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

VERY FAST MINI DUST!!

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Old 11-18-2005, 09:59 AM
  #1  
paulfrmphoenix
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Default VERY FAST MINI DUST!!

Well, I flew the mini dust today. WOW ,What a little rocket!
It really hauls A..! We think it is around 150 MPH!
The mega motor 16/15/4 really is the way to go for this plane.
On the bench, it tacked a APC 5X5 at 20,750 rpm's, the current draw was 17 Amps. I power it with a thunder power,3-cell 1320 mah LiPo battery, and a castle creations 25 amp controller. it weighs 12 ozs. ready to fly! After the first flight, i landed it, and the motor, BATTERY, & the ESC were absolutely COOL to the touch! This plane is a winner! I'm going to experiment with different props.. Regards, Paul
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Old 11-18-2005, 12:06 PM
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daven
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Default RE: VERY FAST MINI DUST!!

Looks like fun, I should finsish mine.
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Old 11-18-2005, 12:35 PM
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Default RE: VERY FAST MINI DUST!!

ORIGINAL: paulfrmphoenix

Well, I flew the mini dust today. WOW ,What a little rocket!
It really hauls A..! We think it is around 150 MPH!
The mega motor 16/15/4 really is the way to go for this plane.
On the bench, it tacked a APC 5X5 at 20,750 rpm's...
I'm not trying to be critical, but 150? Without accounting for slippage I think you'd need to turn a 5 inch prop at around 32,000 RPMs to get that speed. Here's the numbers I used:
20750 rev/min x 5 inches/revolution = 103750 inches/minute
103750 in/min / 12 inches/ft = 8646 ft/min
8646 ft/min / 5280 ft/mile = 1.637 miles/minute
1.637 mi/min * 60 min/hr = 98.2 mi/hr
Sound right?

Edit: I am in no way trying to make your plane sound slow. That's quick for a small plane. These speeds on a small plane just seem way faster than we think.
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Old 11-18-2005, 03:41 PM
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Default RE: VERY FAST MINI DUST!!

DAVE finnish it! You'll love it! Paul

CHUCK Thanks for the Numbers! You are probably right, it seems faster than it probably is, but what about when it gets up to speed, it certainly is going to have more RPM's when the prop "unloads". Won't this change the figures ? I guess the only way to really see what it is doing, is to clock it with a radar gun.
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Old 11-18-2005, 05:32 PM
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Default RE: VERY FAST MINI DUST!!

Yes, when the plane gets up to speed, the prop will certainly be turning more RPMs. However, the part I didn't include when I did the numbers is that there is some slipage of the prop. Due to drag, a 5 inch pitch prop will not actually travel 5 inches forward for each revolution. The 98 MPH above assumes no drag, which is not going to happen. I don't remember the typical percentage for drag and didn't think it mattered much for this discussion. Yup, you need to get a radar gun. I know I'd like to put one on my Shrike, the engine turns between 18 and 19k with a 7x8 prop. I know it's fast, but I'm curious just how fast.
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Old 11-18-2005, 05:48 PM
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Mike Connor
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Default RE: VERY FAST MINI DUST!!

I have seen too much proof from expert sources that says a plane can fly much faster then the Theoretical speed. Maybe not 150 mph but you may be well over 100 mph. Get it on radar so we know for sure. I like your plane but I am partial to any Dust
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Old 11-18-2005, 06:56 PM
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Default RE: VERY FAST MINI DUST!!

Chuck & Mike
Thanks for your comments! I flew a shrike with a Norvel 15, and it was fast, and a great plane!, but NOWHERE near the speed that the dust is...I think the airfoil is too thick compared to the dust, and it just can't obtain the speeds the dust can..My big dust, I had years ago, had a NELSON Q40 engine on it, Talk about FAST WHEW!! All I could do to keep it in sight! I'm too old now for that kind of brute horsepower! Reflexes are not what they used to be... Going to experiment with some different props, I have an APC4.75x4.75 ,5.25x4.75, 5.5x4.5, & 6x4....I have no idea how they will do, but i will find out tomorrow!
Regards,Paul
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Old 11-18-2005, 07:25 PM
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Default RE: VERY FAST MINI DUST!!

Chuck,
Heh-heh! There will be NO more guessing on speed! I just ordered a bushnell radar gun!
Great price on it..$79.99 with shipping!.Paul
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Old 11-18-2005, 08:58 PM
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Default RE: VERY FAST MINI DUST!!

Cool! Fly out here with it sometime so you can measure my Shrike.
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Old 11-18-2005, 10:02 PM
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Default RE: VERY FAST MINI DUST!!

Great job Paul, was that you own design or where did you get it. I own a full size DD and and slowing gettng rid of all of my nitro planes and going all electric.
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Old 11-18-2005, 10:05 PM
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Default RE: VERY FAST MINI DUST!!

I think it went 150mph![sm=confused.gif]

Well maybe 130mph![sm=confused.gif]

I know for sure it went over 100mph![sm=confused.gif]

Without a doubt we all were convinced it was way over 90mph![sm=confused.gif]

Who cares how fast it really went!

If you were enjoying every second of your "150mph" while flying your new plane power to you brother because that is all that really matters in this hobby of ours!

What brand of kit, engine and radio is in last place in my book!

Just ask yourself if you enjoyed your day of flying and say to yourself can't wait until tommorrow!

Cheers,[sm=RAINFRO.gif] Rev Bro #118

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Old 11-18-2005, 10:18 PM
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Default RE: VERY FAST MINI DUST!!

Chuck! TOO cold in your neck of the woos for me...LOL YOU come out here in our glorius weather!
heh-heh......Paul
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Old 11-18-2005, 10:32 PM
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Default RE: VERY FAST MINI DUST!!

MLo126 you can get the plans from wingerr@shaw.ca
Yeah, I am only into electrics now ,myself..good luck
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Old 11-18-2005, 10:39 PM
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Default RE: VERY FAST MINI DUST!!

SPEED JUNKIE..YOU just said it all!!LOL
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Old 11-18-2005, 11:14 PM
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Default RE: VERY FAST MINI DUST!!

SWEET![sm=thumbup.gif]

REV BRO #118 [sm=RAINFRO.gif]
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Old 11-18-2005, 11:30 PM
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Default RE: VERY FAST MINI DUST!!

I have one with 1/2A glow power that has "seen 90", but electric would be a great alternative, just for less vibration. The flimsy engine mount plywood allows a high revving engine too much freedom to oscillate and rpm is actually lost as a result. Quick little plane, and easy to fly. The glow version weighs about 10 ozs, RTF.
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Old 11-18-2005, 11:47 PM
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paulfrmphoenix
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Default RE: VERY FAST MINI DUST!!

combatpigg, yeah, i think the electrics are really up "there" now, with the technology..In my opinion, they are faster than the fuel version .049&.061's.. I know, you can crank near 30K's out of a fuel engine, but the electrics are *****g out at 55k, so I hear.........and like you said, little vibration!............Paul
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Old 11-19-2005, 12:42 AM
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Default RE: VERY FAST MINI DUST!!

What keeps me away from electric is a little bit of ignorance and a little bit of reluctance to take the monetary plunge. I figure $500 to get a couple good motors, batteries, chargers, etc. I could get a couple of CYCLONS for that much, and a case of good beer! Those little 3D set ups are too much to believe, and the electric speed applications are awesome. I guess the hardcore electric speed demon rewinds, times and machines his own motors too?
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Old 11-19-2005, 07:32 PM
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paulfrmphoenix
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Default RE: VERY FAST MINI DUST!!

combatpigg
you just have to bite the bullet, and go for it! If Columbus wouldn't have taken that first step, we may never have had the opportunity to reply here! , you'll love the lectrics! And NO (UGH) oil to wipe of of them! LOL!
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Old 11-19-2005, 11:28 PM
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Default RE: VERY FAST MINI DUST!!

UMMMM.... CYCLONS and beer.......good combo. I'm with you PFP, good advice for anyone just getting started into performance aircraft would be to go electric. Watching an electric foamie go into a vertical dive, almost hit the floor, then put it into reverse, made a huge impact on me![X(] A local flyer can put his little FORMOSA foamie into a TOC level routine with, just mind blowing!
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