RE: Goldberg Ultimate 10-300 build  
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RE: Goldberg Ultimate 10-300 build - 11/22/2006 4:55:05 PM   
thanosg2004



Posts: 63
Joined: 10/12/2005
From: Voula, GREECE
Status: offline 		Lee,
thanks very much for your reply.
I have one more question : Do you think that with the OS120 fs pump in front and with 2 elevator servos aft
the model will be tailheavy ?
I will keep you all up to date and post pics as soon as I start building it. ( Cant wait to start But have to wait courier ).
I live in Greece so I have to wait a little untill the kit arrives at my door. Goldberg's models are very popular here in Greece even if there is no distributor and we have to order from US and pay courier cost too ( 80 $ for this one ).

Thanks again for your reply,

Thanos.

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Whoever said that money can't buy happiness, didn't know where to shop ! ! !

(in reply to R/C Lee)
       Post #: 401

RE: Goldberg Ultimate 10-300 build - 11/22/2006 10:47:43 PM   
jb86


 

Posts: 376
Joined: 12/20/2004
From: Ashburn, VA, USA
Status: offline 		the 120 fs w/pump is about 35 oz. i have one, great running engine. lees' saito 125 is about 25 oz., you'll need some tail weight to balance against the engine. you might want to do some kin of a mock up. w/my gp extra 300 .60 w/120, i balanced it w/o covering to see where to put the servos, i ended up w/ 2 tower mini cs35 mg (1 ounce each) elev. and 1 hs5645 mg on the rudder all in the tail. mock it up w/engine cowl, ect. i tape the servos on to the sides of the fuse, just to hold things to see where it balances. know one thing about that pump, i burned up my 120, the pump was clogged. i sent it in for warranty service, they replaced the pump, ring and cylinder. run the engine atleast every 3 weeks or so, otherwise it will get clogged. i had it happen to my 91 fs two years ago also. run the engine, open the needle valve, if it don't richen, it's clogged.
jon b

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saito club #235

(in reply to thanosg2004)
       Post #: 402

RE: Goldberg Ultimate 10-300 build - 11/23/2006 3:33:44 AM   
R/C Lee


 

Posts: 162
Joined: 12/21/2002
From: Black Butte Ranch, OR, USA
Status: offline 		Thanos, Jon has an excellent point in that before you cover your Ultimate, rough install all of your equipment (engine, tank, battery, receiver, servos, pushrods, etc) and check the balance. That should tell you whether putting the elevator servos aft will result in a tail heavy airplane. You'll get a little tail weight with covering material and tail bracing, but that's easy to balance after covering. With my Saito, I had to mount my 6V 2200maH battery pack up against the firewall even though I had all of my servos in the fuselage near the cg. Your OS 120 will give you a little more nose weight which might be enough to balance the aft mounted el servos, but you'll have to check. By the way, since the airplane uses a lot of lite ply, be sure to use four pieces of triangle balsa to reinforce the fuselage along its length and use large triangle balsa to reinforce the firewall (with epoxy).
Got my new fg cowl from Fiberglass Specialties today and started cutting it out for the ST 3250. The cowl is very well made and is better than the first one I got from Stan's.
Keep in touch, Lee

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Shot up, engine overheating, losing oil, but still flying.

(in reply to jb86)
       Post #: 403

RE: Goldberg Ultimate 10-300 build - 11/23/2006 4:21:04 AM   
baldrick


 

Posts: 44
Joined: 2/28/2006
From: Christchurch, NEW ZEALAND
Status: offline 		Hi all. I moved away from using triangular stock for fire walls and U/C mounts years ago. The problem with it is the direction of the grain in relation to the glue joint. Instead of this I now use west epoxy and fibre strands (either fibreglass or carbon tow strands cut to short lengths) Mix an approx amount to do the job so the strands are wet. Use your finger to force the mix into corners then wet your finger and run it over lightly till smooth. The strands all lock together and is relatively light, easily sanded if required.
I have heaps of building to do before I start my ulti but can't wait!!.
There is alot of great tips on here. Some of which I will try but I have a few ideas that I will impliment aswell. The cabanes will be replaces with stainless and the top wing will bolt on. Just don't personally like the idea of a pin holding the area with the most strain.
Happy building and flying guys.

(in reply to R/C Lee)
       Post #: 404

RE: Goldberg Ultimate 10-300 build - 11/24/2006 5:54:58 PM   
R/C Lee


 

Posts: 162
Joined: 12/21/2002
From: Black Butte Ranch, OR, USA
Status: offline 		baldrick, good point about the tri stock and it sounds like the fibre strands and epoxy are a significant improvement. I'm glad you are going with stainless for the cabanes, as I was very disappointed at how easily the kit supplied cabanes twisted in my hard landing that did no damage to the wings or fuselage. Keep us updated on your build as well. Thanks, Lee

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Shot up, engine overheating, losing oil, but still flying.

(in reply to baldrick)
       Post #: 405

RE: Goldberg Ultimate 10-300 build - 11/24/2006 7:40:50 PM   
baldrick


 

Posts: 44
Joined: 2/28/2006
From: Christchurch, NEW ZEALAND
Status: offline 		I have an old ulti here at the moment. I bought it cheap to fix up but it's too far gone for that. I've had a good look at the construction and noted many area's that I personally am not happy with. The joy of stainless is you can go thinner but have more strength. I'm thinking of going stainless for the U/C as it can have lightening holes drilled in it.
What are other peoples opinion about the elevators and rudder construction? I'm a bit suspicious about them flexing during a snap roll or other more violent manouvers.
When I finally start it i'll let you know of the mods I do. I've got a back log of models as I do repair jobs for others so my table is pretty much always taken up. Plus 2 young ones and looking for a house... If there was 36 hours in a day I'd be building for 12. Dreams are free :-)

< Message edited by baldrick -- 11/24/2006 7:47:04 PM >

(in reply to R/C Lee)
       Post #: 406

RE: Goldberg Ultimate 10-300 build - 11/25/2006 10:07:44 PM   
R/C Lee


 

Posts: 162
Joined: 12/21/2002
From: Black Butte Ranch, OR, USA
Status: offline 		baldrick, you might consider contacting Ken (see my 11/21 post) about a carbon fibre landing gear. I bought one from him to replace my Stan's "dural" gear, and I really like it. It's light, very strong, and it flexes nicely when I forget that the Ultimate likes to be flown down to a landing instead of stalling and falling that last 3 feet . As to the rudder and elevator construction, I haven't found it to be a problem, no matter how much stress I put on it. However, I used Sullivan carbon fibre tail bracing, tying the fin to the stab to the fuselage, so I haven't had a problem with flex during a snap or spin. There are a lot of good ideas throughout this thread that you might want to incorporate in your build. It's certainly an airplane worth building. Lee

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Shot up, engine overheating, losing oil, but still flying.

(in reply to baldrick)
       Post #: 407

RE: Goldberg Ultimate 10-300 build - 11/25/2006 11:32:50 PM   
baldrick


 

Posts: 44
Joined: 2/28/2006
From: Christchurch, NEW ZEALAND
Status: offline 		I'll check out the carbon u/c at some stage. The problem with NZ is you have to double the US dollar and add shipping which sometimes makes it very expensive. I'm going to go through all posts again and write bits down the look at the old ulti. I'm looking at putting in a 1.20 2stroke as I have one lying here and is quite light. I may get another engine for it but will see when building.

Keep up the good work guys

(in reply to R/C Lee)
       Post #: 408

RE: Goldberg Ultimate 10-300 build - 11/26/2006 1:06:29 AM   
10-300


 

Posts: 17
Joined: 6/19/2002
From: white Plains, NY, USA
Status: offline 		Hi guys,

On mind I also replaced the firewall with a 1/4 5 ply birch. I also replaced the 3 stringers from the firewall to the cockpit with hardwood, balsa doesn't cut it with that engine. also I left the 2 fuselage cutouts at the fuel tank compartment and glued them in. I'm using a YS 120 and figured that this engine is big on torque. So a little extra strenght at the front end wouldn't hurt. I also made extra mounting pads for the cabanes were they mount. The instruction have you bolting the cabanes too 1/8 light ply. I just added another 1/8 ply to the fuselage at that area where the cabanes bolt to the fuselage. I also used two servos mounted in the bottom wing. Just make hatches and hide the servos in the wing, one servo to drive 4 ailerons, I don't think so!! You can pick up the book by harry higley called "bipes" it will show you how to make the hatches for the ultimate. Just as a warning if there is a weak spot in this design its the landing gear!!!! whatever you can do to beef it up, do it you'll be glad you did. Also I replaced all the abs plastic with fiberglass. I am right know mounting the cowl then the wheel pants paint them and its off too the field. This plane goes together very nice. Its a great plane I have flown others and fell in love with it. The most important and the best advise is build it straight and align it straight. Don't forget the 3 degrees of right thrust. You'll need 3 degrees with the engine your going to use. And by-the-way your engine choice is nice very nice! That plane will probable be the best flying plane in your hanger. I have a feeling that after you fly your ultimate your going to be so happy that you'll want to build a bigger one. Also paint the canopy from the inside if your going to paint the frame thats molded into the canopy. The only thing I did that I'm probable sorry I did was I covered mine in 21st century fabric. I always have a love affair with bipes covered in fabric. My next project on deck is the balsa USA DVII. Good luck with the build.

(in reply to tuwood)
       Post #: 409

RE: Goldberg Ultimate 10-300 build - 11/26/2006 7:01:10 AM   
WarbirdAirRacer


 

Posts: 641
Joined: 12/18/2002
From: Littleton, CO, USA
Status: offline
quote:

ORIGINAL: tuwood

BTW, Corsair, that is one sweet looking Ultie.

Which kit is that? I might have to put that one on the radar screen.



I just got done framing mine up about a 9 months ago and the kit is a awesome kit but if you cant speak and read German then it is not a good idea for you. I do have a build thread here in kit building forum...just do a search for my SN and you should find it.

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Tat-Tude 379

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       Post #: 410

RE: Goldberg Ultimate 10-300 build - 11/26/2006 7:05:26 AM   
WarbirdAirRacer


 

Posts: 641
Joined: 12/18/2002
From: Littleton, CO, USA
Status: offline 		And now I am finishing up a CG Ultimate that I will be adding a gas engine too. I will post pics in a few days....guess its time for a bit of change from my old YS powered Ultimates.

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Tat-Tude 379

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       Post #: 411

RE: Goldberg Ultimate 10-300 build - 11/26/2006 2:09:23 PM   
FlyerBry



Posts: 449
Joined: 9/12/2003
From: Washington, IL, USA
Status: offline
quote:

ORIGINAL: WarbirdAirRacer

And now I am finishing up a CG Ultimate that I will be adding a gas engine too. I will post pics in a few days....guess its time for a bit of change from my old YS powered Ultimates.


WarbirdAirRacer,

What gas engine have you chosen to go with on your Ultimate?

(in reply to WarbirdAirRacer)
       Post #: 412

RE: Goldberg Ultimate 10-300 build - 11/26/2006 4:18:38 PM   
WarbirdAirRacer


 

Posts: 641
Joined: 12/18/2002
From: Littleton, CO, USA
Status: offline 		I will be dropping a DA50 in it....it seems to be about the lightest with the power I am looking for....the ZDZ and others are close but I might aswel go for the bacon as they say. lol

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Tat-Tude 379

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       Post #: 413

RE: Goldberg Ultimate 10-300 build - 11/26/2006 4:21:30 PM   
WarbirdAirRacer


 

Posts: 641
Joined: 12/18/2002
From: Littleton, CO, USA
Status: offline 		I also add alot of my own mods to the Ultimate even for YS and I will be doing the same other then sheeting the wings.....As I sheet the wings fully and make the top wing bolt on rather then that dumbass pin rod they have you do....if anyone has question on how to do it I will post the full steps in a day or 2.....please let me know.

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Tat-Tude 379

(in reply to WarbirdAirRacer)