9sec240
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naturalasperiphobic
Posts: 261
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Post by 9sec240 on Dec 21, 2009 1:27:58 GMT -5
I have a few flights on mine and it is CRAZY fast. I am running no flybar weights and 100% throttle curve. I tached the head speed at over 4700 RPMs which is FAST in my opinion. Probably a lot to do with how quick collective and cyclic are. I am going to get the eagle tree on it soon and have some real data and graphs.
Ivan
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Post by Jerrymac on Dec 21, 2009 1:51:08 GMT -5
Great video Ivan, thanks for sharing it . I am not nearly as good a pilot as you are, but now at least I know what that little guy can do. I gotta get me one of them as soon as I get my 425 build finished.
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9sec240
Full Member
naturalasperiphobic
Posts: 261
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Post by 9sec240 on Dec 21, 2009 2:10:54 GMT -5
Jerry, that is not me flying in the video. That is a buddy of mine Dave Cameron. He is a much better pilot than me. You can cruise my YouTube channel and see my flying though.
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Post by Jerrymac on Dec 21, 2009 2:46:44 GMT -5
Well, than I must say that your friend Dave is a very good pilot. Much better than me. I will check out your you tube vids though.
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Post by dunkonu23 on Dec 21, 2009 3:39:20 GMT -5
Let's not be too modest!! I've seen your T-Rex 450 pro video and I have to say your stationary flips are super clean--and nose-in, too! Scott Jerry, that is not me flying in the video. That is a buddy of mine Dave Cameron. He is a much better pilot than me. You can cruise my YouTube channel and see my flying though. |
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9sec240
Full Member
naturalasperiphobic
Posts: 261
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Post by 9sec240 on Dec 21, 2009 22:18:51 GMT -5
OK.. this probably explains the crazy cyclic and collective. Attachments:
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9sec240
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naturalasperiphobic
Posts: 261
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Post by 9sec240 on Dec 24, 2009 14:32:31 GMT -5
I got the JR DS285 servos today so I am going to work on getting the new electronics installed. Hopefully fly it tomorrow at the dome. I am going to work on getting it tamed down a bit.
I am going to try lower head speed, 200 paddles, shorter flybar, bigger weights or any combination of the aforementioned. Got any suggestions as to what order you would try things in?
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Post by dunkonu23 on Dec 24, 2009 14:46:46 GMT -5
Wow... that's pretty radical. It seems to me that you're okay with the collective response, but you want to tame the cyclic response a lot. Here's what I would do first, and it doesn't involve disassembling a thing... I'd bump up the aileron and elevator expo a lot, first. If that doesn't work, I'd lower your throttle curves. If that's not cutting it, I'd go with the flybar weights next. If that doesn't work, shorter flybar. I did the shorter flybar thing on my BH500 because even with expo it was way too fast for me. I don't think I'd change the paddles. I think the combination of expo and lower head speed will do the trick, honestly. That thing is ripping up the air as it stands now. I know on my Gaui 550, when I first built it I didn't like the slow cyclic at all. I just bumped up the headspeed and it was more to my liking. Let us know what you decide, Ivan. Happy holidays! Scott I got the JR DS285 servos today so I am going to work on getting the new electronics installed. Hopefully fly it tomorrow at the dome. I am going to work on getting it tamed down a bit. I am going to try lower head speed, 200 paddles, shorter flybar, bigger weights or any combination of the aforementioned. Got any suggestions as to what order you would try things in? |
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9sec240
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naturalasperiphobic
Posts: 261
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Post by 9sec240 on Dec 24, 2009 14:59:57 GMT -5
Scott, in that video, the AIL and ELE expo was already at 20%. I have tried 15 to 25% and it is just too reactive no matter what.. and at 25%, it was getting too hard to control as stick movements needed to be larger than what I was accustomed to. I put the small flybar weights and it did not seem to do much. I do not mind the collective speed or the cyclic speed for that matter... it is just not stable in a hover or in flight. You are constantly chasing it around. My T250 hovers hands free for seconds at a time. My Gaui 200 was pretty damn stable too and FF was unbelievably stable. The 255 is constantly moving.
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Post by dunkonu23 on Dec 24, 2009 15:17:28 GMT -5
Didn't know that, Ivan. So.. I'd lower the headspeed first, if you have't done so already, then I'd put heavier/more flybar weights on it to increase gyroscopic effect.
Scott
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Post by Jerrymac on Dec 24, 2009 19:34:31 GMT -5
I would tend to agree with Scott on the head speed. I know on one of my little beater King2's I had a 4200kv motor with a 13T pinion and it was crazy fast, but I had a lot of trouble controlling it. I dropped to 10T pinion and it is much easier to control, but a little mushy on the collective. I think it will be just about right with an 11T.
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9sec240
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naturalasperiphobic
Posts: 261
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Post by 9sec240 on Dec 24, 2009 19:49:29 GMT -5
I have a 14T and a 13T pinion in my cart at Hobby King. With their new cheap shipping, I should just scoop those up and get them shipped. I think either of those would suit the heli better than the 15T on there now. I like flying in F2 at 100% flat(ish) so I think gearing it down is the best bet.
I just checked the flybars and it looks like the long EP200s flybar is a bit shorter than the stock EP255s flybar. I think it will be a viable option.
I just got the new gyro and tail servo installed. Now its time to work on the cyclic servos.
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Post by Jerrymac on Dec 24, 2009 20:03:55 GMT -5
Well, I am really thinking about getting a 255 in the spring, so keep us posted on what set-up you end up with that you like.
It is nice when someone has the time to go through all the trial and errors on a new heli to get it right, as that always helps others when they start their build.
Good luck, I hope you end up with exactly the set-up you are looking for.
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9sec240
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naturalasperiphobic
Posts: 261
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Post by 9sec240 on Dec 31, 2009 17:17:22 GMT -5
I have gotten a couple flights now with the new JR electronics and I am not satisfied yet. I tamed down the head speed by running an 85% throttle curve which I think is just about right for the heli. I am not happy with the tail... I am beginning to think that there is a geometry issue in the tail that is causing it to be over active. On both setups with the GU210 / DS09GMD and G270 3D / DS290G I have had to run the ball on the servo arm all the way in and adjust limits to the low end of the rang and can barely run any gain on the gyro. I feel that the control arm imparts too much tail pitch movement for the given servo movement. I am not sure how to correct this yet. I will keep you updated.
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Post by Jerrymac on Dec 31, 2009 18:34:08 GMT -5
How did the DS285 servos fit? I think I remember seeing one of your posts over at the "struggling" thread where you listed quite a few servos that didn't fit well. Wish I could be of some help with the tail issue, but since I don't have the 255 yet I have no ideas, other than maybe trying some smaller tail blades.  |
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9sec240
Full Member
naturalasperiphobic
Posts: 261
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Post by 9sec240 on Dec 31, 2009 20:48:54 GMT -5
Jerry, I was disappointed in the JR DS285s. Mainly because of the style of mounting they come with. They soft mount the servos with rubber bushings with a metal sleeve. If you need to hard mount like in a helicopter, the holes are too big. I ended up having some servo adapters from my Protos that I cut in half and used. The other disappointment was the servo horns. The holes in the horns were huge. Too large for a micro ball screw. I ended up having to buy Du-Bro micro horns to install the servos. The servos actually fit the helicopter nicely and work well. I think the hot ticket would be Align DS410s though. Those should bolt right in with no adapters or mods. I wanted to try the 42mm Gaui 200 blades but it turns out the blade root is thicker on the Gaui 255.  |
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Post by Jerrymac on Jan 1, 2010 1:46:18 GMT -5
I wanted to try the 42mm Gaui 200 blades but it turns out the blade root is thicker on the Gaui 255. Well, I know this might sound like a "hack job" , but I had a similar problem on one of my King2's. I was running a 4000kv motor with 12T pinion, Xtreme 43T tail upgrade and Xtreme 10T tail drive gear and the tail was wicked fast. Like in your case, I had the ball on the servo arm in as far as possible and the gyro ATV at something like 30% and it was still too sensitive, so I did some Jerry-rigging. I laid the tail blades out on a disc sander and removed about 6mm from them, then balanced them by lightly hand sanding the tip of the heavy one. After that I set the ball on the servo out about 6mm from center and gyro ATV at 70% and it actually tamed it down a little too much as I had to run the gyro gain (gear ) at nearly 90% to get it to hold. I don't really fly it much anymore, but I think trimming some stock tail blades about 4mm would do the trick on my King2. |
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9sec240
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naturalasperiphobic
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Post by 9sec240 on Jan 2, 2010 17:42:35 GMT -5
The latest videos. This is my buddy Dave flying his Gaui Hurricane 255
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Post by dunkonu23 on Jan 2, 2010 21:12:14 GMT -5
Wow! That 255 is fast!! That red plane looked like it encroached a couple of times, too. Very cool videos, Ivan!  As you know, I'm having drift issues with my 450 pro, too... They'll get fixed just like yours issues with your 255 will. Is your friends 255 having similar issues? Scott |
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Post by Jerrymac on Jan 2, 2010 21:49:23 GMT -5
Wow, I admire your friend Dave's flying skills. Hope I can learn to fly half that good someday. Very nice control.
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