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

Norvel .061 Delta flies great!

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Old 10-28-2002, 05:44 PM
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wingspan99
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Default Norvel .061 Delta flies great!

I bought an unknown type of delta at a swap meet last year and finally got around to flying it. I put a Norvel AME .061 CL engine on it with two Pico servos, a GWS Pico reciever, and 300mah Nimh pack. The fuel tank is a syringe with the plunger handle removed so it's about .5 to .75 ounces. All up weight is 8oz. Wingspan is 22", length 14.5". This little thing really moves out. It takes off from my hand like it was shot out of a slingshot and rolls about 5 times per second on high rate. It rolls way too fast to follow the rolls, but it is really fun. I used 60% expo on all rates. Most guys think it's probably doing over 100mph but at it's small size it looks even faster than that. I am running a 5.5 x 4 MA prop and 15% nitro but I don't know my RPM. I guess about 18K.
-Tom
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Old 10-28-2002, 09:21 PM
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Default 100 mph?

You need 28,000 rpm to get 100 mph. I suspect your getting about 60. Race a trainer and find out.
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Old 10-29-2002, 12:11 AM
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Default Norvel .061 Delta flies great!

I bet that little thing is a blast to fly
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Old 10-29-2002, 12:25 AM
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Default Prop pitch speed

OK I came up with 68mph of prop pitch speed so you're right, it's probably about 60mph. It sure seemed a lot faster than that. I was doing laps around the fastest thing out there, a combat ship, a Floyd with an OS25LA and 10x4 prop. Now what this means is that just about everything else is going a LOT slower than everyone thinks. Maybe this was hitting 75mph in long split S?
I know I was outrunning the prop on several long dives.
You know, this is why I log on to RCUniverse, because I learn so much. I think I'm going to make a Prop Pitch Speed spreadsheet to bring to the field next week. -Tom
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Old 10-29-2002, 12:29 AM
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Default It's a lot of fun

FlooredCOBRA it is a lot of fun. Sometimes when I launch it sags a little bit and flies a half-lap, and when the engine comes on it is flying horizontal at about 20' high. It looks like the afterburner came on or something, within a few plane lengths it just shoots up to it's 60mph. It's like a missile on the controls. -Tom
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Old 10-29-2002, 12:45 AM
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Default Norvel .061 Delta flies great!

i bet it does. Being it is so small it probably looks like shooting a BB into a small metal box zooming around all over the place.

Nice plane!
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Old 10-29-2002, 12:56 AM
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Default Thanks!

It turned out a lot better than I thought it would. The Pico servos are precise and fast at .12sec/60deg. I'm going to try and get a tach reading on that Norvel tomorrow. Now I'm real curious to see how fast I can get that thing. I have some pure nitro and oil, I could make some 40% fuel, and I think APC makes a 5x5 prop. Maybe I could reach that 100mph after all. I would need 22K rpm with that prop which is supposedly within the specs for that engine. Now I want to make a bladder tank from a balloon. Anyone have experience with that? -Tom
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Old 10-29-2002, 01:00 AM
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Default Norvel .061 Delta flies great!

I know a guy at our club uses a bladder for fuel tank. He used surgical tubing with one end rolled up. Well at least that what it looks like. Then he fills it up and the tubing inflates and he goes from there. I'll take the digital cam out this weekend and get a few pics if you like.
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Old 10-29-2002, 01:09 AM
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Default Yes please!

I have been thinking about a bladder tank for this plane, I don't want it to get lean in the dives. -Tom
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Old 10-29-2002, 02:01 AM
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Default Norvel .061 Delta flies great!

will do
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Old 10-29-2002, 02:57 AM
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Default Little Detlas

They are fun. This is a 1/2 A Dust
Old race preped TD 51 on 50%N
HS60s laid down
TW 7oz
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Old 10-29-2002, 03:21 AM
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Default plane speeds

Its fun to see how fast the planes go. I take the radar gun out and clock people flying and landing alot. I can even get them going vertical. I want to clock this guy with an electric that he dives down at the field from several hundred feet and looks like 150 mph.
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Old 10-29-2002, 04:19 AM
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Default Cool 1/2A Dust!

These little deltas are cool. I had mine way down on the deck Sunday. Me and the combat plane were flying side by side down the runway about a foot high. It was a blast. I was about 4' high off the weeds making huge circles way out there playing chicken with the ground and the treeline. I put together a PropPitchSpeed spreadsheet, and it was surprising to me that most planes aren't going nearly as fast as I thought, and 150mph is not as easy to achieve as it sounds. A few years ago I had a Holy Smoke with YS 45 and pipe turning a 9x8 APC at 16k and I thought that was going 150mph but prop pitch speed is only 121mph. I might get a radar gun, it would be fun. It's hard to gauge how fast these models are going, we're used to looking at car speeds on the highways, and they don't cover their own lengths as quickly. Now I want a DD with Dubb Jet 50RE and pipe. Is that the fastest combo around?
-Tom
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Old 10-29-2002, 04:55 AM
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Default best combo

So far we have yet to see anyone with a jett fire 50 post measured speeds here. The best bet for the money right now is the os 46fx/pipe. 90 dollar engine. Posted speed 146mph and holding up fine after many flights. My nelson cost 6x as much and only gets 10% more speed. These are using whiplash. Take 10% off for DD.
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Old 10-29-2002, 05:28 AM
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Default Norvel .061 Delta flies great!

I have to agree about the OS 46 FX set up on a DD. The engine is cheap yet runs like a bandit. It is very easy to tune and never really gives you a hassle, always runs right. I ran mine with a apc 9 x 7 and it launched out my hand like it was in a hurry. And top end I have no idea what it was but it was very satisfying.
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Old 10-29-2002, 12:43 PM
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Default OS 46FX with Mac's muffler?

What about the Mac's mufflers, the short fat pipe/mufflers that bolt directly to the engine? I have one of these on an OS46FX on a Force One with 10x6 APC pusher prop. (I'd like to use a smaller prop but there's not much available in pushers.) How do these mufflers compare to a full length pipe or a mousse can pipe? The Force One has a camera mounted in a rotatable turret up front on top that can go 180deg front to back on a servo. I haven't flown this airplane yet. I've been waiting for the fall colors to arrive and now they are here. Hopefully I'll get some hot video. I want to get the vertical rolls out of sight with the camera pointed backwards. -Tom
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Old 10-29-2002, 01:07 PM
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Default prop size

Cut the prop you have. Taking a little off the tips can make a big difference. If its wood use thin CA when your done balancing. If its plastic or carbon fiber then your done. You can shape the tips anyway you want too. Look at some of the high performance props and copy them.
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Old 10-29-2002, 01:58 PM
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Default Grish 9x6 3-blade

I have a 9x6 Grish three blade pusher do you think it would run any faster? I will try to post a pic of the Force One today. I've got a mousse can pipe to try on it too. If APC made a 9x6 pusher 2-blade would that be any better? -Tom
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Old 10-29-2002, 02:13 PM
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Default props

Go to apc.com . They make a 9x6,10x6,10x7,10x8 pushers. I would take the 10x7 and cut it to 9x7. This seems to be the best prop for this engine for best performance. For now trim down the 10x6 to get more rpms.
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