cheap motors (brushed OR brushless) are in the high 50% and 60's. Better motors go into the 70%. Takes a GOOD motor to break 80% efficiency.
Even so you are going from 7A up to 30A and have a much better chance of getting a reasonable CG without lead.
Research first, buy 2nd.
AND, if you value your $$ I STRONGLY recommend you don't buy RC from eBAY. The place is full of crap, charlatans, and stupid high shipping. Yes, there are some good deals but YOU have to know if they are good deals. If you gotta ask, you don't know, don't go there. There are fine mail order dealers in RC. I pointed you at 2 of them (added missing link to post above). You can get information AND service AND reasonable shipping.
98%.......Whoop!
|
|
|
|
Post by flash875 on Oct 17, 2009 16:37:48 GMT 1
Thanks for your help I think I might go with the 2217-08 you mentioned above for more power since I am upgrading everything else I dont want to skimp on power.
|
|
|
|
Post by flash875 on Oct 17, 2009 16:41:49 GMT 1
Or this motor: Power Up 450 Sport Outrunner Brushless Motor
2.5 oz, 1100KV, up to 37 oz of thrust. Mount and Prop Adapter included!
from headsuprc.com
|
|
|
|
Post by flydiver on Oct 17, 2009 17:24:27 GMT 1
The 450 is another Suppo (Jeff/owner frequently rebrands items). Fine choice.
Plus all the prop data is there and he's actually measured it not speculated about it.
|
|
|
|
Post by flash875 on Oct 17, 2009 23:16:32 GMT 1
I ordered the 450 today as well as a 5pk of 1060 GWS propellers. I think i might mount it using an eflight firewall stick mount and a gws stick mount. Or is it better to just to use the original motor mount and shim? I also saw an aluminum mount on ebay for eflight motors maybe it will work.
|
|
