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SR X250 Twin

Old 06-19-2014, 07:31 PM
  #1  
zeroback
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Default SR X250 Twin

This will be my first twin. I have another 250 that fly's like a dream. I recently rebuilt it and added the mods intended for this kit. Those were BL Lipo power, dual aileron servos, and a steerable nose wheel. So having this kit on hand and a two identical 2805's, I figured this would be a fun plane. Thanks to the QC boom there is a wide selection of counter rotating props which will allow for some experimenting ounce it's in the air. I'm also installing LED lighting. This is a super simple airframe to build the way SR designed it so the mods should be an easy task. I've decided to finish it in a USN scheme, mainly because I have a roll of Parklite blue. Might be close to the Angels blue. So far other than adding some holes to the ribs for wiring the build is straight forward.
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Last edited by zeroback; 06-19-2014 at 07:34 PM.
Old 06-19-2014, 08:04 PM
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zeroback
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Already an oops in the photo anyway.. This is the way I'm thinkin this will work. The prop shaft center is on the same line as the single motor. Seems everything in the plans is square like my foamy 3D airframes. Any one have a thought on the subject? Next comes to mind is the ESC arrangement guess I need to find out how that's done.
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Old 06-27-2014, 01:53 PM
  #3  
zeroback
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Making some headway.
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Old 07-07-2014, 10:47 AM
  #4  
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Motor mount structure built and weight check. OEM design is 24oz, with a 1350 3S pack I should come in slightly under spec.
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Old 07-17-2014, 06:38 AM
  #5  
zeroback
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Like Hangin drywall in a house the covering always makes the frame start to look like something.
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Old 07-23-2014, 10:17 AM
  #6  
Twin_Flyer
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Interesting build zeroback!

I have a 250 waiting for repairs and am enjoying your mods!

Bill S.
Old 07-23-2014, 10:25 AM
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zeroback
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Originally Posted by Twin_Flyer View Post
Interesting build zeroback!

I have a 250 waiting for repairs and am enjoying your mods!

Bill S.
Thanks,
This is were my interest in the 250 started http://www.rcuniverse.com/forum/cras...x250-saga.html
Old 07-23-2014, 10:53 AM
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zeroback
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I read that every gram of weight removed from the tail removes a total of 4 grams of overall airframe weight. I have found that to be a pretty good rule of thumb along with light is might.
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Old 07-23-2014, 06:38 PM
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Hmmm, mine is already built but I should be able to do that with a drill press... Did you use a hole saw or forstner bits?

Thanks,
BIll S.
Old 07-24-2014, 06:32 AM
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zeroback
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I use brass tubes sharpened using a #11 razor blade, and spin the tube by hand to cut balsa . For plywood I cut little teeth into the tube and stick the tube in a drill. The edge has to be re sharpened after cutting several holes. I saw this concept of a tool for sale by one of the RC company's at the LHS. I think it was $10.00 or so, it comes with a knob attached to the tube and an inner rod recoiled with a ball point pen spring to clear the plug from the tube. I use a piece of metal rod to poke the plug out of the tube after each cut.
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Last edited by zeroback; 07-24-2014 at 06:52 AM.
Old 09-21-2014, 06:23 AM
  #11  
zeroback
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On with the covering, I found these screaming chicken stickers for 99 cents, I'm not sure if I'll use them yet.
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Old 09-21-2014, 07:38 AM
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Twin_Flyer
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Where did you find those stickers? They do look cool and seem to be a good fit for the plane anyway.

Bill S.
Old 09-21-2014, 10:10 AM
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zeroback
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The stickers came from HK
https://www.hobbyking.com/hobbyking/...al_Sheets.html

I'm thinking that the bird beak would go better with the cargo plane look verses the single man bubble windscreen. I cut a 1/4 inch off the bottom of the foam cargo plane cockpit, it looks much better. I plan on using yellow trim similar to the Blue Angels scheme, My other CX250 has a colorful scheme that ultimately adds to loosing orientation. It's translucent film on the wings makes it look like it is in a different position at times, than it really is. It is small and fast enough that keeping track of were it's at is best done by memory not visual orientation if the frame is at much distance. So, I make lots of turns and keep it close.

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