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Are verticals necessary on a Delta?

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Old 01-26-2009, 09:42 PM
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BiggerDanno
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Default Are verticals necessary on a Delta?

Hi everyone, first post in this forum. I started flying helis about 1-1/2 yrs ago, planes about 10 months ago and am absolutley hooked on
power and speed!!

Have built and flown:
Goldberg Falcon 56
Synapse EDF
Kaos 40 w/ .55AX 11x8 @ 14050
Mach Racer .40 w/ .46 Magnum

Waiting to be built:
Dirty Birdy 60
MagnumR w/ West 50V1

Had a bad launch on my Mach Racer a few days ago and broke off both verticals. Was wondering if these are really necessary on a Delta? No rudder.

Thanks for any help! [sm=thumbs_up.gif]
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Old 01-26-2009, 09:48 PM
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Default RE: Are verticals necessary on a Delta?

The simple answer is yes, but I suppose some egghead could rig up an automatic yaw stability device.
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Old 01-26-2009, 10:00 PM
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Default RE: Are verticals necessary on a Delta?


ORIGINAL: combatpigg

.... automatic yaw stability device.
... How about a rate gyro, somehow interfaced with split elevons for yaw control as per the B2 etc...... The more complex the systems, the more spectacular the failures.....

P
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Old 01-26-2009, 10:03 PM
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Default RE: Are verticals necessary on a Delta?

ORIGINAL: Petrovsky


ORIGINAL: combatpigg

.... automatic yaw stability device.
... How about a rate gyro, somehow interfaced with split elevons for yaw control as per the B2 etc...... The more complex the systems, the more spectacular the failures.....

P
Hey, I like that idea!
Okay, verticals it is.

I guess if the veritcal is necessary, then the area of the two verticals would be important too. Was thinking of making one the same size as the original instead of two...not a good idea, eh?
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Old 01-26-2009, 10:14 PM
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Default RE: Are verticals necessary on a Delta?

BD, Look for examples of successful single fin deltas and take it from there. It is easier to start out with an oversized fin and work your way back instead of working in the other direction. The further the prop is from the CG, the more fin you'll need.....most .40 size designs have the engine as far back as it can go, anyway. I do believe that the further back you can get the fin[s], the smaller they can be. If the plane just seems aimless on launch, like it just wants to spin, the vertical area behind the CG is lacking.
I've been thinking it would be fun to try a stunt delta with a rudder, myself.
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Old 01-27-2009, 01:27 AM
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Mike Connor
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Default RE: Are verticals necessary on a Delta?


ORIGINAL: BiggerDanno

Okay, verticals it is.

I guess if the veritcal is necessary, then the area of the two verticals would be important too. Was thinking of making one the same size as the original instead of two...not a good idea, eh?
Make the total (dual or single) vertical fin area 8% of the wing area and you should be good. If the fin extends forward very much make it a little larger.
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