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

Clipped Wing Diamond Dust / OS DF 25

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Old 12-25-2009, 01:03 PM
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Broken Wings
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Default Clipped Wing Diamond Dust / OS DF 25

I found a couple new OS VF DF .25 engines with tuned pipes and thought I would buy one of the Clipped Wing Diamond Dust kits to mount one in.

The engines were mounted but I can find no evidence of them ever being run as the piston and liners show no signs of ever being used.

They both have the 2CB carburetors and DF25 on the rear end of the crankshafts.

I’ve never used a DF engine and could use some instruction on the best way to break them in, propellers, fuel, etc. as well as any help you can give me for setting up the CWDD.

I “think” the pipes are Nelson as I read that the stinger is a little longer than the Macs pipes. They are both 10” long and the stinger is 1.062” long.

The (DDCW) kits are out of stock right now so I’ll have to wait but I’m in no hurry and figured I could bench run them and get to know the engines while I wait.

I’d appreciate any advice…
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Old 12-25-2009, 01:23 PM
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combatpigg
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Default RE: Clipped Wing Diamond Dust / OS DF 25

General rules of thumb....add castor oil to bring the % up to 20% for break in. I would run it with a 7x5 prop for break in. Personally, I believe the engine should be broke in open exhaust [coolest possible configuration] and use a high pressure latex bladder to feed the engine. Once the engine is able to run a 2 oz load with a steady needle, then it is time to play with the pipe.
Get a baseline open exhaust tach reading with a 7x6 and 7x7 prop, then you'll have something to go by when adjusting the tuned pipe length.
If you can get the engine to hit 24,000+ with a 7x6 or 7x7 prop, the DD's speed should be pretty impressive...
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Old 12-25-2009, 01:24 PM
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soarrich
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Default RE: Clipped Wing Diamond Dust / OS DF 25

I have that setup. I don't know if there's much to be gained by clipping the DD wings though.

As for the motor I just ran it like I stoled it from the start.
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Old 12-25-2009, 01:59 PM
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Default RE: Clipped Wing Diamond Dust / OS DF 25

ORIGINAL: soarrich

I have that setup. I don't know if there's much to be gained by clipping the DD wings though.

As for the motor I just ran it like I stoled it from the start.
I just figured the clipped wing kit would be a little smaller for the smaller engine. If you're running the full size version with the .25 I'll buy the full size kit as they are in stock.

I have a couple gallons of Sig Champion All Castor 20% oil, 15% nitro. I'll have to buy a 7x5 prop. APC, Wood, MAS, ? does it matter?

I don't have a bladder tank...
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Old 12-25-2009, 02:21 PM
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Mike Connor
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Default RE: Clipped Wing Diamond Dust / OS DF 25

You might consider the Screamin Demon as it is already smaller then the Dust (32" wingspan) and the wing tips allow you to easily cut a couple more inches off.
http://mikesrc.us/
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Old 12-25-2009, 02:39 PM
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Default RE: Clipped Wing Diamond Dust / OS DF 25


ORIGINAL: soarrich

I have that setup. I don't know if there's much to be gained by clipping the DD wings though.

As for the motor I just ran it like I stoled it from the start.

The clipped wing versions are visibly faster and the roll rate is a lot faster, for a smaller engine I'd defiantly recommend it.
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Old 12-25-2009, 02:40 PM
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Default RE: Clipped Wing Diamond Dust / OS DF 25

I think those are true ABC engines, surprisingly if it was a clean environment, they can be ran 8 or 10 times or more and show no visible signs of use even on the side of the piston and the smut can easily be wiped out of the port early on. At least that's what I've noticed on the the OS 46VXDF engines.

When OS does chrome a sleeve, it's fantastic.

I've not used the 25 so prop and pipe set up I cant help you with. CP's prop ideas are as good as it gets.
It would be best to have some rough idea what the tuned length is and start the break in with the length a bit long and tune later. Hopefully someone will chime in with length.

As for break in, I don't babe them. They are plumed like they will fly. Once it's started, I want to get it up to speed and temperature quickly, wide open rich two stroke (a little crackling). I do this for two tanks and on the third tank I work it down for flight.

As for for break-in fuel, common15 to 30% nitro with 18% oil, but the fuel must contain some castor in its oil package. You can add some extra castor, but I don't anymore. After a gallon or so, I've been running 30% Power master heli fuel because I've got so dang much of it, I don't think it has caster so don't go lean if you try this.

Before I start the break-in, I put one drop of oil in the glow plug hole with the piston near the top pinch and tilt the engine around to coat then bore then draw the piston down. Replace the glow plug. Put a few drops of fuel in the carb to prime, I don't want a lot of cold cranking.
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Old 12-25-2009, 03:11 PM
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Default RE: Clipped Wing Diamond Dust / OS DF 25


ORIGINAL: freakingfast


ORIGINAL: soarrich

I have that setup. I don't know if there's much to be gained by clipping the DD wings though.

As for the motor I just ran it like I stole it from the start.

The clipped wing versions are visibly faster and the roll rate is a lot faster, for a smaller engine I'd defiantly recommend it.
Gee mine roll about 4 times a second, that's fast enough for me.

Smaller planes look faster, so it may be visibly fast without being faster, but I don't know for sure.

The SD looks like a all around improved DD, it would be my choice now.
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Old 12-25-2009, 04:19 PM
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Default RE: Clipped Wing Diamond Dust / OS DF 25

I set up mine with a 6.5x6.5 apc trimmed a 1/4' off tips, almost hits 25000 on the ground with that prop, I've tried a bunch of sizes and that seems to be the best.Full pipe.

http://www.rcuniverse.com/forum/m_9143188/tm.htm
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Old 12-25-2009, 05:26 PM
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Default RE: Clipped Wing Diamond Dust / OS DF 25

That is a real nice model. Would you happen to have another set of scaled down plans?
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Old 12-25-2009, 05:49 PM
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Default RE: Clipped Wing Diamond Dust / OS DF 25

This plane is still a prototype model and I'm not really at liberty to copy them, but I think Mikes'S Rc is thinking about kitting this size out though eventually, I havn't flown it yet or anything because of the winter weather, but it is well proportioned with that size of engine, and looks cool just like the full size SD.
You could probably shrink down the full size DD plans, and try that too.[8D]
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Old 12-25-2009, 05:59 PM
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Default RE: Clipped Wing Diamond Dust / OS DF 25

I just ordered one of Mikes kits for the full size SD. I'll subscibe to your build thread.

Thanks.[sm=thumbup.gif]
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