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Post by dunkonu23 on Mar 24, 2010 22:45:41 GMT -5
If you run into CG problems, you may want to try Hyperion batteries. They may be a bit lighter. All this depends on what your CG is like initially. In my mind, I don't think too much about mounting servos on the boom as long as the main body of the servo is on the left side of the boom. That way, it will be less likely to be struck by the blades in the event of a boom strike. Then again, that's not telling you anything new, Ivan. LOL! Scott
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9sec240
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Post by 9sec240 on Mar 24, 2010 22:55:11 GMT -5
I found a deal locally. One of the guys I fly with has a 9254 to sell me. That should be perfect for the 425!!! I can't wait to get this flying.
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Post by Jerrymac on Mar 25, 2010 0:37:03 GMT -5
I think you will be fine with 2 3s 2200mah batteries. I just weighed one of the 6s 2500mah that I got for mine and it is 412 grams, and it was not extremely nose heavy.
Now Bill has me wondering. I have never crashed my 550 yet, so didn't know the booms broke that easily. I have crashed my Blackhawk 450 many times and never damaged the tail mounted servo.
So now I am gonna go move my electronics around some more to see if I can get the CG right with the servo in the frame. I am using a JR DS3500 which is a mini servo.
Thanks for the tip Bill. ( Sorry Ivan, didn't mean to hijack your thread )
Jerry
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Post by billmay on Mar 25, 2010 10:19:05 GMT -5
Now Bill has me wondering. I have never crashed my 550 yet, so didn't know the booms broke that easily. Jerry Didn't mean to get you to change your setup all around Jerry. ;D ;D Being the crash master that I am, I tend go for the durability rather than performance options. Same reason I tend to prefer G10 rather than CF parts. CF may be strong for its weight but it is still brittle and less durable than the G10. G10 weighs a little more but I'm also the odd type that likes to add weight to my helis for stability. ;D ;D I've also had the same issue with CF booms on my 450....in the right crash they will snap completely apart. Actually wish they made a G10 boom for the H550....it would help balance COG with heavier batteries!!
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Post by Jerrymac on Mar 26, 2010 0:24:15 GMT -5
Well Bill, actually I had 2 reasons for mounting the tail servo on the boom. One of course was to help get the CG right, but I was also thinking of putting it there for another reason before that. When I put my 550 together I mounted the tail servo in the frame. After a few flights the belt stretched a little and needed tightened. Moving the boom back to adjust the belt also caused the tail pitch slider to move so I had to set the tail up again by lengthening the control rod. After about a dozen or so flights, the belt needed snugged up again, so, same thing all over. With the servo mounted on the tail boom nothing changes when sliding the boom in or out to adjust belt tension. I wanted to maiden this thing Saturday, but, now I am moving electronics around again so it likely won't happen. Not sure yet where the tail servo will end up except that it will definately be somewhere behind the main shaft.
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9sec240
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Post by 9sec240 on Mar 26, 2010 20:32:24 GMT -5
Man... I can not wait to get the tail servo. I am excited to get this thing in the air and see what all the fuss is about.
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9sec240
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Post by 9sec240 on Mar 28, 2010 20:42:53 GMT -5
Well, I pulled the motor out of the Trex 500 ESP today to install the Scorpion in its place. The 500L I pulled out of the ESP is now going into the Gaui 425 along with an Align 60A ESC. I am getting closer. I changed my mind on the gyro and decided to just use a trusty Futaba GY401 instead of the Gaui GU-210. I really do not want tail issues on this bird. I should see the Futaba S9254 this week which means I could maiden the 425 this coming weekend!!
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Post by Jerrymac on Mar 28, 2010 21:18:26 GMT -5
Glad to see that you are getting closer to finishing the build. Personally, I think the GY401 is a better choice than the Gaui gyro. There are a few guys over at Freak that are using the GU-210 and they say it is OK for basic forward flight, but lacks severely in backward flight.
I have no experience with either, as I am using JR gyros on both my Hurris, but, I haven't really heard any complaints on the 401.
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9sec240
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Post by 9sec240 on Apr 1, 2010 19:39:45 GMT -5
I am a bit bummed. The guy that I bought the 9254 servo from "forgot" to ship it. He is local(ish) at about an hour away and I fly with him on a fairly regular basis. I was really hoping to get this thing flying this weekend.
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Post by Jerrymac on Apr 1, 2010 23:46:19 GMT -5
Heck, if he is only about an hour away I would ask him to just meet me halfway somewhere and go get it. ;D Offer to bring beer,lol, that usually helps.
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9sec240
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Post by 9sec240 on Apr 3, 2010 18:49:41 GMT -5
The S9254 tail servo showed up today!!! I now have everything I need to get the 425 flying. I am going to get it in the rotation to get worked on. I have a bunch helis I need to get working on.
Today I also got the servo gear sets I need to get the 500 ESP flying again. This past week I got the cyclic servos and ESC for the Outrage G5. Although I do not have the stabilization unit yet, I still want to make some progress on it. I have a Gaui 200 build that I have been putting off since converting my FES to flybarred. I am also working on a friends B400 he crashed.
I am really excited about the 425 so I think I will probably move it up on the list.
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Post by billmay on Apr 3, 2010 20:51:52 GMT -5
I'll be very interested to hear what you think of it since you now have experience with so many other helis to compare it to. Good luck with it!
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Post by 9sec240 on Apr 5, 2010 1:42:36 GMT -5
After getting the 500 ESP repaired and flying again, I finally had some time to work on the 425. I got everything finished with the exception of the connector on the ESC. CG worked out perfectly with the 2 X 3S up front. I set it up for 11 degrees of pitch and 8 degrees of cyclic to start. I will scoop up an EC3 ESC connector tomorrow and should be able to maiden it tomorrow after work assuming the weather is good. Attachments:
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Post by Jerrymac on Apr 5, 2010 1:49:59 GMT -5
Glad to hear it. I will be curious to know how you like it.
What kind of head speed are you going to be running?
BTW, what happened to the horizontal tail fin? I didn't notice one on the heli in the pic.
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Post by 9sec240 on Apr 5, 2010 8:09:22 GMT -5
Jerry, I bought the heli new but assembled mostly. I did not get the horizontal stab, head button or any spare parts. Part of what took me so long was picking up small hardware I needed to complete the heli. I have been interested in picking up an upgraded fin set but have just not found something that I like.
Head speed is going to be fast. I will probably have to turn it down in the throttle curve. I think I posted in the thread what combo of gears I have and IIRC, it was going to be in the 2500s at 100%.
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Post by 9sec240 on Apr 5, 2010 19:51:07 GMT -5
IT IS ALIVE!!!!! The Gaui 425 is ALIVE!!!
I picked up an EC3 ESC connector at lunch today and rushed home right after work to solder it up. I had not set the ESC up which needed to be done. I thought I had a 5.1V step down regulator but it turns out I used it on the Trex 600 CF so I decided to reduce the output of the ESCs BEC down to 5V. I programmed the throttle range, no brake, mid timing, mid battery cutoff, soft start, fast throttle and 5V output and then set up my throttle curves in the TX and I was ready to fly. The first set of batteries was a pair of 1800mAh E-Flites from my B400 days. I could tell right away they were not up to the task. I ran the packs out anyway just trying to dial in a throttle curve and gyro gain. I was running out of light but through a Turnigy 2650mAh 6S 20C. MUCH better. I am a bit scared of the cheap blades, plastic grips, head speed, pitch curve, non "OK" gears etc but I did a few pitch pumps anyway. It flies light and move FAST. I am looking forward to getting it out to the field where I can actually fly it and put it through its paces. I want to do a thorough post flight now and make sure everything looks OK. So glad to finally get this thing airborne.
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Post by 9sec240 on Apr 5, 2010 20:27:15 GMT -5
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Post by Jerrymac on Apr 6, 2010 1:07:47 GMT -5
That's great, glad to hear you got it in the air. Not sure how the plastic blade grips hold up with high head speeds, as I put the CNC head block and grips on mine. But, I am running an all plastic head on my 550 , swinging 550mm blades and had no problems yet, although the head speed on it is only about 1900. Not sure how heavy the T-Rex 500 is, but with the CNC parts, full size servos, full size JR G770 gyro, and a 6s 2500mah battery strapped on, my Gaui 425 weighs in at 2070 grams. I thought that might be kinda heavy, but my only flight, which was some back yard hovering and a couple pitch pumps it seemed to have a ton of power. I haven't gotten it out to the field yet as the wind was nasty all last week here. Will be looking forward to some flight reviews and vids when you get it out to the field. I hope you like it. Those are some nice looking fins. Jerry
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Post by 9sec240 on Apr 6, 2010 19:51:04 GMT -5
On to the video!!!
And the flight just before the crash on the 1800mAh E-Flite 20Cs..
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