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

Skyfire-40

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Old 05-15-2009, 09:15 PM
  #1  
p.j
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Default Skyfire-40

Hi all. I have just finished building my first Delta , a Skyfire 40 from Four PI,inc. I was wondering if anyone has had any experience flying one of these planes and could tell me how it handles. I would also appreciate any tips on flying my first delt.

Thanks P.J
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Old 05-15-2009, 09:28 PM
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Default RE: Skyfire-40

I'm pretty sure that is the same plane as the old TF Holy Smoke. Had one of those with an HB 40PDP. A real nice plane and docile on landing. Kinda miss that plane, elevator servo died in flight and that was all she wrote.
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Old 05-16-2009, 07:19 AM
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I would suggest that you set the elevator throw to about 50% of the aileron throw. These deltas are quite sensitive in pitch. With my deltas I set the ailerons for "all Ican Get" then set the elevator to somewhere between 30-50% and start with around 60-80% expo on both. My deltas are all elevon equipped so the mixing is done in the transmitter. I believe your Skyfire has a seperate elevator.

I hope you enjoy your delta.

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Old 05-16-2009, 10:48 AM
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Default RE: Skyfire-40

The ailerons have 3/8 up and down and 3/4 for elevator. Ihave expo at30% but will up it to 70%. I am using a TTpro 46 for power. One more question, how critical is the balance point on these deltas?
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Old 05-16-2009, 08:24 PM
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Default RE: Skyfire-40

I would try very hard to get the CG within the recommended range for the first flight. Although weight is your enemy, it may be necessary to add weight for proper balance with a 46. Try to set it up so the weight can be easily removed on subsequent flights to see how it reacts. My experience with the Hanger 9 Twist taught me how a tail heavy plane reacts. The elevator had to be pushed down to lower the nose for landing or it would stall and drop like a rock.

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Old 05-18-2009, 09:46 AM
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Default RE: Skyfire-40


ORIGINAL: Wiggy

I would suggest that you set the elevator throw to about 50% of the aileron throw. These deltas are quite sensitive in pitch. With my deltas I set the ailerons for "all Ican Get" then set the elevator to somewhere between 30-50% and start with around 60-80% expo on both. My deltas are all elevon equipped so the mixing is done in the transmitter. I believe your Skyfire has a seperate elevator.

I hope you enjoy your delta.

Wiggy
I found the opposite to be true on my Mach Racer.

Aileron throw 50% of elevator.
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Old 05-18-2009, 12:21 PM
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Default RE: Skyfire-40

The recommender throws are close to what BiggerDanno has said so I think I will try them first. I had to add a bit of weight to the back of the tail otherwise it would have been quite nose heavy. Justlooking for some nice weather and my cold to get better so I can give her a try.

Thanks for the input- P.J
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Old 05-20-2009, 11:26 AM
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Default RE: Skyfire-40

It is a copy of the smoke WHICH FLYS GREAT!!! One of the best deltas I've flown. I built mine with elevons and no landing gear. Wish I still had it. One of my servos broke loss from the rails. Enjoy IT!
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Old 05-28-2009, 11:51 PM
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Default RE: Skyfire-40

Paid $15 for it at a swap meet last fall. I'll get around to it some day.
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