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

Scream Machine Scratch Build

Reply

Old 05-02-2011, 09:33 AM
  #1  
bkg1956
Member
Thread Starter
 
Join Date: May 2008
Location: Apopka, FL
Posts: 74
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Scream Machine Scratch Build

Thought I'd post some pics of my Scream Machine scratch build. My first ever scratch build. Done kits, ARF's (i know, they don't count!), but never a real scratch build.

The interesting thing is that there are no drawn plans. You build a Scream Machine from a flat surface, preferably glass, tape down the bottom of the fuse, draw a center line, and lay out from firewall to tail. Sides go on next, then top. Wing is build on simple measurements to a total wingspan of 44". I do have the advantage of having Roger Purcell's templates in my possession, so cutting out parts wasn't difficult, but it was time-consuming. Ribs would be most difficult, but Roger had some ribs he'd had cut some years ago!

Don't have photos of the complete build. Hindsight is 20/20. Next one will be thoroughly documented. However, by the limited photos I have you can see the characteristics of the design.

Hope you enjoy seeing these.

Hope also my choice of color doesn't blind you. Sunglasses optional!!
Attached Thumbnails Click image for larger version

Name:	yw67966.jpg
Views:	5
Size:	20.3 KB
ID:	1603036   Click image for larger version

Name:	nj25717.jpg
Views:	3
Size:	19.2 KB
ID:	1603037   Click image for larger version

Name:	wb77111.jpg
Views:	4
Size:	20.0 KB
ID:	1603038   Click image for larger version

Name:	ey69994.jpg
Views:	5
Size:	23.6 KB
ID:	1603039   Click image for larger version

Name:	rd42399.jpg
Views:	5
Size:	21.2 KB
ID:	1603040   Click image for larger version

Name:	of59365.jpg
Views:	5
Size:	21.3 KB
ID:	1603041   Click image for larger version

Name:	pr26767.jpg
Views:	7
Size:	22.4 KB
ID:	1603042   Click image for larger version

Name:	pn47284.jpg
Views:	6
Size:	28.0 KB
ID:	1603043  

Click image for larger version

Name:	xv34468.jpg
Views:	3
Size:	30.3 KB
ID:	1603044   Click image for larger version

Name:	gs85542.jpg
Views:	6
Size:	30.0 KB
ID:	1603045   Click image for larger version

Name:	io65012.jpg
Views:	4
Size:	31.1 KB
ID:	1603046   Click image for larger version

Name:	al51204.jpg
Views:	3
Size:	26.5 KB
ID:	1603047  
bkg1956 is offline  
Reply With Quote
Old 05-02-2011, 09:34 AM
  #2  
bkg1956
Member
Thread Starter
 
Join Date: May 2008
Location: Apopka, FL
Posts: 74
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Scream Machine Scratch Build

A few more pics.
Attached Thumbnails Click image for larger version

Name:	xv63206.jpg
Views:	5
Size:	24.7 KB
ID:	1603048   Click image for larger version

Name:	to43392.jpg
Views:	4
Size:	38.3 KB
ID:	1603049   Click image for larger version

Name:	yd83304.jpg
Views:	3
Size:	38.0 KB
ID:	1603050   Click image for larger version

Name:	gz76187.jpg
Views:	3
Size:	30.4 KB
ID:	1603051   Click image for larger version

Name:	jv14941.jpg
Views:	2
Size:	39.4 KB
ID:	1603052   Click image for larger version

Name:	pg62060.jpg
Views:	3
Size:	38.5 KB
ID:	1603053  
bkg1956 is offline  
Reply With Quote
Old 05-02-2011, 09:47 AM
  #3  
bkg1956
Member
Thread Starter
 
Join Date: May 2008
Location: Apopka, FL
Posts: 74
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Scream Machine Scratch Build

Currently going to run an OS .46FX I had on the shelf. Strong motor. Either a tuned pipe or Macs black pipe for now. (Will eventually get a Jett .50 BSE when the bank says I can!) Single aileron servo with Gold-N-Rod running from aileron surface to aileron surface intersecting the servo in the center of the wing. Roger used a bell crank at each servo but the hardware for such a set-up wasn't readily available. No problem as this set-up is secure, smooth, and strong. No flex whatsoever!

If this flies like my other two Scream Machines, which Roger Purcell built himself, it's gonna be a fast blast! Blinding spins, tight symmetrical loops inside and out, "Death Dives", flat sliding circles, knife-edge loops, horseshoe turns, inverted high speed low passes, inverted landing approaches rolling out just prior to touchdown. Flies extremely well in high winds, and lands like a dream even in high winds!!

My flying buddies like to count how many full throttle flat spins I can get in from high altitude. Spins so fast they lose count! This plane can take it all!
bkg1956 is offline  
Reply With Quote
Old 05-02-2011, 01:01 PM
  #4  
Pylonracr
 
Pylonracr's Avatar
 
Join Date: Apr 2011
Location: Reno, NV
Posts: 846
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Scream Machine Scratch Build

How can you scratch build if there are no plans??? Are there templates or part outlines available? The only reason I ask is that I would like to build one, scratch building is one of my winter activities.

Any info you can give me will be appreciated.
Pylonracr is offline  
Reply With Quote
Old 05-02-2011, 02:07 PM
  #5  
bkg1956
Member
Thread Starter
 
Join Date: May 2008
Location: Apopka, FL
Posts: 74
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Scream Machine Scratch Build

Yes. As I mentioned in the opening post I have the designer's templates. What I meant about plans is that you don't need them for any layout work. I have Roger's hand written build notes so I have the dimensions and distances.
bkg1956 is offline  
Reply With Quote
Old 05-02-2011, 02:50 PM
  #6  
combatpigg
Senior Member
My Feedback: (3)
 
combatpigg's Avatar
 
Join Date: Nov 2003
Location: arlington, WA
Posts: 19,891
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Scream Machine Scratch Build

It looks like a great "GO-TO" plane for all around fun. Nice job on it...!
combatpigg is offline  
Reply With Quote
Old 05-02-2011, 05:03 PM
  #7  
bkg1956
Member
Thread Starter
 
Join Date: May 2008
Location: Apopka, FL
Posts: 74
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Scream Machine Scratch Build

Thanks! Fun, fear...it's all of that and more!
bkg1956 is offline  
Reply With Quote
Old 05-02-2011, 05:34 PM
  #8  
still4given
 
still4given's Avatar
 
Join Date: Jan 2006
Location: Victorville, CA
Posts: 1,582
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Scream Machine Scratch Build

Looks like some pretty big flippers for a speed plane. No flutter?
still4given is offline  
Reply With Quote
Old 05-02-2011, 07:38 PM
  #9  
bkg1956
Member
Thread Starter
 
Join Date: May 2008
Location: Apopka, FL
Posts: 74
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Scream Machine Scratch Build

You'd think! However, this is my third (pics of one and two on the thread "Roger Purcell's Scream Machine") and there is absolutely no flutter in this design. Ailerons are 1 1/2x12", and elevator is 1 1/2x12". I believe the secret is very tight linkages and close, generous hinging. Radio South hinges all around. Never had these radar-tested, but they are FAST!! Not pylon racers, but with my Jett .50 BSE it absolutely screams!
bkg1956 is offline  
Reply With Quote
Old 05-05-2011, 01:31 PM
  #10  
Pylonracr
 
Pylonracr's Avatar
 
Join Date: Apr 2011
Location: Reno, NV
Posts: 846
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Scream Machine Scratch Build

Is there a way I can buy a set of templates or plans?? I would really like to build one of these.

Thanks
Scott
Pylonracr is offline  
Reply With Quote
Old 05-05-2011, 01:39 PM
  #11  
bkg1956
Member
Thread Starter
 
Join Date: May 2008
Location: Apopka, FL
Posts: 74
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Scream Machine Scratch Build

I'm at the field flying her as I write this! Roger Purcell came out and watched a while this afternoon. Upgraded to an OS .55/tuned pipe. It's windy, 15 mph. No problem!! All I can say is...WOW!! Loops are correction-free. Even in the wind!!

Scott, l'll PM you tonight if that's ok! Now that I've built one I think I can answer any questions and I'm preparing building instructions from Roger's original hand-written notes. Glad you're interested!
bkg1956 is offline  
Reply With Quote
Old 05-05-2011, 01:40 PM
  #12  
Pylonracr
 
Pylonracr's Avatar
 
Join Date: Apr 2011
Location: Reno, NV
Posts: 846
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Scream Machine Scratch Build

Thanks, I Shall be waiting.
Pylonracr is offline  
Reply With Quote
Old 05-31-2011, 05:14 PM
  #13  
bkg1956
Member
Thread Starter
 
Join Date: May 2008
Location: Apopka, FL
Posts: 74
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Scream Machine Scratch Build

Check out my video of the Scream Machine flying Memorial weekend. Winds a constant 15-20+ mph!! Videoed using an iPhone by "The Boy" (my daughter's boyfriend). He had never filmed anything flying before, so he did a great job considering the circumstances.

At times it was like flying a kite, the wind was so strong. At one point you can hear me say, "Wow! This wind is crazy!" 'Cuz it was crazy!!

Full speed inside and outside snaps, Lomcevaks, high speed rolls, loops, inverted, the infamous "Death Dive," most all done at full throttle. The plane takes a licking and keeps on ticking!!

Let me know what you think! Enjoy.

http://www.youtube.com/watch?v=_C3Rgk7zeuM
bkg1956 is offline  
Reply With Quote
Old 05-31-2011, 05:29 PM
  #14  
bkg1956
Member
Thread Starter
 
Join Date: May 2008
Location: Apopka, FL
Posts: 74
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Scream Machine Scratch Build

By the way, the engine I ended up using was NOT the OS.46FX, but an OS .55AX with a 7.5cc tuned pipe set up according to Don Muddiman's recommendations. I love my Jett .50 BSE on my other Scream Machine, but the OS is hard to beat with this set up. Idles wonderfully, no mid range problems, and yet loves to be on the pipe! LOVE the sound it makes, both mid range and full throttle. Using a McCoy MC-59 glow plug with Powermaster 15% fuel. Awesome combination.
bkg1956 is offline  
Reply With Quote
Old 05-31-2011, 08:22 PM
  #15  
Pylonracr
 
Pylonracr's Avatar
 
Join Date: Apr 2011
Location: Reno, NV
Posts: 846
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Scream Machine Scratch Build

Cool flight video. Now that it flies, is there an eta on the templates? I want one even more now that Ihave seen it fly.
Pylonracr is offline  
Reply With Quote

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service