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

SCREAMIN DEMON Small Block Bash

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Old 10-03-2009, 08:47 AM
  #1  
smoknrv4
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Default SCREAMIN DEMON Small Block Bash

With MJD's permission of course and his down sized plans of the SD I found another use for my OS .25 VFDF, the wing span is 26" , should be fun, I've waiting for a full pipe set-up from MACS, then the fun will start, I'm installing a HOW FAST unit in this one.
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Old 10-03-2009, 09:11 AM
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combatpigg
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Default RE: SCREAMIN DEMON Small Block Bash

It looks like a .90 in a standard size plane [X(]!
I'm willing to guess a 7x7 will be the best prop here.
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Old 10-03-2009, 09:39 AM
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Default RE: SCREAMIN DEMON Small Block Bash

Another one to add to the SD R+D craze.[>:]
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Old 10-03-2009, 10:08 AM
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Mike Connor
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Default RE: SCREAMIN DEMON Small Block Bash

Are those 3/16 or 1/4" balsa ribs laminated with ply in crucial areas? Should be interesting.
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Old 10-03-2009, 10:15 AM
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Default RE: SCREAMIN DEMON Small Block Bash

That's the way I built my first DD, with light 1/4" balsa ribs. The holes for the spars were oversized and packed with sawdust and thin CA.
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Old 10-03-2009, 11:09 AM
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Default RE: SCREAMIN DEMON Small Block Bash


ORIGINAL: Mike Connor

Are those 3/16 or 1/4'' balsa ribs laminated with ply in crucial areas? Should be interesting.
thats 3/16 hard balsa with ply laminated in the crucial spots, up around the engine mount spars etc...
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Old 10-03-2009, 11:34 AM
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Default RE: SCREAMIN DEMON Small Block Bash

Yeehah! Demon parties on the horizon.. new models corkscewing into the frozen tundra at triple digit speeds. Sounds like fun..

MJD
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Old 10-08-2009, 05:15 PM
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Default RE: SCREAMIN DEMON Small Block Bash

Added the how fast tubes, and servos, hatch style, also finished glassing it too in the critical areas. The throttle servo took a little bit of head scratching, I forgot about it and said where am I going to put that, he only place really was in the next rib bay near the front, it 'll work fine.
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Old 10-12-2009, 01:05 PM
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Default RE: SCREAMIN DEMON Small Block Bash

Messin' around today building a cowl for the SD .25VF DF.
Any comments on improvements, or better ideas? Still not sure about the back end of the cowl, I'm waiting for my tuned pipe set-up, to fit.
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Old 10-12-2009, 01:24 PM
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Default RE: SCREAMIN DEMON Small Block Bash

Nice job wrapping that sheet around the front end!
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Old 10-12-2009, 02:20 PM
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MJD
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Default RE: SCREAMIN DEMON Small Block Bash


ORIGINAL: smoknrv4

Messin' around today building a cowl for the SD .25VF DF.
Any comments on improvements, or better ideas? Still not sure about the back end of the cowl, I'm waiting for my tuned pipe set-up, to fit.
Read Ed Smith's comments to Tom about ducting the cooling air. Or if you did, ignore this suggestion.

Here's something I did to the LE of one I am building for lektrik power, and I think this is a mod I may incorporate in the next run of kits. I added 1/16" shear webs to close the box. These are not vertical grain, nor are they intended to do anything much else than preserve the LE profile somewhat better between the ribs, as it tends to alternate between a NACA0006 and a thick flate plate as you move out with high tension coverings. Doesn't seem to be a major problem, but I can't help thinking this is preferable. And I think it looks better. It may add a percent or two of torsional stiffness but that was secondary to me with this one. I've considered widening the LE sheeting a bit and adding fillers like this to see what it does for the structure and flight characteristics, I'll make a prototype out of the next one to hit the bench. Gotta finsh the lekkie then do the Dynajet one. But those are both after the .65 version. So many stupid ideas..

MJD
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Old 10-13-2009, 12:05 AM
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Default RE: SCREAMIN DEMON Small Block Bash

mike

its a great idea, evolving designs are the best!
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Old 11-28-2009, 08:29 PM
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Default RE: SCREAMIN DEMON Small Block Bash

Well just so everybody knows I didn't abandon this project, I was motivated by RVMAN and MJDs' progress on theirs so i started back at er, I had to add about 1/2" to the height
of the cowl to accommodate the fuse top style header, and now I'm covering it, pics to come.
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Old 11-29-2009, 03:27 PM
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Default RE: SCREAMIN DEMON Small Block Bash

Heres some progress this weekend, I just have to finish covering the hatch, and bench run the engine some more.
The pimple on the right side is the "How Fast" LED, highlighted with red covering.
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Old 11-29-2009, 03:41 PM
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Default RE: SCREAMIN DEMON Small Block Bash

Excellent work, bet you look foward to flight testing.

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Old 11-29-2009, 04:49 PM
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Default RE: SCREAMIN DEMON Small Block Bash

Yes, that really looks sharp! I'm amazed by the wood cowl, it wraps around the engine nice and tight.
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Old 11-29-2009, 05:29 PM
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Default RE: SCREAMIN DEMON Small Block Bash

For the cowl I just used some tri-stock and some fibreglass for the fillet transition to the wing, seemed to be smooth enough, I don't expect a 200mph bullet or anything but it would be nice to get it to the 150 + range.
Compact little thing, throw it in the car and go.
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Old 11-29-2009, 07:12 PM
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Default RE: SCREAMIN DEMON Small Block Bash

what method will you use to launch your self?
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Old 11-29-2009, 08:00 PM
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Default RE: SCREAMIN DEMON Small Block Bash

I'm working on a bungee launcher, but I reinforced the centre trailing edge with some fibreglassing, and I can hold the thing there and send it on its way like serving a platter of cookies.
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Old 11-30-2009, 10:05 AM
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Default RE: SCREAMIN DEMON Small Block Bash

what like a skid to hold? U got picture?
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Old 11-30-2009, 11:04 AM
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Default RE: SCREAMIN DEMON Small Block Bash

I think he means he reinforced the trailing edge in the center between the elevons, so it is strong enough to hold onto for a one-handed launch. If you fill in the gap between the elevons with TE stock and glass it around to the TE it makes for a tough handhold, or a good place to hook in to the restraint on the launcher.
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Old 11-30-2009, 04:07 PM
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Default RE: SCREAMIN DEMON Small Block Bash

I not seeing that postion you describe? Overhead launch

You could almost hold engine cowl for underhand launch if near cg?
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Old 11-30-2009, 10:24 PM
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Default RE: SCREAMIN DEMON Small Block Bash

Dude.. picture #4, the gap between the elevons. Hold there, point up, nail throttle, push hard and release. Some do it that way, but puss.. er, others like me insist on someone else launching.

There is usually nothing underneath to grip. The builder can add one if he wants, no problem there. The crankcase barely juts out the bottom, so usually just a bit of fairing is needed.

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Old 12-01-2009, 08:28 PM
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Default RE: SCREAMIN DEMON Small Block Bash

Heres a pic showing hand launch grip.
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Old 12-01-2009, 08:36 PM
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Default RE: SCREAMIN DEMON Small Block Bash

Looks like you have a tiger by the tail...
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