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

GP F-4 Phantom

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Old 09-12-2003, 12:57 PM
  #1  
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Default GP F-4 Phantom

Great Planes has just re-released the F4 Phantom. I just got notified that mine shipped today! Any suggestions on a really hot engine that will fit this plane? I know Jett makes a load of really hot engines but you also need a load of money. Any other?

Thx
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Old 09-12-2003, 02:48 PM
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Default RE: GP F-4 Phantom

The only way to make it a great performer is with a Jett-90 or a OS-91VRDF engine- both are kinda expensive...

I read some folks have use an OS-91FX with decent results*

Great looking plane!
james
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Old 09-12-2003, 03:26 PM
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Default RE: GP F-4 Phantom

Wow, what's the deal? Is it the weight of the plane that makes it a dog? I was hoping an average 90 would work since it's a 60 size plane. I knew the Jett would be the answer but it is a little out of my budget.
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Old 09-12-2003, 03:27 PM
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Default RE: GP F-4 Phantom

Im finishing up my UK aerotek f-4. Its about the same size as the GP one. Ive bought a webra 91 P5 acro for mine. Im using the recomende prop of 14x12 to start out with. I hope it flys well.







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Old 09-12-2003, 03:32 PM
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Default RE: GP F-4 Phantom

Very nicely done! I really like the tailpipe detail.
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Old 09-12-2003, 03:39 PM
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Default RE: GP F-4 Phantom

Thanks, Im proud of it too :-)

It was so easy to do you wouldn`t believe it :-)

some aluminium tape, and a....ehhh..lead stick pencil....or whatever you call it to push in the rivets :-)






SJ.
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Old 09-14-2003, 08:34 AM
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Default RE: GP F-4 Phantom

I saw one once that the person used an engine with rear exaust and ran the exhaust out the engine outlets! I'm going to put a super tiger 90 in mine with a pipe under the plane! Should look like a belly tank I have not looked at the plans in awhile but I also thought of turning the engine a little to get the pipe in the middle! I have two of these original kit's bought a second one when they discontinued it also I have a wing kit! Who knew I'm Glad to see it back! I'm a Vet from Nam and it's our bird!!!!!!!!!!!
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Old 09-14-2003, 10:57 AM
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Default RE: GP F-4 Phantom

heh yeah, the british colors are a bit dull too look at.

I would rather have painted it in US colors, as they look much cooler. But the markings in the kit are for the British Phantom K model, so i settled for that scheme.

SJ.
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Old 10-01-2003, 11:35 AM
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Default RE: GP F-4 Phantom

Does anyone know if this is a repro of the same kit? were there any changes made? I heard about some fitting problems with the ABS parts on the original run.
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Old 10-02-2003, 09:05 PM
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Default RE: GP F-4 Phantom

I have the GP F-4 from the original run...
ST 90 for power...not what I'd call a barn-burner, though....
Flys nice, but not as quick as I have seen a F-14 w/ST 75 & tuned pipe...
Maybe if I add a pipe......................
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Old 10-03-2003, 08:14 AM
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Default RE: GP F-4 Phantom

Just got the Phantom kit. It is a re-release of the original with some changes. There is a label on the outside of the box that says "now with flaperon option." I also had heard about the fit problems with the ABS, but the review I read said they fixed that.

If I put a ST90 with a pipe, Perry pump, and retracts, do you think it would come close to a Patriot in performance?
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Old 10-03-2003, 10:58 AM
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Default RE: GP F-4 Phantom

What will be the "all up weight?" and what RPM's can you get from that combo?

Nice looking plane, that is-
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Old 10-08-2003, 10:39 PM
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Default RE: GP F-4 Phantom

I TALKED TO THE DESIGNER OF KIT AT SUPERMAN THIS PAST WEEKEND
THE REVISIONS MADE ARE IN THE ABS PLASTIC SIDE PANELS WHICH WERE
LENGTHENED A 1/4". MET HIM WHILE WE WERE ADMIRING A TURBINE CONVERSION
OF THE KIT.
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Old 10-09-2003, 05:54 AM
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Default RE: GP F-4 Phantom

SJN, have u already made your Webra scream ? Is it broken in ?
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Old 10-09-2003, 09:29 AM
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Default RE: GP F-4 Phantom

Hi Stykaas.

MY Phantom is a dog!!!! a slow dog...

The engine seems to perform well, but the drag on this aircraft is MASSIVE!
It will never fly as I would like it too :-(

I have tried 11 diferent size propellers, and have not come further :-(

from 11x11 props to 14x12. It realy needs the 14" prop for the pulling power. The engine realy performs well on the 11x11....if only it had weighed 2kg`s less ,and much more aerodynamicly clean.

Just too bad.... Speed realy bleeds off when doing fairly tight turns, and it drops like a rock when power is cut. It does some realy neat nose high landings. It comes in to land quite fast. And it need lots of elevator. Flaring out just before touchdown eats up the whole 1" of elevator movement. 1" on a fill flying stab is a lot!


I even opened up the intakes and exhaust to let air pass through the fuselage. The manual said it would increase speed.....I could not see the difference :-(
The plane weighs 4,6kg`s about 10 lb`s

SJ.
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Old 10-09-2003, 10:09 AM
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Default RE: GP F-4 Phantom

lANDINGS DO LOOK GOOD WITH THE
F4. This one uses a OS91fx flies ok. Anything
less and it won't get off the ground
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Old 10-09-2003, 02:33 PM
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Default RE: GP F-4 Phantom

A guy in our club has one with the .91FX in it. He says it's a lead sled. He also says the .91 is barely enough.
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Old 10-10-2003, 08:58 AM
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Default RE: GP F-4 Phantom

All this lead sled talk is making me nervous! Maybe I should just dump the kit?!

mmmmm? How do I take a couple of pounds out? Think if you ditch the plastic parts and fab those parts out of balsa it would come out lighter?
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Old 10-10-2003, 12:02 PM
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Default RE: GP F-4 Phantom

For its size, mine doesn`t weigh that much.......its more how bulky the airframe is.
I dont know about the GP kit, but my wings are REALY thick. That realy takes a toll on my model.

SJ.
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Old 10-10-2003, 05:49 PM
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Default RE: GP F-4 Phantom

but my wings are REALY thick
that gives u easy landings !!
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Old 10-10-2003, 08:23 PM
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Default RE: GP F-4 Phantom

[quote]ORIGINAL: Bucshot

All this lead sled talk is making me nervous! Maybe I should just dump the kit?!

mmmmm? How do I take a couple of pounds out? Think if you ditch the plastic parts and fab those parts out of balsa it would come out lighter?

Well its sort of true. Not a bad plane, just bad engine combinations. I have seen this plane and the GP F-15 and F-14 flying with St 90s and the owners have been very disappointed. I'm a speed man. Now i am not sure where your at or what you fly but it sounds like you want some sort of a sportscale prop jet. Find yourself a Direct Connection F-20. Throw a Jett.50 up fron and you have 125mph at altitude and 140mph around sea level. Otherwise with the F-4, F15and F14, your going to need no less than a Jett.90 and yourgoing to pay for it. Mine was around $350.
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