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Building Tips and technical articles. => 1/2 A building. => Topic started by: Allan Perret on October 01, 2010, 09:44:34 AM
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Several years ago I wanted to build a 1/2A Nobler. Took the plans from Brodak Original Nobler kit and had them reduced to 70%. The spinner at .7 was just a shade under 1.25". I could not locate a 1.25 spinner that I was happy with so thats as far as the project got. Now there are 1" aluminum spinners available from Brodak and also Lee Machine Shop. Anybody ever use either of those ? I am going to use the 1" even thought it will be slightly under scale..
At 70% the span is 35.25" and the area is 265". I know this is pushing the limit of my Norvell .061, but I also have a Norvell .074 for plan B. I will build nose with interchangable mount system for either engine. What is a good target weight for this set-up, I really want it to work with the .061 and not have to go to the .074 ?
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There are 1 1/8 plastic spinners with metal backplate available, maybe from Hobby People. These were a Cox design which Cox did not produce. Maybe someone else can tell you more. I'd say you could go up to 12 oz and still be OK. Lighter is always better with small airplanes.
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There are 1 1/8 plastic spinners with metal backplate available, maybe from Hobby People. These were a Cox design which Cox did not produce. Maybe someone else can tell you more. I'd say you could go up to 12 oz and still be OK. Lighter is always better with small airplanes.
Went to the Hobby People site, did not see any 1 1/8" spinners.
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If you want it to stunt it will need to be 14 oz or less in my experience. You can fly more weight than that with the .061, but not stunt reliably, they tend to get REAL slack on the lines above 30-400 degs. I'd shoot for something under 12 oz
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Try MECOA, they advertise a 1.25" that fits a COX .049. See their ad at http://mecoa.com/cb/spinners.htm
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Try MECOA, they advertise a 1.25" that fits a COX .049. See their ad at http://mecoa.com/cb/spinners.htm
Norvell .061 has a 3mm prop screw, I think Cox uses a 5-40, right ??
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Norvell .061 has a 3mm prop screw, I think Cox uses a 5-40, right ??
Yes. Just a tad bigger at 3.2mm. You can either squint and pretend that 8mil off center isn't a problem, you can wrap the screw with some shim stock, or, well, something.
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Yes. Just a tad bigger at 3.2mm. You can either squint and pretend that 8mil off center isn't a problem, you can wrap the screw with some shim stock, or, well, something.
For me, 8 mill off center at 20K+ is a problem.
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For me, 8 mill off center at 20K+ is a problem.
Picky.
So wrap the screw with the right amount of brass shim stock to bring it up to diameter.
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I have run the Brodak small spinners and they work great. Very good quality and mine ran perfectly true at over 20K.
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Would the 1/2A Nobler be legal for either Classic or N30 ?
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George drew up 1/2A plans in two sizes for his Nobler, Magnum and Agwagon. Several sets were sold at one of George's auctions at a VSC. I don't have copies.
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Would the 1/2A Nobler be legal for either Classic or N30 ?
Hi Allan,
Not so sure that *your* 1/2A Nobler would be technically legal, actually it wouldn't be.. If George drew 1/2A plans, then *those* would be. All depends on how anal the CD/ED (and other competitors) are.
Bill
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I hope the drool doesn't short out my keyboard. WHERE can I lay my hands on the Aldrich plans? I would love to fly legal classic 1/2As (besides my own pitiful Tech Terror).
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From what I understand the Stork is a 1/2 A Nobler. I seen a kit of one by Golden State Models just last weekend in Lansing at the cancelled Tour De Michigan. It was a profile with working flaps. Sure was glad i left the wallet home or it might of follwed me.
Jay
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From what I understand the Stork is a 1/2 A Nobler. I seen a kit of one by Golden State Models just last weekend in Lansing at the cancelled Tour De Michigan. It was a profile with working flaps. Sure was glad i left the wallet home or it might of follwed me.
Jay
Hi Jay!
I have a Spitfire from Golden State Models. It was a companion model to the Stork. There were one or two more.
Bill