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Just ran a test with a 2200mah battery and found that the tail right wag was caused by a power drop. The same issue i was haveing with the rtf system before. I have not changed the leads on this convertor yet, so i'll do that after my gig, and run some more tests tomorrow. I'm now able to hover in my bedroom, with enough control to do small tail turns. With the bigger battery the power drop wags were few and far inbetween. And the start ups with the rtf main motor still suck.
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Also, after I replaced the motor it got some kind of intermittent vibration. It has all new parts and flew smooth after installing them. When I first take off its fine, but after it warms up it acts like the gyros or servos are twitching. I got my nose in hover down. I practiced on the sim, 4#6 and V370D. Then I took the V400 to the flying field and was easily able to nose in. Not ready to try with the blueray yet. Trying to practice more slow speed circles and turns using rudder only. This is a great heli for that. I'm getting better at my inside figue 8s but need more practice to be smooth. -Craig |
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Installed the new BL system today (very easy) and with the blades off, did a test run (I had already bench tested the system) and running it up to full power I heard two very loud sharp POPS and promptly shut down and disconnected the battery. Looked everything over and nothing looked or smelled bad, so tried again and no further pops. Held it at 1/2 power for a little bit and then went on up to full power. Worked fine, except the gear whine was very loud. Powered down and checked gear lash, and it was fine, so powered up again, and could not believe how loud the gear whine was. It was nearly intolerable and thought something had to be wrong. All of a sudden it dawned on me that I forgot to order the new pinion and I was running the one that came with the motor. What an idiot!! Took a close look at the main gear, and surprisingly, it looked in good shape. I expected all the teeth to be shaved off!
So, now what were the mystery POPS? I took the motor off and in the process, three pieces of a small green tyrap drop out of the area near the motor and it was clearly broken, not cut. Can't quite figure out what happened except that something (the motor) put a heck of a lot of pressure to make even a small tyrap break in two places. At least I now know where the POPs came from even if I can't figure out how it happened. The tyrap had been in use, not just a loose unconnected one. SpadCat |
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Have you balanced your blades? Even a slight variation can cause a vibration.
Sounds good that you are mastering nose-in hovering. I have practicing that and have around 6 or 7 flights. Problem is, I am doing this in my backyard, and so have to do any maneuvers in slow motion, otherwise, one mistake and I slam into a wall, in which I have done. I figure that once I get out in the open (hopefully tomorrow morning) that it will be a lot easier. I have done full nose in circles, very slow pirouettes, and a couple of figure 8s. I am becoming a master of spinning it around quickly if I get into trouble. Lots of Fun. SpadCat |
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hey spad,
i had the same thing happen when i was bench testing mine. Two gun shots, no smoke or damage. How ever I did not see any green tyrap. After the first pop, the sticker on the motor came off, so I thought it was that. Started up again, took it up to full throttle, and pop again. I adjusted the throttle curve in my tx to 90%, thinking that the esc was pushing more power than the motor can handel. (its only 23A max burst, and I had a 40A esc pushing 100%) I dont know if that solved the poping or not, I've never had to use 100% throttle anyway. |
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Barn,
Try turning the gains down on your rx (alie and elev sens). Also, when doing so, you may think your turning it down, when your really turning it up. My #3 had me stumped one day at the field, until I started turning the gain pots the other way. I guess in walkera world, + means less and - means more, sometimes. |
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Hi Kdean, My blades did need to be balanced a little. I think your right because I recently turned the ALE and ELEV up to 80%. Looking at the heli head on they're at 3:00.
-Craig |
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Well, I guess my tyrap theory is wrong. Couldn't imagine why the electronics would do it, but hopefully it does not happen again. Maybe Wasp could shed some light on it.
SpadCat |
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I believe you are suppose to put a AA battery to the motor for a few minutes for break in . Your motor should last longer after this.
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I like the idea of using a smaller, and stronger rotor on the tail. I have three different options on the way. All are 4" in lenght, two have 4 degrees of pitch but one is made of nylon and the other made from a stronger composit material. and the other option is nylon with 2.5 degrees of pitch. The nylon props come in a pack of 6 for about $4, and the stronger ones are only $1.50 each. The pitch on the stock rotor is +10 degrees even after I shaved it down, so these lower pitch props should allow the motor to spin at a confortable rpm. |
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Last edited by kdean; Jun 25, 2011 at 06:07 PM.
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http://www.lowpricerc.com/index.php?cPath=7 The mouting is different though, usually at the back of motor. The props for planes usually comes with adaptors. Hence the shaft diameter does not really matter. We know once a BL motor stops, it takes time to restart. We have to shift the normal operating point well away from the stop point to prevent the motor from stopping completely on yewing left. That could be the other issue of using a high KV motor besides the gain. |
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I really like the look of the inrunner, though the turnigy out runner that gege has been using does not look that bad.
I've changed the programing on the esc for the tail for normal start, and have the rudder travel adjust in the tx set at 30%, so the motor does not stop. Although it does make left rudder a bit sluggish. I'm gunna take it out to the field today and play with the settings more. |
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Winds are up to 12mph+, not ideal for initial testing. So, i'll hold off on takeing #3, and take #1 and my T-XI V450. The V450 had some rudder set-up issues, i set the rod lenght to short and the gyro had a hard time trying to find center. Kind of the same problem im having with my brushless tail mod.
BTW, I did shoot some video of #1 w/alpha 400, but some kids came to the park, and i spent most of the time yelling at them to stay away from the heli. Why do kidz and people in general think that its safe to just stand next to something with high speed, exposed, spinning blades??? |
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