mikee
Flying officer
Posts: 10
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Post by mikee on Sept 13, 2009 12:16:24 GMT 1
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Post by ginginho on Sept 13, 2009 13:05:43 GMT 1
Mikee, By all means get an E-Flite motor if you want, however I consider them to be over-priced when compared to other makes that are quite useable. A couple of sites that you may want to browse are www.headsuprc.com and www.bphobbies.com (I'm assuming you are in the states) and compare some of their offerings with similar stats to the E-Flite motors. You are really looking for something around the 1000Kv rating for a prop size that will suit the SC (9-11"). Power wise for "better than stock" without being over powered you want about 180W of power, 220-250W will give you plenty, pretty much the same as the park 480. Just my 2d's worth. |
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mikee
Flying officer
Posts: 10
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Post by mikee on Sept 13, 2009 14:29:05 GMT 1
Hi ginginho
In the states..... I wish...
No Im just down the road from you in Sunny Bournemouth...... your sugestions have been noted and Im checking into them now
Mikee
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Post by duck9191 on Sept 13, 2009 14:39:16 GMT 1
turnigy sk motors from hobbycity are good for the price. like ginginho said around 1000-1100kv would be ideal for s3 batts and the stock size prop.
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Post by ginginho on Sept 13, 2009 15:37:14 GMT 1
Hi ginginho In the states..... I wish... No Im just down the road from you in Sunny Bournemouth...... your sugestions have been noted and Im checking into them now Mikee Aaah-ha! If that's the case check out www.giantcod.co.uk the prices are most competitive and the products are good. I use the KD2217-16T in my SC. On a GWS 10x6 I get nearly 250W at just under 25amps. This allows pretty much unlimited vertical at full chat and mostly I fly at half throttle or less. I have used a 9x5 as well and get longer flight times. A mate has a KD 2213-20T in his and this gives plenty if not quite as much performance. Be aware that these motors are front mounted tho, so won't work with that mount without some modding. Another I considered was the E-Power 2215/25 which would give (I suspect) similar performance to the 2213-20T. I believe that the Thumrun Kedas are pretty good motors (maybe a 2834/18) as are the XYH brand (same as those sold by 4-Max for a fair bit more, maybe the XYH35-30 1100kv). I've also used 2 SP 2212-10's in my Twinstar swinging MA 7x4's and get higher power than that stated. They seem good quality as well. In this range I think the 2217-9T 200W would best suit the SC for plenty of power. Service from Rob at GCHQ has never been a problem. I recommend the HobbyWing ESC's, I've got 4 (add the ones I've kitted mates planes too brings this number to 7 or 8) and not had a problem with any. If you want to clone my setup, get the 40A HobbyWing ESC and 4 x 9g servos (plenty of choices on these). Only thing I don't get for the SC from there are the props, I've had varying quality, try robotbirds or BRC Hobbies (both available online). You'll be able to do the whole set up for the price of an E-Flite park motor  |
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mikee
Flying officer
Posts: 10
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Post by mikee on Sept 13, 2009 16:28:10 GMT 1
Thanks for the reply.. so if I was to bin the park motor mount idea and use the KD2217-16T... how would I mount it???
I have seen somewhere on the net cages that are adjustable to screw to the front of the bulhead and the motor fits inside it, or did you make you own one
Mike
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Post by ginginho on Sept 14, 2009 0:00:04 GMT 1
Thanks for the reply.. so if I was to bin the park motor mount idea and use the KD2217-16T... how would I mount it??? I have seen somewhere on the net cages that are adjustable to screw to the front of the bulhead and the motor fits inside it, or did you make you own one Mike My mate use a cage type mount and stuck it inside the cage, using the spinner type of prop mount. I made my own mount and use the ali thing (sort of X shaped with 4 small bolts, supplied with motor) and mounted it the other way round. You can check this thread which details the mod. If you look close you can see the prop shaft sticking out of the back. I've since swapped the PCB for perspex as that was too brittle. I did break the ali "X piece" once, but sourced a replacement from elsewhere. Alternatively, the other suggested motors should work with that mount. |
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Post by patmatgal on Sept 14, 2009 13:19:10 GMT 1
E Flite 450 is what I'm flying with. Provides more than enough power at 1/2 throttle to fly scale so when you do go WOT, Yee Haa... But then again, I'm the only person to vote in the pole above for the 450. ginginho is giving you some good advice on some specific other stuff and ordering in the UK, there are plenty of options (so many motors and so little time) Looked like the aluminum mount (I use one of those too, they're great) was for the E Flite 480, so you're pretty much locked into that one anyway. Here's a link for a motor like the E Flite 480 (has the same bolt patern, so will fit on the mount you ordered off e bay) for a bit less www.headsuprc.com/servlet/the-BRUSHLESS-MOTORS-cln-Power-Up-480-Plus/CategoriesYour being in the UK, I'm not sure about ordering and shipping, e mail Jeff Anderson and ask headsuprc@yahoo.com update: 2 weeks later and I'm still the only one that voted for a 450, must be missing something here  |
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mikee
Flying officer
Posts: 10
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Post by mikee on Sept 15, 2009 19:54:44 GMT 1
Thanks patmatgal for your and all the other options shown... managed to buy a new in the box 480 e flite motor.. at a knock down price of 55$ your money delivered in the UK ............and as I fly heli's normally and have serveral T Rex 450's and spare esc's like the first one shown at the top.. this will do nicely www.kessockmodels.com/acatalog/Online_Catalogue_Heli_Motors_And_ESC_s_9.htmlI guess Im sorted.. just need to wait for the motor mount to arrive and hopefully we will be brushless by the weekend Just need to sort out aeilrons for it now Thanks to all that commented in this thread..... I just love this little plane Mikee |
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Post by patmatgal on Oct 22, 2009 20:27:07 GMT 1
Could someone chime in on something I've noticed. Burned up my E Flite 450 (collar came off the back of the motor shaft) and I had a Heads Up RC 450 Sport www.headsuprc.com/servlet/the-BRUSHLESS-MOTORS-cln-Power-Up-450-Sport/Categories Well this motor has the same bolt patern and I figure all is good. Thing is, now that I've flown it several times (10) I'm getting flight times of half of what the E Flite motor was giving me. E Flite is 890 KV and HURC is 1100 KV. Am wondering: Does this sound right? |
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Post by Dillzio on Oct 23, 2009 3:55:29 GMT 1
Could someone chime in on something I've noticed. Burned up my E Flite 450 (collar came off the back of the motor shaft) and I had a Heads Up RC 450 Sport www.headsuprc.com/servlet/the-BRUSHLESS-MOTORS-cln-Power-Up-450-Sport/Categories Well this motor has the same bolt patern and I figure all is good. Thing is, now that I've flown it several times (10) I'm getting flight times of half of what the E Flite motor was giving me. E Flite is 890 KV and HURC is 1100 KV. Am wondering: Does this sound right? My understanding is that if you're changing from an 890KV to a 1100KV and you want you keep the same thrust and battery life, you'll need to prop down. |
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Post by patmatgal on Oct 23, 2009 5:26:03 GMT 1
Thanks for the quick response.
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Post by flydiver on Oct 23, 2009 6:00:32 GMT 1
Take a look at the props HeadsUp suggests. If you are still using the Trojan prop (9.5x7.5 for a 480 motor) you are making HEAT, not thrust. You're just lugging the motor. You are not getting more out of this way, you are getting less. |
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Post by ginginho on Oct 23, 2009 9:10:09 GMT 1
Take a look at the props HeadsUp suggests. If you are still using the Trojan prop (9.5x7.5 for a 480 motor) you are making HEAT, not thrust. You're just lugging the motor. You are not getting more out of this way, you are getting less. ...and probably drawing more juice from your flight packs too. |
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Post by flydiver on Oct 23, 2009 17:13:21 GMT 1
Sure, you don't make heat for free. The heat isn't just bad, after ~140*F it starts to get REALLY bad. Winding resistance goes up with heat, motor efficiency starts to drop, motor performs even worse, heat starts to increase dramatically, resistance gets even worse.....pretty soon you have a run away cycle and the motor burns up.
There is absolutely no benefit to over propping a motor beyond a certain point. The maximum efficiency point is not necessarily the most desirable power point but once you pull the RPM's below ~3/4 of their unloaded state the motor starts to deteriorate badly.
Like I said, you don't get more, you get less.
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