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Post by NorCalAirman on Apr 25, 2011 11:57:13 GMT 1
So I'm rebuilding after my crash and I definitely need to change my torque angle. I have no gearbox to measure from or borrow parts, it was destroyed in a crash. I'm also using a much more powerful motor. Any ideas on the angle I should use or how I could mount it up?
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Post by NorCalAirman on Apr 25, 2011 11:58:37 GMT 1
Oh, here's what I had before, but the angle was all wrong.  And this is what it looks like now.  |
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Post by john66 on Apr 25, 2011 12:09:23 GMT 1
I wouldnt swear, but I believe the angle in the 2nd pic is completely wrong.
John
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Post by NorCalAirman on Apr 25, 2011 12:35:55 GMT 1
The landing gear is correct though....right?  |
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Post by toff on Apr 25, 2011 20:12:38 GMT 1
I wouldnt swear, but I believe the angle in the 2nd pic is completely wrong. John LOLOLOLOLOL!!!! ;D ;D ;D ;D Generally speaking, it's usually 2 degrees down and 2 degrees right thrust. With the motor your using, I'd suggest 3-4 degrees down. Facing the motor, place 2 small washers under the top right hole of the motor mount. This will produce both down and right thrust ( you will have to experiment with this, but 2 to start is a safe bet.) |
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Post by NorCalAirman on Apr 25, 2011 23:31:56 GMT 1
Considering it flew decent enough without proper thrust angle, I'm willing to experiment a bit at a time. Just need to get the repairs done and sort my electronics issues. I'm thinking I'll shorten the nylon spacers I used (the whole thing was 1/2" too long for the cowl) and use some rubber washers as spacers, we'll see how that works.
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Post by flydiver on Apr 26, 2011 0:17:37 GMT 1
Unfortunately thrust correction is more of an art than science. More power, more speed, more correction needed.
Cruising you generally don't need any (or little) correction at all. The problem is on acceleration.
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Post by Dillzio on Apr 26, 2011 3:45:07 GMT 1
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Post by NorCalAirman on Apr 26, 2011 12:19:17 GMT 1
Dillzio, that is EXACTLY the kind of information that I can use directly in my mount construction. thanks a ton. Now if I get REAL fancy i can put some hinges on it and add a servo to give myself a dynamic thrust angle! . . . haha, not a chance. I'll just try not to destroy it for now.
Thanks again.
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Post by Dillzio on Apr 27, 2011 7:23:35 GMT 1
glad to be of service mate.
Remember those thrust angles are for the stock setup, if you're increasing power you should also increase the thrust angle. If you set the angle with washers or other spacers you can have a fiddle and find out what works best.
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Post by ginginho on Apr 27, 2011 8:31:38 GMT 1
NorC, there is a fairly simple process listed here on how to test your thrustline. |
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Post by mythotical on Jun 8, 2011 15:53:51 GMT 1
Lets not forget about AOA. After I powered up (T-28 motor & esc) I also used a paint stirrer under the back of the wing to adjust the AOA some. Flies like a dream now
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Post by postalflyer on Jun 25, 2011 4:43:31 GMT 1
John66 and Dillzio, I would like to suggest this motor mount to anyone who is considering going brushless. www.customrcparts.com/motorMountDetail.php?productID=A100015&bannerID=1It does not work with the original setup if you stick with that but it is a fantastic machined mount that is very sturdy and has the correct thrust angles already machined into it. I hope some find it as usefull as I have. I used a parkzone 480, 30amp esc, and I run 1800 3S lipos (that fit horizontally with a new balsa battery/esc mount int the elctronics compartment,. I also have added ailerons, a balsa stuts that stiffen the wings for tight flight response that takes the flex out of the wings. I left the dihedral in and it has not hurt flight response at all. The struts are mounted to the wing with short flat aerodynamic balsa strips I made to fit down over the stock strut mounts and put plastic hinges on both ends of the strtus. The wing end mounts of the struts have the hinge end fit between the two strips at each stock strut mount. On fuse side the hinge end is up about 1.5 - 2" on the side of the fuse and go through the fuse and are glued to the top of the homemade balsa battery/esc mount. This thing flies wonderfully and is very responsive. I could take pics if anyone is interested. I hope this helps someone out there if you are a little venturesome and want a great flying super cub. Keep 'em flyin'.  |
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