Aug 06, 2014, 11:40 AM
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traceyl | |
traceyl Suspended Account Thread OP | Question Alright, I asked about the best place to get SunnySky motors and several members said BUDDYRC was a great place. There was some controversy regarding V series vs X series. So, I found that the X series is far less expensive, but I hate to pay 1/3rd the price for the X series until I consult with you guys. So, is the X series worth buying? |
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Aug 06, 2014, 11:47 AM
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mattjk | |
mattjk None | I've owned x series pancake motors and they are excellent. perfectly balanced and with high quality rubber sealed bearings. I would buy them again. |
Aug 06, 2014, 01:19 PM
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traceyl | |
traceyl Suspended Account Thread OP | Quote: Originally Posted by mattjk I've owned x series pancake motors and they are excellent. perfectly balanced and with high quality rubber sealed bearings. I would buy them again. Great! I was thinking about the 900kv standard size/shape motors. They have 28 ounces of lift with a 7 inch prop..., I believe that's the prop size, but anyway, that's the lift with 11.1 volts. Also, I have heard that Sunny's are able to handle 4 batteries!. I hope so. |
Aug 07, 2014, 03:02 AM
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renatoa | |
renatoa Registered User | This is lift at max throttle, your platform AUW should be about double of this value, not 4x. |
Aug 07, 2014, 02:24 PM
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traceyl | |
traceyl Suspended Account Thread OP | Quote: Originally Posted by renatoa This is lift at max throttle, your platform AUW should be about double of this value, not 4x. Please explain the all up weight formula. I have not seen that before. You must have used the ecalc to determine the prop efficiency. |
Aug 08, 2014, 08:31 AM
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renatoa | |
renatoa Registered User | If the lift of 28 ounces is at full throttle, as I assume, then at hover is about half, 14 ounces, for an arm. Thus 14*4 = 56 ounces total weight of your platform, if you want to hover at 50%, where is advisable. 56 ounces = 1587 grams, this is a reasonable and normal weight for a quad using these motors, I wouldn't use them at more than 2kg anyway. Not only eCalc but any propulsion calculator will tell you the same. I am using mine, done in Excel, match eCalc quite close. |
Aug 08, 2014, 12:52 PM
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traceyl | |
traceyl Suspended Account Thread OP | Quote: Originally Posted by renatoa If the lift of 28 ounces is at full throttle, as I assume, then at hover is about half, 14 ounces, for an arm. Thus 14*4 = 56 ounces total weight of your platform, if you want to hover at 50%, where is advisable. 56 ounces = 1587 grams, this is a reasonable and normal weight for a quad using these motors, I wouldn't use them at more than 2kg anyway. Not only eCalc but any propulsion calculator will tell you the same. I am using mine, done in Excel, match eCalc quite close. I built a Tcopter and used cheap motors at first which have failed. AUW is about 1200 grams. |
Aug 08, 2014, 02:46 PM
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renatoa | |
renatoa Registered User | You will need at least 8", imo. |
Aug 08, 2014, 08:19 PM
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ChrisRD | |
ChrisRD Registered User | What size motors where you looking at where the V-series is a lot more expensive? For the sizes I was looking at there was only about a $2 difference in price from the X-series motors of the same size. Not that I think there's anything wrong with sticking with the X-series...they've been great for me...just curious. I'm assuming the AUW of 1200 grams for your Tcopter is with the battery? If so, what size battery? |
Aug 09, 2014, 06:38 PM
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traceyl | |
traceyl Suspended Account Thread OP | Quote: Originally Posted by ChrisRD What size motors where you looking at where the V-series is a lot more expensive? For the sizes I was looking at there was only about a $2 difference in price from the X-series motors of the same size. Not that I think there's anything wrong with sticking with the X-series...they've been great for me...just curious. I'm assuming the AUW of 1200 grams for your Tcopter is with the battery? If so, what size battery? Yes, with the 2100mah battery. I designed the t copter to be as light weight as possible. |
Aug 09, 2014, 08:47 PM
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ChrisRD | |
ChrisRD Registered User | Are those 3S-2100 or 4S-2100 batteries? I have a Tcopter with Sunnysky X2212 980 Kv motors on it that weighs just a bit more than that with a brushless gimbal and GoPro camera on-board and IMO it has mediocre power (takes a bit more than half throttle to hover) on 3S-2600 batteries with 11" props and flight time is not great...maybe 7-8 minutes. The 11" props give a bit of a choppy ride on a windy day. I have run the same setup on 4S-3300 batteries with 9" props...still not quite as much power as I would like due to the increased weight with the bigger battery but flight times are better...a good 4 minutes longer. It's definitely smoother on windy days with this combo (smaller, higher RPM props). I much preferred how the Tcopter flew before I added the gimbal and GoPro (which, along with the taller landing gear to clear the gimbal/camera brought the AUW from about 900 grams to 1300 grams with the 3S-2600 batteries). I'm going to move the camera setup to a quad soon with larger motors and just keep the bare Tcopter for fun flying. Since your setup is a bit lighter you might be OK with the 2212 motors...especially if your 1200 gram AUW is with 4S batteries and you're not looking for long flight times. If that AUW is with 3S batteries you might want to consider going to a larger motor like the 2216 . Not sure if that helps give you some ideas...just my opinion/experience... |
Last edited by ChrisRD; Aug 09, 2014 at 09:13 PM. | |
Aug 10, 2014, 01:37 AM
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renatoa | |
renatoa Registered User | We are talking about 9-11" props , he is talking about 7" props... see the difference ? |
Aug 10, 2014, 10:41 AM
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traceyl | |
traceyl Suspended Account Thread OP | Quote: Originally Posted by ChrisRD Are those 3S-2100 or 4S-2100 batteries? I have a Tcopter with Sunnysky X2212 980 Kv motors on it that weighs just a bit more than that with a brushless gimbal and GoPro camera on-board and IMO it has mediocre power (takes a bit more than half throttle to hover) on 3S-2600 batteries with 11" props and flight time is not great...maybe 7-8 minutes. The 11" props give a bit of a choppy ride on a windy day. I have run the same setup on 4S-3300 batteries with 9" props...still not quite as much power as I would like due to the increased weight with the bigger battery but flight times are better...a good 4 minutes longer. It's definitely smoother on windy days with this combo (smaller, higher RPM props). I much preferred how the Tcopter flew before I added the gimbal and GoPro (which, along with the taller landing gear to clear the gimbal/camera brought the AUW from about 900 grams to 1300 grams with the 3S-2600 batteries). I'm going to move the camera setup to a quad soon with larger motors and just keep the bare Tcopter for fun flying. Since your setup is a bit lighter you might be OK with the 2212 motors...especially if your 1200 gram AUW is with 4S batteries and you're not looking for long flight times. If that AUW is with 3S batteries you might want to consider going to a larger motor like the 2216 . Not sure if that helps give you some ideas...just my opinion/experience... Yes, 3s lipos, but I've only been aware of this hobby for a little over a year, so any advice is very welcome. |
Aug 10, 2014, 10:44 AM
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traceyl | |
traceyl Suspended Account Thread OP | Quote: Originally Posted by renatoa We are talking about 9-11" props , he is talking about 7" props... see the difference ? The reason I like T copters is because the props are out of sight when filming. |
Aug 10, 2014, 11:03 AM
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renatoa | |
renatoa Registered User | Well, this is the second of the three reasons Anyway, using these motors - X2212 980kv - for a tricopter with 1200 grams AUW and 3s pack, you need at least 10" SF prop, or 11" if using an electric non SF blade, like the Graupners. |
