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Post by phantom on Jul 24, 2011 7:37:26 GMT 1
I have a parted out T28-D Trojan. I am rebuilding it (waiting on a new ESC right now) and I was wanting to put the Servos, ESC, Brushless 480 Motor, and Receiver in my Super Cub LP. The reason for me doing this is:
1) If I crash my Super Cub, it is way cheaper to repair than my T28-D Trojan.
2) I need to learn how to use my new DX6i Transmitter so I don't crash my new T28-D Trojan (I am only used to the old FM mhz transmitter that came with my SC).
3)I'm not looking for more power, but training on the DX6i Transmitter controls (I have the Flight Simulator but it's not the same as flying for real).
I know that I can use the Servos, Receiver, and ESC with my SC, but can I use the old motor mount off of my T28-D and just mount it were the old SC motor is mounted on the Firewall?
I know that the SC has the motor turned a little to compensate for torque so do I have to turn the 480 Brushless motor to compensate for the torque also?
I want to do this without crashing my SC on its maiden flight.
Thanks in advance!!
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Post by nwillitts on Jul 26, 2011 1:59:34 GMT 1
yes.
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Post by renard80 on Jul 26, 2011 11:37:45 GMT 1
I stand to be corrected, but my understanding is that the SC firewall is configured (angled) for this purpose.
Therefore, the motor mount will automatically achieve the correct angle when you screw it onto the firewall.
Perhaps the more experienced members will confirm - or deny?
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Post by iflyforfun on Jul 26, 2011 14:29:50 GMT 1
The stock Super Cub "Gearbox/motor mount" has the angle built into it!!!! Aftermarket motor mounts like this:: www.customrcparts.com/Tutorials/InstallationInstructionsTurnigy3536-SuperCub.pdfHave the angle machined into the mount. I have never used a caliper and measured the Firewall extension(where it bumps out for the motor mount) to see if it has any angle, but just looking at it I dont think so. |
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Post by flydiver on Jul 26, 2011 15:20:42 GMT 1
Torque correction is a function of the plane and the motor/power used. There is no 'magic' number, you have to tune to the package.
In general, the more the power, the more the correction needed. How sensitive the pilot is to the accuracy is another issue entirely.
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Post by renard80 on Jul 26, 2011 23:09:43 GMT 1
Torque correction is a function of the plane and the motor/power used. There is no 'magic' number, you have to tune to the package. In general, the more the power, the more the correction needed. How sensitive the pilot is to the accuracy is another issue entirely. I'm sorry, fly, but that is as clear as mud to me!  Can I put this simply? As it happens, this evening I too have replaced my stock SC motor with a brushless motor (thanks, john66 by the way  . The firewall is shaped, therefore when I screwed on the motor mount the motor / prop shaft automatically angled to allow for torque. No adjustment is possible. So I really do not understand what you mean by 'tuning to the package' and 'the more the correction needed'. Please will you explain further? |
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Post by iflyforfun on Jul 26, 2011 23:27:50 GMT 1
Even before fly has a chance to respond, I have a question!!! Or 3!!! What type of motormount did you buy for your brushless conversion??? Are you saying that the motor mount that you just installed for your brushless upgrade has NO thrust angle machined or adjustment built in??? If I understand your post, your saying that the plastic firewall has all the thrust angle built into it? I'll let fly take it from here!!! @fly, how do you even begin to explain "P Factor" |
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Post by renard80 on Jul 26, 2011 23:58:58 GMT 1
What type of motormount did you buy for your brushless conversion??? Are you saying that the motor mount that you just installed for your brushless upgrade has NO thrust angle machined or adjustment built in??? If I understand your post, your saying that the plastic firewall has all the thrust angle built into it? 1. I've no idea what type of motor mount I bought! I simply bought a package "suitable for the SC" - motor, ESC and mount included. The motor mount lined up with the screwholes in the firewall, no problem. 2. Yep, the motor mount has no adjustments possible. (Neither, incidentally, has the stock SC motor mount.) 3. I am no expert, but looking at the firewall it is angled, presumably to afford the correct torque automatically. |
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Post by flydiver on Jul 27, 2011 5:45:08 GMT 1
The original firewall is angled. You should at least match that angle. With more power and speed you may need to angle it even more. Lots of people have noticed that with more power and speed they get a surprising amount of unwanted lift. HOW you go about doing that (Hint-try washers under the mount) and HOW you figure out the proper amount is a bit of a tuning challenge. To increase your level of knowledge, possibly frustration, and likely confusion at this stage take a long look at this and book mark it for further study. You won't get it all at once. Take a single part and work with it for awhile, then another....etc. www.wtp.net/DBEST/trimchrt.htmlThis is an easier read: www.anything-rc.com/rc-airplane-training.htmlAnd.or just Google this or something like it: [downthrust on rc planes] New addition - may also be of interest to those experiencing excess lift: Super Cub Decalage Shim www.rcgroups.com/forums/member.php?u=334949 |
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Post by renard80 on Jul 27, 2011 15:54:26 GMT 1
Ah, now I understand what you meant, fly. Thanks for the explanation.
I hadn't realised that it is possible - and sometimes advantageous - to adjust the motor angle in the manner you describe.
The more I think I finally understand this RC flying lark, the more someone like you comes along to prove that I don't. ;D
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. The firewall is shaped, therefore when I screwed on the motor mount the motor / prop shaft automatically angled to allow for torque.