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Old 02-11-2013, 04:46 AM   #26
Nodd
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Originally Posted by soarrich View Post
Nodd
If you stand 9G servos up they mount really well in 3 thickness' of foamboard.
I made a 60" wing using foamboard without a spar without problems, I built the KFm-4 airfoil a little differently though:
http://www.wattflyer.com/forums/showthread.php?t=68902
Thanks. Yeah actually it looks like I can mount my servos horrizontally & have them completely flush to the wing's surface. Mounted vertically, the ones I have, stick out a fair amount. They're a smidgin larger than 9g, otherwise I may have considered doing that.

Less fin
It's possible I got a little fin-happy there. Here's a simplified fin setup that I think should offer plenty of yaw dampening, while minimizing interference drag...



Now you see it, now you don't
I've been pondering how to make the EDF go away when she's gliding. If this were a regular pusher-prop I could just use a folder to streamline the airflow. As far as I know, no one has invented a folding ducted-fan, so here's what I came up with instead...



A cylindrical sleeve covers the intake ducts until power is needed. That then slides back exposing the intake when it's go time...



I have a few ideas how to do this, will probably use a pull/return-spring system hooked up to a long throw servo. Slots in the fins & wing will act as guide rails.

So that takes care of the intake duct's drag. Now you're going to point out that I still have a blunt end where to duct exits. I'm okay with that I think. Especially as many cars are deliberately designed with blunt rear-ends supposedly to improve fuel economy somehow...



Yeah I'm not sure I'm buying that either but it is in keeping with the KF airfoil's tech... eddies creating aerodynamic shapes for the air to pass over. To be honest I'm not too worried about the exit duct, it is what it is. Anyway so that's the latest design...



Still looks cool & that's what's important right? *wink*

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Old 02-11-2013, 05:09 AM   #27
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That looks neet Nodd The one thing that might be a problem, is that you will not have any cooling air circulating on the motor with the air intake closed shut and that might cause your motor to overheat and burn up after a hard run and then closing the air intake, that would be my only concern, other than that, It looks great

I may be getting Older, But I Refuse to grow Up I am Having to much Fun to Grow Up LOL
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Old 02-11-2013, 05:29 AM   #28
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Well yeah the motor would be shut down when the intake is closed. At that point it won't need any further cooling as it won't get any hotter than it already is, being shut down-n-all. Besides the rear of the EDF is still open to the air. I don't foresee a problem. Now if the intake cover gets stuck, that's a different story *grin*

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