Boeing 727/100 For Twin Gws Edf-50 - RC Groups
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Jul 29, 2004, 11:07 AM
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Boeing 727/100 For Twin Gws Edf-50


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Jul 29, 2004, 11:15 AM
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Wishing she was full size, but then there's the cost of batteries!
Jul 29, 2004, 11:19 AM
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Boeing 727/100 Construction photos
Jul 29, 2004, 01:07 PM
EDF rules... :)
AirX's Avatar
Marvelous work.

Eric B
Jul 29, 2004, 01:59 PM
ParkScaleModels
zbrubaker's Avatar
David...did you add any washout into the wingtips? Where did you CG end up being?
Jul 29, 2004, 02:17 PM
KSU Flyer's Avatar
Beautiful work David! I love the in flight pictures!

Say Zeke...Did you ever fly your jet?

-Mike
Jul 29, 2004, 02:34 PM
ParkScaleModels
zbrubaker's Avatar
Not yet Mike...It had to go on the shelf for a bit. I was picking up a bunch of sidework to pay for the lasercutter I just got. Add in the 'honey-do' list, vacation and everything else that pops up in the spring/summer. I still have a couple of jobs to finish up, so I'll pick it back up in about 3-4 weeks. This really adds to the motivation since David's specs are very close to mine, and his design works!
Jul 29, 2004, 02:36 PM
Registered User
Mike.......Eric B.......... Thank you.

Now don't push Zeke, he has a full house while I have empty nest syndrome. I forgot to add in my specs.: TIME TO DESIGN & BUILD: 350 hour+. I'm sure Zeke is somewhere in that time frame.

David
Jul 29, 2004, 02:55 PM
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Quote:
Originally Posted by zbrubaker
David...did you add any washout into the wingtips? Where did you CG end up being?

I tried to build 1/8" washout into the wings with the cross bracing, but it didn't stay. After covering, one wing half had a tad of washout and I heated the SoLite on the other wing half to match.

CG is just ahead of 25% MAC. As is she is very stable. I kinda feel that I could move the CG back and she might sustain inverted flight; With 20 degrees of total stabilizer movement, I run out of down elevator, but plenty for normal flight.

David
Jul 29, 2004, 02:56 PM
ParkScaleModels
zbrubaker's Avatar
LOL...It's sad but true (not that I'd trade in my family for the hobby...most days). Mike knows all about the time and delays that go into designing a plane, with the intent of kitting it, with a full time commitment (you're finished your masters now, right Mike?)
Last edited by zbrubaker; Jul 29, 2004 at 03:03 PM.
Jul 29, 2004, 03:03 PM
ParkScaleModels
zbrubaker's Avatar
Quote:
Originally Posted by David A Ramsey
CG is just ahead of 25% MAC. As is she is very stable.
I was planning on starting out at about 30% MAC...I may have to reconsider...hmmmm. I was going to make a 1/4 scale chuck glider anyway to test the CG range. Did you do any stall tests? My one major worry is tip stalling.
Jul 29, 2004, 03:18 PM
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Quote:
Originally Posted by zbrubaker
I was planning on starting out at about 30% MAC...I may have to reconsider...hmmmm. I was going to make a 1/4 scale chuck glider anyway to test the CG range. Did you do any stall tests? My one major worry is tip stalling.
The stall is gentle. Recovery is quick; Just level the wings and let the nose drop a bit. I was originally going for 30% and had a mental argument with CompuFoil over the final placement.

25% is safe. Tip stalling and how well she flys on EDF 50s will be a result of wing loading.
Jul 29, 2004, 03:59 PM
Leave me alone!
Martin Hunter's Avatar
Now that is one cool jet! We need to see some video of that. At a 7.8 oz wing loading, she must be nicely scale.

Martin
Jul 29, 2004, 04:23 PM
Lagopus lagopus
WillowPtarmigan's Avatar
Nice airplane! Looks like the real thing.


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