Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

Delta & twin tails.

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Old 06-07-2002, 11:51 PM
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soarrich
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Default Delta & twin tails.

Why is it that most deltas you see have twin tails?
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Old 06-08-2002, 03:28 AM
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WolverineRC
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Default Delta & twin tails.

Cause it looks cool.
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Old 06-08-2002, 09:59 AM
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Default Delta & twin tails.

coz when your going that fast its nice to have a spare, i've lost mine mid flight once
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Old 06-08-2002, 11:48 PM
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soarrich
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Default Delta & twin tails.

Originally posted by phillybaby
coz when your going that fast its nice to have a spare
I guess that explains biplanes too! The guy you designed the triplanes must of been a real pessimist.
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Old 05-19-2003, 12:20 AM
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Default Delta & twin tails.

Lost one of the fins on my Diamond Dust today and had no problem getting the plane down safely, even the fin that detach landed on the runway, my lucky day. xxspeed
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Old 05-19-2003, 02:49 AM
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Default Twin fin deltas

Actually, I think it allows you to get more fin area, without resorting to one large fin. I had a original design delta with a single fin which I made as large as I could without "looking over-sized". It flew OK but I really felt it would have tracked better with more area. Had I used two smaller fins, I would have had more overall fin area, tracked better, and could have made them a little stronger than the larger single fin....it would have looked better also.
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Now I have a question for you guys....Do slanted fins, have any advantage over 90 degree mounted fins???? I have them 90 degrees on my Dust, and it tracks great!????? C.
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Old 05-19-2003, 03:10 AM
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Default Delta & twin tails.

no idea.

I made mine slanted on my dust because it looks faster....lol It kinda had that F-22 look
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Old 05-19-2003, 08:08 AM
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Default Delta & twin tails.

the single fin of the same area of two fins is actually faster!
cantered over fins just look faster
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Old 05-20-2003, 12:08 AM
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Default Delta & twin tails.

I try slanting the fins inward, did'nt work plane was unstable you can see this plane in my gallery (RIP), Ill be removing it soon.
Bin making my own DD type plane ws a little smaller "31 the size of a arrow shaft and a little longer "26 because they seem to be a little nose heave and the fins "7 1/2 long and slant the fins outward.
Just bought a MVVS .40 GRRT for my next one and soom Hitec MG 645 servos for it, can't wait. xxspeed
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Old 05-20-2003, 01:58 AM
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Default Delta & twin tails.

Good engine!

That is the same one I am running and it hauls!
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Old 05-20-2003, 03:30 AM
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Default Delta & twin tails.

soarrich,

I assume that a lot of the delta speed planes that modelers fly adopted the twin fin look from real fighters, like the F-14, F-15, F-18,... The reason that they have them, according to an article I read, is to retain rudder authority at high angles of attack. Evidently, the angle at which the twin fins are canted from vertical is very carefully chosen so the vortices that trail from the leading edges of the wings at high angles of attack impinge on the outer surfaces of the two fins, preventing them from being 'blanketed' by the wakes from the wings.

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Old 05-20-2003, 06:01 AM
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Default Delta & twin tails.

now thats deep!
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Old 05-20-2003, 12:59 PM
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Default Delta & twin tails.

and theres me being told on the F-15, F-14 it was for redundancy and survivability, like having back up systems for everything. most of us have seen the F-15 that flew home on one wing, and the F-18's that had bits missing after a midair
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Old 05-22-2003, 11:20 PM
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Default Delta & twin tails.

Originally posted by banktoturn
soarrich,

I assume that a lot of the delta speed planes that modelers fly adopted the twin fin look from real fighters, like the F-14, F-15, F-18,... The reason that they have them, according to an article I read, is to retain rudder authority at high angles of attack. Evidently, the angle at which the twin fins are canted from vertical is very carefully chosen so the vortices that trail from the leading edges of the wings at high angles of attack impinge on the outer surfaces of the two fins, preventing them from being 'blanketed' by the wakes from the wings.

banktoturn

I'll make sure to remember this when i build my next speed delta...
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Old 05-22-2003, 11:47 PM
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Default Twin tails

To make a place for the tuned pipe!
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Old 05-23-2003, 12:02 AM
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Default Whiplash

Here's a Whiplash with a Jett FIRE BSE 60L, 10X8 prop and MACS quiet tuned pipe.
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