Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

Woo Hoo!

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Old 08-29-2015, 02:10 PM
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vertical grimmace
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Default Woo Hoo!

I have decided to get back into CL combat. These showed up today, and could not be more impressed! .049 Fora. Not sure what my test run tached, but it was over 30,000 for sure.
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Old 08-29-2015, 10:08 PM
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Did you go with the vendor listing a sub site in California?
I have emailed them twice no response.
Hobby Club / San Clemente, CA 92674


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Old 08-30-2015, 04:22 AM
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I get my Fora stuff from Yaro. The dollar exchange may make up for the shipping. http://aerohobby.ca/store/index.php?...96242e4b763778 He has all the cool F2D stuff, as well as the 80 mph combat planes which are popular here. The .06 is $159 if you are afraid to register.

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Old 08-30-2015, 06:53 PM
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Thank you Alan, I see the 1/2A blue prop but it only lists the dia and not the pitch / D114 mm
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Old 08-30-2015, 07:22 PM
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I went through Yaro. I think the props are geared toward combat. I am gong to guess the pitch is 3. The blue is essentially a 4.5" prop and the green a 5" . So if a FF prop is wanted other sources for props may be sought after. He has the .061 in stock and spares. The special wrench is mandatory, and some extra Nelson plugs would not be a bad idea either.
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Old 08-31-2015, 05:47 AM
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I asked Yaro to bring a couple of the props to the field yesterday, but he injured his eye at work and did not make it. Probably won't see him till Sept or next year. The combat props are normally high revving lower pitch. I checked an F2D prop, and it measured out to 6 1/4 - 5" using my home made Prather type pitch guage.

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Old 08-31-2015, 07:15 AM
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I am not familiar with the .15 engines and what they like. But that size seems about right. I do not have a pitch gauge, otherwise I would measure my props.
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Old 08-31-2015, 09:24 AM
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They are pretty thin blades for a .15. A 7-5" will go around 20,500 rpm in a Fora. With a F2D prop, they go over 30,000. Much thinner. Too thin IMHO for anything but maybe combat. Even my cheapo AP .15 was running 25,000 with one. Sounded nice though.
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Old 08-31-2015, 04:52 PM
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VG.is there a core group of combat flyers in your area...?
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Old 08-31-2015, 05:32 PM
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Originally Posted by combatpigg View Post
VG.is there a core group of combat flyers in your area...?
No, there are not any combat flyers near me. I am getting ready to go to KC as they have a good group there. They fly 75 speed limit and 1/2 A. I am updating my old 1/2 A combat design for these new Fora's, and getting some old foamie Fast models ready for 75 mph. I plan to use my old Foxes choked down to power them. I do not have a lot of interest in FAI. I plan to stick with 75 and 1/2 A for the time being.

The little Fora is very impressive. Can't wait to fly one.
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Old 08-31-2015, 08:23 PM
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I built a 36 inch span "Yuvenko" or "Mejzlik" style plane for a .049 Fora and only flew it for sport. It's built too light to survive abuse [too many bits and pieces and labor], but I like the idea of lots of span to pick off streamers and keep the speed up in the maneuvers.
A hollow core all foam wing with a re-enforced trailing edge and a short leading edge spar to help support the engine mount block is what I visualize to be practical.
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Old 09-01-2015, 12:12 PM
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My 1/2 design was originally 260 sq " , for a Tee Dee or the hotter AME engines at the time. 1996. I am updating the same design, blowing it up to around 330 sq. ". It is a foamy, built in the typical carbon boom style, with the engine mounted, on the L.E. I like a longer tail moment than the Russian designs as they track better and feel better "eyes off" to me. The heavier modern .049 make it easier to have a short nose and get optimum nose/tail moments. I have 3 with spars drying right now, but initial tests are showing it to be a little nose heavy. We shall see once I get the hardware added and such. I may fiberglass the stabilator if I need more tail weight. Once I get this thing all sorted out completely, I want to do a construction article in the AMA mag. The original "Attitudinal" design has done very well in competition. And in keeping with CL history, this bigger badder version is called the "Super Attitudinal".

Glad you chimed in on this Combatpigg This post was meant for you. : )
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Old 09-01-2015, 02:02 PM
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Well I appreciate that VG..! I sure love talking about it, since finding the perfect design is like a surfer looking for that Perfect Wave. I flew some C/L this summer for the first time in a few years. Flying 1/2 A made my shoulder ache..!
I put a weak .049 Stels on extra long mount beams to fly that 36" plane that was designed for the Fora.... https://youtu.be/ZOLrjuK2YL4
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Old 09-01-2015, 02:44 PM
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Looks like a nice flyer with that motor. I have this plane earmarked for the little Fora. Machined up a motor mount already, but have a move and shop to be built this summer.
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Old 09-01-2015, 03:13 PM
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Nice flight! Here is a pic of my .36 Fast design "Nimbus", and the original "Attitudinal". The swept wing allows a longer tail moment. They fly very nice.
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Old 09-01-2015, 08:09 PM
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Those are very slick looking...!
Have you ever propped the .36 for speed to see what I can do..?
Some contests I've heard of had a "speed event" on the side for novelty.
The first photo [without the stabilator] looks nice and compact and fortified. Good for "Last Man Standing" strategy.
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Old 09-01-2015, 08:29 PM
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Combat,

The Nimbus fast design was designed to handle a Nelson .36. I flew those at the 94 Nats. We had a slow version as well with the long fuselage and the suction tanks. At 500' above sea level we got up to 125 mph. Almost too fast really. I live at 5000', so we were around 120 up here. Full on Fast is not flown much anymore. The speed limit events dominate along with FAI. Many are using FAI planes in the speed limit event. The speed limit is either 75 or 80 mph. That is a good speed. I always preffered 80. This opens up a lot of engine possibilities. I am going to start experimenting with .25's. Either the OS .25 FP, or maybe the Magnum XLS .25. The benefit of the FP is it is so light, but can be made very powerful.
Here is where my little Super Attitudinal is right now. The weight of the engine allows a short nose moment (preferred) while still allowing a longer tail (again preferred). My initial balancing tests are very promising. I am hoping to be within a penny or so here. I am doing 3 of these at once preparing for a contest, so hopefully they fly well out of the gate, without much modification.

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Old 09-02-2015, 11:29 AM
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Is that a "foam sandwich" I'm looking at..?
With a slice of mylar for the cheese between 2 slices of styrofoam bread..?
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Old 09-02-2015, 02:40 PM
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Looks like the wing is sitting in the foam blank from which it came.

Not having experienced real 1/2A combat and with a history of flying 1/2A ukies 18-22" span.. I am amazed by the size of the modern combat designs.
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Old 09-02-2015, 03:40 PM
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Originally Posted by MJD View Post
Looks like the wing is sitting in the foam blank from which it came.

Not having experienced real 1/2A combat and with a history of flying 1/2A ukies 18-22" span.. I am amazed by the size of the modern combat designs.

The size is amazing actually. Think about the old popular fast combat models. The Voodoo, 36" span, 360 Sq. in. But, the engines are what are really amazing in my opinion. Over 30,000 rpm and the rules mandate 42' lines. When you see these planes fly, you would swear it was at least a .15, the way they command the circle. Not like a typical wobbly 1/2 A.

You are correct. The plane is sitting on top of the foam shuck. It is just a typical solid foam core wing. 1/4" x 1/8" spar top and bottom.
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Old 09-02-2015, 05:00 PM
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Are there any RTFs being sold for 1/2A....?
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Old 09-02-2015, 05:04 PM
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Originally Posted by combatpigg View Post
Well I appreciate that VG..! I sure love talking about it, since finding the perfect design is like a surfer looking for that Perfect Wave. I flew some C/L this summer for the first time in a few years. Flying 1/2 A made my shoulder ache..!
I put a weak .049 Stels on extra long mount beams to fly that 36" plane that was designed for the Fora.... https://youtu.be/ZOLrjuK2YL4
Looked like you were having to much fun with it.
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Old 09-02-2015, 05:24 PM
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Originally Posted by combatpigg View Post
Are there any RTFs being sold for 1/2A....?

Yes. http://yuvenko-combat.com/index.php?...y&path=119_121
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Old 09-02-2015, 06:04 PM
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I'd like to watch them being assembled, mainly for inspiration...!
Norm McFadden [local legend] was building this style of model several years before the Russian RTFs were common knowledge in the USA. He arranged the ribs in a saw tooth pattern and was the most finicky guy I ever met about dead weight. He fitted his Foxes with titanium prop bolts to save weight and covered each triple tapered wing panel with just 1 overlapping seam to save weight. He weighed his ribs in sets before gluing them in. As far as I know, he flew his same design since before I met him, so he must have flown it for at least 25 years. He also made the backplate mounted, CC pulse triggered pressure regulators. These sold like hot cakes, they were a real advantage.
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Old 09-02-2015, 06:07 PM
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VG your Super Attitudinal looks like it should fly pretty nice. What the heck did you do for a spar it looks fairy substantial?
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