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Old Apr 08, 2011, 09:50 AM
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Question
Delta Wing Craft: Nose or Mid Motor?

I've seen basically two types of Delta Wing craft in these forums: Motor in the nose and motor mounted in the middle, near the CG.

Now, with a nose motor, one has to put the Lipo near the tail for balance.

For a mid mount, the motor and the Lipo are both closer to the CG of the plane.

Any advantages to one design over the other? Better to keep to large masses close together, or farther apart?

Thanks!
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Old Apr 08, 2011, 03:07 PM
Trapped in California
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United States, CA, Arcadia
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In my opinion, motor in the middle is best. I've built a number of foamboard deltas this way and they perform superbly. I like to keep as much as possible near the CG, and position the battery wherever it needs to be for correct balance.
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Old Apr 08, 2011, 03:32 PM
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Nose is best if you want to prop hang. Keep the battery near cg and move servos etc to the rear so you can use different size batteries without too much issue. Mid motors protect props, but are generally too loud for my taste. The simple delta by dekan is a superb design!
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Old Apr 08, 2011, 04:29 PM
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Are the front motor planes that much quieter?

Do you have a link for the dekan design?

Thanks!
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Old Apr 08, 2011, 06:45 PM
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Simple delta. http://www.rcgroups.com/forums/showt...t=simple+delta

I set up my phone decibel meter but forgot and had the mic upside down on the cabinet.

Here are similar motors both 8x4's but the prop in slot is a sf prop.

Other vids of these planes on youtube can here a difference too.

Prop in slot vs tractor noise (2 min 16 sec)
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Old Apr 08, 2011, 06:45 PM
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My preference is the tractor (nose) configuration. Quieter since the prop is being fed with undisturbed air. With my Komet design in my avatar, the battery sits right on the CG - a good thing because you can put any size battery in the same place without disturbing the CG. The Komet is not a pure delta, but it can be done with deltas as well. On the negative side, it puts the prop in a vulnerable position.

Another choice is placing the motor fully aft in a pusher configuration. Speed-wise, a tractor or a pusher is a better choice than an mid mount, at least in my experience.
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Old Apr 08, 2011, 07:10 PM
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Tailess is always cool. I like my xp-39

Tailless XP-39 maiden flight (1 min 20 sec)
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Last edited by tymbrewolf; Apr 08, 2011 at 11:43 PM. Reason: added vid
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Old Apr 08, 2011, 07:21 PM
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I like mid due to the tractor style just looks weird.

I made some quick and easy prop in a slot style triangles that would hover in mid air at about 30-45 degree nose up, you could turn it either direction you wanted, 180~360 or whatever, then just fly off, its the first video in the following link. Something to see in person. And the build is ridiculously simple.


http://www.rcgroups.com/forums/showthread.php?t=1123782
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Old Apr 08, 2011, 09:59 PM
Canadian Bacon
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Kingston, Canada
Joined Jun 2004
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Here's my 8 yr old Pogo. Finally put her to rest about a week ago. Died of old age. It would hover hands off with a rearward CG. Sweet flier. Made a new smaller one.

Gord.
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Old Apr 09, 2011, 12:00 AM
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If you want delta, tractor, very easy, indestructible and RET, I would humbly submit the best RET Delta on the planet.

6mm EPP Bullseye Delta.wmv (5 min 38 sec)
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Old Apr 09, 2011, 07:26 AM
Winging it Ò>
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Joined May 2006
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The FireFly is a great indoor/outdoor prop in slot delta. Very rugged, versatile and easy to build.

The 3D Delta is the most aerobatic delta. Highly maneuverable, hands off hovering yet very pitch stable at high speed. It also shows that a tractor delta can look good.

3D Delta, test flying (3 min 50 sec)
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Old Apr 09, 2011, 07:54 AM
gpw
“There’s no place like Foam”
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United States, LA, New Orleans
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Well , since we're posting Delta videos ....
A-12 movie.mov (5 min 30 sec)
Here's Gene Bond and I trying out the 48" A-12 with BW motor in the slot ...

The Prop in the slot IS pretty Noisy ... and since deltas usually balance somewhere in the middle ... the question becomes whether you want to prop hang or not ... But one more consideration , the PITS configuration Does seem to offer more prop protection ...
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Old Apr 09, 2011, 11:57 AM
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It is funny how the clean air is quiet. You can really notice the difference in the turns. The only real way to truly be happy its some of each.
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Old Apr 09, 2011, 04:51 PM
complet beginer
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depends what you want and how good your servos are. but with it at the front and vary back you cant do thrust vectoring. or alot harder when its not in the middle. at the rear if your batery or esc ect. falls of (i use velcro so this is a problem for me but for others maby not depending how you build your plane but valcro is strictly easyer to build) its cought in the shreder (propeller).
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Old Apr 09, 2011, 05:16 PM
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Here is an example of voting for the simple delta and why a tractor is cool. Goldguy I believe is on the sticks in this video.

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