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GP Extra 300 60 size Building Hints

Old 12-28-2002, 06:27 PM
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T. Mitchell
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Default GP Extra 300 60 size Building Hints

Any comments on building would help.
I'm going to install pull-pull on the rudder and a satio 100 up front. Any feedback!

Thanks,

Troy
Old 12-28-2002, 06:46 PM
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CAPtain232
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Default GP Extra 300 60 size Building Hints

I have heard that they come out tail heavy, BUT with this engine combo, you may want to get the plane completed MINUS the elevator servo(s) and see how she balances out. Then place the servo for the elevator accordingly. Keep me posted on your overall thoughts of this plane. I am planning on getting one of these and doing some major lightening to it to get best possible 3d plane.
Old 12-28-2002, 07:52 PM
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toyking23
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Default GP Extra 300 60 size Building Hints

On the fuse sides that are light ply, they bend around and glue to the fire wall. Soak these and pre-bend into that shape, prior to gleeing. I started by bending around various size cans, large to smaller.
If I did it over, I wouldn't have glued the belly pan on until after I covered the wing. I would have temporary fastened it to insure the proper location then removed. Covered the wing and belly pan separate, then removed the covering at the attaching points on the wing and epoxy down.
Landing gear fastens with wood screws. I used blind nuts and bolts. Due to I don't always make smooth landings, and the wood screws came out. After I installed the blind nuts and bolts, no more problems on less then perfect landings.
Old 12-28-2002, 11:34 PM
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Default GP Extra 300 60 size Building Hints

My full review at: http://webpages.charter.net/rcfu/Kit...Extra300S.html
Old 12-30-2002, 01:30 PM
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T. Mitchell
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Default GP Extra 300 60 size Building Hints

Thanks for the info guys. Keep it coming.

Troy
Old 12-30-2002, 02:07 PM
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ParticleMan
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Default GP Extra 300 60 size Building Hints

Be careful with the wing. I've busted the sheeting more than once. I did the most damage when I joined the wing together though. Mine is still under construction. It's getting a Saito .91. The Canopy will be tinted within the next day or so.
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Old 12-30-2002, 05:54 PM
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MinnFlyer
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Default GP Extra 300 60 size Building Hints

I had a YS91AC in mine. I put the barrey behind the servo compartment to balance it, and it had unlimited vertical! Even with a smoke system!
Old 12-31-2002, 01:50 AM
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SigFazer
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Default GP Extra 300 60 size Building Hints

Hi, i got one of these for christmas and im just starting the wing now. I am thinking about using a 91 FX on it, and being 16 i can't afford anything much more expensive. Is this a good engine to use on it? Also I enlarged the rudder about 1 inch, was this a good or bad idea? If you have any more suggestions let me know, Thanks.
Old 12-31-2002, 02:08 AM
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Default GP Extra 300 60 size Building Hints

Fazer, your rudder will be fine, just be sure to use a good servo on it (min 60 oz/in)

A 91 2-stroke will be an excellent match for this plane. A buddy had a St 90 on his and it would almost go ballistic vertically.
Old 01-01-2003, 12:48 AM
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SigFazer
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Default GP Extra 300 60 size Building Hints

Thanks, thats good to here. I will probably use a pull pull with atleast 100oz of torque on the rudder, but i have never set up a pull pull. Is it hard? Also should i go with a dual elevator servo setup or just a single servo? I will be using a JR 662 radio. Thanks again.
Old 01-01-2003, 02:58 AM
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Default My Little Extra 300 (60 size GP Kit)

Here is a picture of mine. I havent finished it yet but it is almost there. Futaba Radio Gear, Coreless Rudder Servo, OS 1.20 pumped, Pull Pull Rudder, Elevator servos (2x) in rear for balance, and enlarged rudder and elevator halves.
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Old 01-01-2003, 03:01 AM
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Default Finished the cockpit today

I still need to trim/paint the canopy but at least the floor is done. I am contemplating adding a pilot but an not sure. Keep weight down!
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Old 01-01-2003, 05:15 PM
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Default GP Extra 300 60 size Building Hints

SunDevil, what's the material used to finish the cockpit??
Old 01-01-2003, 07:29 PM
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bwindrum
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Default GP Extra 300 60 size Building Hints

I'm just framing mine up now, hope to finish the wing today. One question, I can't seem to find any reference to the cockpit floor ??

I have both a Saito 91 and an OS 91FS but am thinking of taking the OS back to the LHS and getting a Saito 100, any thoughts ?? Also, how important is it to enlarge the rudder to enable knife edge ??

Thanks guys

Bob
Old 01-01-2003, 08:02 PM
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SigFazer
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Default GP Extra 300 60 size Building Hints

Wow that looks Great SunDevilPilot! Did you build up the ailerons or are you going to use solid ones? Also, i have never built a plane with a plastic cowl before (only built a fazer and somethin extra) and i was wondering if the ABS cowl will be fine or wether i should work some more and get a fiberglass cowl. Thanks
Old 01-01-2003, 10:50 PM
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Default GP Extra 300 60 size Building Hints

BWINNDRUM, the stock rudder will allow you to maintain or slightly climb in knife edge. If you're looking to perform knife edge loops enlarge the rudder slitghtly might be a good idea.

RE cockpit floor - there isn't one! Just make one out of 3/32" balsa if you decide to instal a pilot. If not, just hide the hole with covering material.
Old 01-01-2003, 11:13 PM
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Default Cockpit/Ailerons/Cowl

For the cockpit floor I used some left over balsa sheeting that I had from the kit. There is no mention of it in the instructions of plans so you just have to make it up. I could have just covered it over but I wanted to try this rock stuff out. I used a thin sheet of balsa then painted it with this http://www.lowes.com/lkn?action=prod...00090-7995-830 . As for the ailerons I built them up. I really enjoy building wings so constructing them was ok with me. They only take about an hour to make so running out and finding the right size stock was not an option for me. As for the Cowl, you can go ahead and use the ABS one but be forewarned "IT WILL CRACK". Every ABS cowl I have had cracked so now I only use Fiberglass. The one on my GP Extra came from Stans Fibertech and was of good quality. I did have to do some sanding due to release agent marks left in the glass job but it is still far superior to ABS.

Good Luck, Phil (Mesa, AZ)
Old 01-02-2003, 01:01 AM
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Default Little More Progress

Well, the weather stayed good so I was able to continue with the painting of the cowl. I decided not to do the shark teeth like the real one has due to my fear of messing that up. I just extended the red up to the front of the cowl. I may add eyes to it but that will be done with trim tape before the cowl is clear coated. I am very pleased how this is turning out and it is fun to try out new techniques, like the cockpit floor. Almost done, just need to finish the radio installation.

Phil (Mesa, AZ)
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Old 01-02-2003, 12:38 PM
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Default GP Extra 300 60 size Building Hints

Anybody know what the fiberglass tape in the kit is for? There is no mention of fiberglassing center joint of wing nor is there any pictures of center section being fiberglassed.

I am going to power mine with a Y.S. 61ls. I've got a Y.S. 120 to transplant after I get comfortable flying it. I had a CG Chipmunk that the YS 61 was in and it flew very nice-plenty of power with 13-8 prop. this looks like it will come out lighter and bigger than the Chipmunk so am hoping it will be a good combo for me.

I enlarged the rudder 3/4" and installed pull-pull controls. Also built up ailerons. Almost got solid ones but am glad I didn't. They came out very light and straight.

I am to the rear turtledeck building process now. Hopefully I will get some pictures posted of my work.
Old 01-02-2003, 03:02 PM
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ParticleMan
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Default GP Extra 300 60 size Building Hints

The tape is used to reinforce the cowl when assembled. It also is used for support on the screws of the cowl.
Old 01-02-2003, 10:22 PM
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Default GP Extra 300 60 size Building Hints

I guess I didn't read that far ahead! Opps!

Thank's Particleman
Old 01-02-2003, 10:40 PM
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LawDog101
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Default Gotta love this plane!!!!

I am on my third one. I love it.

Things to note:

1. A .91 2s is perfect for this plane
2. Mine was nose heavy with the cowl and pants (Stan's) so I moved one of the battery packs of my EMS Jomar battery backer farther back in the fuse.
3. I used two hs-225bb servos for each elevator half, and a single hs-225 bb on each aileron.
4. used a hs-5625 digital on the rudder with a pull-pull setup.
5. used a hs-85bb on the throttle.
6. Use 4-40 hardware on the whole thing with good clevises and ball links. Trash the stock stuff.

Mine weighed in just a the bottom of GP's weight range. With a 14x6 wood prop, mine is a monster on vertical and knife-edges very well with very little coupling.

Email me if you have any more questions.

James

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