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Great Planes Extra 300 .60 Build/Mods

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Old 02-09-2007, 03:11 PM
  #401
AllTheGoodNamesAreTaken
 
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Default RE: [b]Flight Report!!![/b]

FYI
Mine flies great @ 8 pounds and a Saito .91 in the nose. Very very smooth flying airplane.
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Old 02-12-2007, 06:46 AM
  #402
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Default RE: [b]Flight Report!!![/b]

LOL I have Just realised that I have the wrong version of extra on mine should be 300S and I have put 300L on it........DOHHH!! [:@] Ahh well it'll have to do coz I aint changing it now. Just goes to show how observant every one is in here lol
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Old 03-29-2007, 01:36 PM
  #403
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Default RE: Great Planes Extra 300 .60 Build/Mods

Adrian: Did the overall size remained the same?
When you placed the pieces on the plan they fitted on the overall size?
As I am starting to build this plane I'd like to know about it.
Thanks.

Quote:
ORIGINAL: AdrianM

Moving the elevators forward 1/2" make the elevators ~50% of the stab area. The counter balances make the elevators a bit more than 50%.

So...The scale outline is still there, there will be less load on the servos and I will have more pitch authority.

Thats it for today. Vertical stab and rudder tomorrow.
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Old 05-17-2007, 12:24 AM
  #404
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Default RE: [b]Flight Report!!![/b]

Hi all,
I am building the same plane ( GP extra 300 .60 ) , and have a question about the wheel pants.
THe wheels are very tight inside the pants and literally not being able to rotate . THere is no part of the pants touching the wheel and the tightness is because of the nut, that goes through the wheel and tightens at the axle . If i loosen it then the whole wheel pant assembly becomes loose.

Any help would be much appreciated ..

Thanks to all !
Gaurav
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Old 05-17-2007, 06:34 AM
  #405
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Default RE: [b]Flight Report!!![/b]

Sounds like you need to put a spacer (washer or collar) between the nut and the wheel.
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Old 05-23-2007, 10:47 PM
  #406
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Default RE: Great Planes Extra 300 .60 Build/Mods

Nice Thread.
I have just completed this plan, and using an OS .91 FX . Anyone has any ideas on using a smoke system with this engine ?
Recommended equipment for this ?
Would love to see smoke with this plane.
Thanks to all
-Gaurav
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Old 05-24-2007, 12:38 PM
  #407
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Default RE: Great Planes Extra 300 .60 Build/Mods

Take a look at here:
www.tmenet.com/smktips.htm

I already have the simple smoke pump from TME and is great, I hope this will help.
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Old 06-02-2007, 03:13 AM
  #408
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Default RE: Great Planes Extra 300 .60 Build/Mods

Thanks. I am getting the TME Simple smoker as well. Do you think it will work good with a OS .60 2 stroke ?
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Old 06-02-2007, 12:04 PM
  #409
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Default RE: Great Planes Extra 300 .60 Build/Mods

The real secret here is to preheat the oil, on 4 strokers this is a simple task but in 2 strokers this is a bit more difficult to accomplish, you will need to coil a brass tubing around the muffler or manifold to preheat the oil before it gets in the exhaust and becomes smoke.
Here is a picture of my set up in a Carl Goldberg Ultimate, using the TME simple smoke pump
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Old 08-23-2007, 03:08 PM
  #410
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Default RE: Great Planes Extra 300 .60 Build/Mods

Pweeeew, long thread but worth the read. I am just finishing up my kit. I did the tail mods and I bolted a YS 110 to the front of it.
Should be interesting! Anyone still enjoying their Extra 300s? Anyone still building ?

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Old 08-24-2007, 09:29 AM
  #411
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Default RE: Great Planes Extra 300 .60 Build/Mods

Good luck with the kit, Hughes500E
Quote:
Anyone still enjoying their Extra 300s? Anyone still building
Yeah, I enjoyed my Extra so much that is has become RIP[:'(]. I think, I had a failing x-tal during flight. Must be ones in a life time that happens? Oh well, I have already promised myself that I will build another one - it's simply that good.

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Old 09-22-2007, 12:00 PM
  #412
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Default RE: [b]Flight Report!!![/b]

hi, i'm going to put on ,ine OS91 FX,
did u think that i stil have to move to some servos to the rear of the fuse?

if so, relocate the elevatore (2 servos) or the Rudder (1 servo)?

THX
tal
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Old 09-22-2007, 12:07 PM
  #413
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Default RE: [b]Flight Report!!![/b]

i would build the frame and leave the option open to mount servos in the tail. mine i built for os 120 surpass II w/pump, have mounts for the - (2) hobbico cs35MG (1 ounce each) for the elevators, and a hitec hs 5965mg for the rudder. i balanced it before covering w/enigne mounted and placed the servos anearby held w/tape, placed the fiberglass cowl on the engine; everything as close to the prper place to get a rough balance. then i covered it. now i have a saito 100, about 8 ounces less. now i'll put the 2 ounce rudder servo in the fuse w/a pull/pull.

jon
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Old 09-22-2007, 01:11 PM
  #414
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Default RE: [b]Flight Report!!![/b]

THX,
but i'm hoping that somone hwo had installd an 90 2 C engine (OS) can give me an answer...
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Old 09-22-2007, 08:31 PM
  #415
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Default RE: [b]Flight Report!!![/b]

compare the weight. os 91 w/o muffler is 19.5 ounce, w/stock muffler about 24.5 ounce, you may save weight w/a incowl muffler. saito 100 is comparable, which is what i will have in mine. os 120 surpass III w/pump is about 34 ounce. so the difference between the 34 ounce and 24.5 ounce is about 8 or 9 ounces. there is a proportion between the distance of the engine ahead of the cg is the distance from the cg to the tail and the weight. this is only for a rough idea. for example; if the engine is 10 inches ahead of the proposed cg and the furthest point of the tail is 25 inches. then the propotion tells you that it is 2.5 times longer to the rear, so if you subtract 9 ounces from the nose, you subtract maybe 2 ounces or more. which means that with the os 91 or saito 100, about 2 ounces of servos in the rear instead of 4 ounces of servos, which i planned for the 120 w/pump. evry a/c is built differently, so, where you place the equipment to balance in one will differ in another, even w/the same engine. go to the thread gp 300s build/mods, authored by adrian, long thread, but th efirst 100 posts, you will get a real good idea of what to do. posts w/os 91 and other engines.
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Old 09-23-2007, 12:42 AM
  #416
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Default RE: [b]Flight Report!!![/b]

hi,
Thanks for the comments,
I already read the 400 posts of this thread, it helped me allot!
I guess that if I will use an 91 engine / 100 4 c I will need at least one servo in the end of the fuse, if I will use a bigger engine I will have put 2 servos at least in the rear.

I'm thinking about building it with mounts in the rear + pushroad / pull pull system to the center of the fuse…. But I think that it will be to match work, we will wait and see.

The only thing that I don’t find is the sizes of the moded rudder an elevator, and please , can U posts some pictures of the servo mounts in the rear? Anyone?
Although some pictures from the inside of the fuse….

Regrets , Matzri
ISR
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Old 09-23-2007, 12:15 PM
  #417
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Default RE: [b]Flight Report!!![/b]

go to the thread - gp 300s .60 build mods by adrian. in the first few pages he notes changes to the ailerons, rudder and elevators. the rudder is 1/2" deeper at the top line and 1" deeper at the bottom line, and he made the air balance taller by moving the top of the vert. stab down an inch or so. it's all in that thread.
i have stopped work on mine for a while now, i'll finish it one day. the elevator servos are hobbico cs35mg, 1 ounce, mini's. i added 3/32" ply plates to the servo mount that you can see in the pic's to make easier to install. you need to consider the geometry of the servo arm and of the control horn to determine the height of the servo in relation to it. i set one servo higher on one side and lower on the other side. the rudder servo was to go in front of the left elevator servo. you have to add mounting support for these servos and i added some 1/8" x 1/4" basswood strips behind to screw into.
i left the covering off the bottom to allow for rudder pull/pull if needed.
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Old 09-23-2007, 01:06 PM
  #418
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Default RE: [b]Flight Report!!![/b]

It's worth finishing
It performs very well for it's size. I love mine with the YS 110 in it!
I'll post a pic of mine as well!
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Old 09-24-2007, 04:18 PM
  #419
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Default RE: [b]Flight Report!!![/b]

jb86, this Extra should be in the and not on your wall....
find some time to enjoy it
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Old 09-24-2007, 05:42 PM
  #420
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Default RE: [b]Flight Report!!![/b]

Here is a couple pics of my kit. You can see how I built my tail, 2 servos on either side of the fuse, pull pull on rudder etc
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Old 09-25-2007, 08:22 AM
  #421
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Default RE: [b]Flight Report!!![/b]

Wow!!!
She is beautiful, is this a real aircraft schema?
Can you please take a picture of the all airplane? Maybe in the air?

One more question, did u have the YS110?
How much he weight? Where did you put the battery?
And how much the elevator servos weight?

Ok, It's more then one question, but I will happy to use your knowledge about this airplane build…. I hope to insets u during the build.

Thanks allot,
Tal matzri Israel.
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Old 09-25-2007, 09:08 AM
  #422
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Default RE: [b]Flight Report!!![/b]

Here is some of my pics. Well, before it went RIP anyway.

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Old 09-26-2007, 09:26 AM
  #423
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Default RE: [b]Flight Report!!![/b]

Here is another covering scheme, "Halcones" Acrobatic Chilean Air Force Team, O.S 120 FS Surpas II
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Old 10-04-2007, 06:17 PM
  #424
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Default RE: [b]Flight Report!!![/b]

Does GP still make this kit?
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Old 10-04-2007, 06:28 PM
  #425
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Default RE: [b]Flight Report!!![/b]

yes,
now it's cost 109$ in towerhobbies....
i'm gooing to get mine next week finely, I hope so.
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