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All Forums >> RC Airplanes >> Twin & Multi Engine RC Aircraft >> UC-78 and Skyrocket
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UC-78 and Skyrocket - 11/3/2002 5:15:42 AM   
zipman



Posts: 54
Joined: 1/16/2002
From: East Brunswick, NJ, USA
Status: offline 		Hi JL Layton,

Could you tell me what plans you are using for the Bobcat (UC-78) and the Skyrocket ? I am curently starting a UC-78 using 1964 RCM plans. Specs are 65 inch span .35 - .40 engines. about 1/8th scale. I want to work my way up to Don Smith's 1/5 version in the future.
I like the Skyrocket, Are you doing the short nose or long one?

Thanks

Stan
       Post #: 1

XF5F-1 Skyrocket - 11/3/2002 6:46:04 PM   
rcalfred



Posts: 391
Joined: 12/7/2001
From: Elk Grove Village, IL, USA
Status: offline 		Stan: If I may horn in....the October 1975 issue of Flying Models featured a Nick Ziroli designed stand-off scale, short nose, Skyrocket. The prototype used Wankels. Mine has ASP 32s. If you are interested I can snail mail you the article. I, too, have the RCM Bamboo Bomber plans and will start it this winter. Have the mold made for laying up the fiberglass cowls. Are you going to try using retracts instead of the fixed gear shown on the plans? Regards.


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UC-78 and Skyrocket - 11/4/2002 3:36:24 AM   
JL1


 

Posts: 446
Joined: 2/10/2002
From: Mason, MI, USA
Status: offline 		Zipman,
The UC 78 is a small one(55" I think) powered by a pair of K&B 28's. I have been flying the thing for years & I don't remember what plans they are. I think I still have them somewhere and if you are really interested I will see if I can find them. It is a good flying little bird But it is a long way from true scale. The fuselage is pretty close but the wing is constant chord with no taper which the original had.
The F5F is From A Fred Coulson plan via Bob Holman. He has canopy, cowls and ,maybe, some laser cut parts for it.
Jon L

(in reply to zipman)
       Post #: 3

Uc-78 and Skyrocket - 11/5/2002 2:42:27 AM   
zipman



Posts: 54
Joined: 1/16/2002
From: East Brunswick, NJ, USA
Status: offline 		AL (RCALFRED)
Thanks for the response. I just wanted you to know a foam wing core is available for the RCM Pan of the UC-78 (65 inch span). You can get it at Dynamic Balsa. (I beleive they cut Wings former line of Foam Cores. I may build a glow and electric version of the Bobcat. Possible 2 choices for retracts. 1. A manual retract that Fred Coulson used in his 70 inch Grumman Skyrocket or 2. Use a Jackscrew servo like manufactured by Janaco. This would make an electric retract. Both methods would require building the struts. Hope that gives you some options.

Stan

(in reply to zipman)
       Post #: 4

UC-78 and Skyrocket - 11/5/2002 2:53:19 AM   
zipman



Posts: 54
Joined: 1/16/2002
From: East Brunswick, NJ, USA
Status: offline 		Hi JL.

Thanks for the reply. I was supposed to reply to you on the other thread but I hit new thread instead. Anyway, yes I have Fred's Skyrocket plan. I like both the short and later modified long version of the aircraft. Makes a very unique model. Great plans by Fred Coulson. A fellow near me scaledup from 3 views an 84 inch span version and flys it on 2 Ryobi 31cc engines. The plan handles great. Good luck with your current models.

Stan

(in reply to zipman)
       Post #: 5

UC-78 and Skyrocket - 11/5/2002 5:50:09 AM   
JL1


 

Posts: 446
Joined: 2/10/2002
From: Mason, MI, USA
Status: offline 		Zipman, I am going for the short nose version. I have quite a bit of documentation on the F5F, if you need any info I might be able to help you out.

(in reply to zipman)
       Post #: 6

XF5F-1 Documentation - 11/5/2002 9:13:48 AM   
rcalfred



Posts: 391
Joined: 12/7/2001
From: Elk Grove Village, IL, USA
Status: offline 		For those interested in finding info on this plane I suggest the Naval Fighters publication number thirty-one titled: Grumann XF5F-1 & XP-50 Skyrocket. Authored by David Lucabaugh and Bob Martin. Also, there is a 1/48th scale plastic model of the short nose by Minicraft Model Kits. Got both from :[url]www.historicaviation.com.[/url] Regards.

< Message edited by rcalfred -- Nov 5 2002 4:36AM >


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Skyrocket - 11/10/2002 8:56:55 AM   
zipman



Posts: 54
Joined: 1/16/2002
From: East Brunswick, NJ, USA
Status: offline 		JL,
Sorry for the late response I have been sick all week finally got some antibiotics in me. I like both versions of the Skyrocket (short and long nose ) I think the long nose version would be easier to balance allowing you to move the battery/servos more forward. although the fuse is pretty short. I have some different 3 views I purchased from Scale Model Research. I think I bought every version he had. As I said I am going to build the 70 inch span version from Fred Coulson's plan then see if I can blow it up to mabe 85-90 inches for weedwacker engines.
I have pair of homelite 25cc ready to convert.

Stan

(in reply to zipman)
       Post #: 8

Skyrocket documentation - 11/10/2002 9:11:03 AM   
zipman



Posts: 54
Joined: 1/16/2002
From: East Brunswick, NJ, USA
Status: offline 		rcalfred,

Hey, thanks for the name of the book and where to purchase it. The book and model will be on my christmas list to Santa. If I can find a similar book on the Cessna Bobcat/Uc78/t-50/aAT-17 t would be great. Most modelers must think we are nuts liking what is preceived to be 2 ungly airplanes. Personally I like the unusual in scale aircraft. The UC-78 qualifies for a warbird and has to be rather easy to build in most any scale. All the surfaces are very well proportioned and a true scale outline can fly very well. Just my opinion.

thanks again

Stan

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       Post #: 9

UC-78 and Skyrocket - 11/10/2002 6:51:16 PM   
JL1


 

Posts: 446
Joined: 2/10/2002
From: Mason, MI, USA
Status: offline 		Zipman,
I too have thought about balance on the short nose version. I have not fully worked it out but I am going to try and put everything I can in the engine nacelles and in the wing forward of the cg.
With regard to documentation, I have some stuff I got directly from Grumman. They are kind of poor quality xerox copies and I don't recall everything that was in the package. I will look it over and if there is anything of real value I will let you know.

(in reply to zipman)
       Post #: 10

Grumman Doc - Skyrocket - 11/11/2002 8:17:26 AM   
zipman



Posts: 54
Joined: 1/16/2002
From: East Brunswick, NJ, USA
Status: offline 		JL

Thanks for looking into the Grumman documentation. If you find anthing interesting let me know, No problem though as I have some good 3 views and I am going to purchase the book rcalfred mentioned. I was just looking at Fred Coulson's plan. He shows a ply box under each motor mount to be used for ballast. I really hate to add dead weight to a model. His plan shows OS .25 engines. The cowls are 7 inches in diameter. Doesn't leave much prop hanging out. I don't want to go too big with the engines cause the tank won't fit in the nacelle.
Thanks again for the offer.

Stan (Zipman)

(in reply to zipman)
       Post #: 11

Ballast - 11/11/2002 5:27:14 PM   
rcalfred



Posts: 391
Joined: 12/7/2001
From: Elk Grove Village, IL, USA
Status: offline 		Zipman(Stan): It is guaranteed that you will need ballast in the cowls. Mine has 8 ounces under each engine to bring it to the proper CG. Regards.


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Al Sortwell
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Re: Skyrocket documentation - 11/13/2002 10:34:13 AM   
soarrich



Posts: 2372
Joined: 2/1/2002
From: Middletown, NJ, USA
Status: offline 		[QUOTE]Originally posted by zipman
If I can find a similar book on the Cessna Bobcat/Uc78/t-50/aAT-17 t would be great. Most modelers must think we are nuts liking what is preceived to be 2 ungly airplanes. [/QUOTE]

The Bobcat is going to be my first twin, I've got a good set of 3-views and a 3 pack of SKYKING videos.

Rich Border

PS The XF5F, is that Larry Cressman's?

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Rich Border

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Skyrocket Ballast - 11/14/2002 7:30:48 PM   
zipman



Posts: 54
Joined: 1/16/2002
From: East Brunswick, NJ, USA
Status: offline 		Al,

One pound of ballast to balance the bird. Thanks for the info.
I still think I am going with the second model of the Skyrocket which had the long nose. This was still a tail dragger.
Regards

Stan

(in reply to zipman)
       Post #: 14

Bobcat - First twin - 11/14/2002 7:55:31 PM   
zipman



Posts: 54
Joined: 1/16/2002
From: East Brunswick, NJ, USA
Status: offline 		Hi Rich Border,

First off, yes the Ryobi powered Skyrocket I was talking about was Larry Cressman's. He is quite the modeler. After talking to him and learning that he scratch builds almost everything on his models (except mabe engines and wheels) you come away really engerized to want to build something. His Skyrocket flew very good.
Second, so you are building the UC-78 Bobcat. What size ?
As stated before I am starting with the RCM plans about 65 inch span, twin .40s. I might try an electric version using 500-600
motors and gear reduction so I can spin 11 inch props. I want to paint it the colors of Sky King's original Songbird (UC78). Colors were Cream and Red. Do the videos you have show good shots of the Songbird ?

Regards
Stan

(in reply to zipman)