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Post by Gabe on May 26, 2010 21:38:38 GMT -6
I started the F-22 depron build today. The cutting was pretty intense, took me about 2.5 hours to print and cut out everything.
Just got the base together with one cf tube. I'm calling it a night.
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19000rpm
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Post by 19000rpm on May 27, 2010 6:02:17 GMT -6
I started the F-22 depron build today. The cutting was pretty intense, took me about 2.5 hours to print and cut out everything. Just got the base together with one cf tube. I'm calling it a night. I found that building the RCPOWERS F-117 also. It requires a lot of accurate cutting to get it to go together properly. And if it isn't built straight it won't fly so well. I know more than one guy who found that out.  The score and fold technique makes for some pretty weak joints IMO. I added some hinge tape in a couple of areas because of that. Look forward to you flight report.  |
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Post by Gabe on May 27, 2010 12:15:40 GMT -6
Got her all together this morning (pic to follow) but the Super Mega Jet V2 was binding at full throttle. Swapped it ou for the Micro Jet V3. Raining of course. I will report back soon.
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19000rpm
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Post by 19000rpm on May 28, 2010 5:37:39 GMT -6
Got her all together this morning (pic to follow) but the Super Mega Jet V2 was binding at full throttle. Swapped it ou for the Micro Jet V3. Raining of course. I will report back soon. Did you check the timing on the ESC? That might be the cause. |
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akent
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Post by akent on May 28, 2010 10:32:26 GMT -6
Yep, those are intense to build! I never flew mine because it's not straight. I didn't feel like tearing it apart to make it straight.
If you are running a Turnigy ESC, they come stock set to low timing.
I am running them at mid timing with all motors now.
Kent
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Post by Gabe on May 28, 2010 11:39:34 GMT -6
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Post by Gabe on May 28, 2010 11:41:22 GMT -6
Got her all together this morning (pic to follow) but the Super Mega Jet V2 was binding at full throttle. Swapped it ou for the Micro Jet V3. Raining of course. I will report back soon. Did you check the timing on the ESC? That might be the cause. I didn't. I couldn't find instructions for setting it up. None came with it. I would like to change some things on it anyway, so I'll probably end up contacting Grayson about it. |
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19000rpm
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Post by 19000rpm on May 28, 2010 14:59:20 GMT -6
It looks nice. I'm sure grayson will help you out.
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Post by Gabe on May 28, 2010 16:46:34 GMT -6
Grayson said it sounded like a loose bullet connector and the motor was "miss firing". So I checked everything and it turns out it was a bad solder on the Deans connector. I had some old wiring on the solder that was getting in the way. Long story short, I cleaned it up, re-soldered it and she spools up nicely. I'm gonna hold off for the park for this one - just so it doesn't land on the roof or something!
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19000rpm
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Post by 19000rpm on May 29, 2010 5:50:19 GMT -6
I've had my share of bad solder joints. Those bullet connectors can be iffy. Ray won't even use them. He solders straight from wire to wire.
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Post by Gabe on May 29, 2010 11:14:02 GMT -6
She flies!
I started with a lighter battery - 1300mah Outrage 25C pack and I'm using the Super Mega Jet V2 from Grayson now that I got it working. The takeoffs were the hardest part for me to get right. The plane seemed to want to roll hard right on take off with no response to my left stick input. I had a hard belly landing once and a tree caught it the second time (thanks pal!).
I had my first successful launch when I backed off the throttle to about 1/3 to 1/2 and gave it a little left aileron on takeoff. I think the torque of the motor coupled with the lack of airflow was causing the right roll. I did three or four flights on the 1300 mah batteries but was only getting about 2 1/2 minutes before the low voltage cutoff stopped the motor dead (ahhhh!).
Soooooo, I grabbed my trusty 2200 mah Zippy's and moved them around till I got the COG right. It took the creation of a velcro safety strap to get me comfortable with this since the battery is so far back. About half the battery is past the hinge of the access hatch on the bottom with nothing securing that end. I hot glued velcro to the bottom of the hatch too so it would mesh up with the velcro on the battery.
All said and done - she flies great! Its a very stable plane, even in the wind. Rolls on a dime and loops can be so tight that she stalls out completely. Inverted flight is very stable too. Take offs are still a little sketchy though - I'm just giving myself a little extra room.
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19000rpm
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Post by 19000rpm on May 29, 2010 16:39:48 GMT -6
Congrats Gabe I think you're right about the launches; the roll is torque combined with low airspeed. |
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akent
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Post by akent on May 29, 2010 20:02:27 GMT -6
Sounds like that one flies great! I need to either fix mine or build another one, it sounds like!
I still have some Depron laying around.
Cool!
Kent
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19000rpm
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Post by 19000rpm on May 30, 2010 6:10:22 GMT -6
I might have enough Depron to build one, but I'm not sure I really want to though. I think I'll let you guys have all the fun... |
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Post by Gabe on May 30, 2010 8:57:50 GMT -6
If you want the plans, just PM me.
I also realized that on the launch, one of the elevators was deflected slightly up - well, enough to cause roll. They have a type of thrust vectoring on them that causes a quick response when the prop wash hits them. Its great for an elevon style plane.
I have the two elevator servos on a mix, since they are two different brands with two different servo ranges, torque, timing, etc. I just needed to dial down the mix percentage on one of them to make sure they are moving in sync.
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