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

Ooh, this looks interesting

Reply

Old 07-22-2008, 05:39 PM
  #1  
MJD
Thread Starter
My Feedback: (1)
 
MJD's Avatar
 
Join Date: May 2003
Location: Orangeville, ON, CANADA
Posts: 8,629
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Ooh, this looks interesting

It is hard to tell from the pictures on these sites, but it looks to have only a moderately thick airfoil - maybe 12%? - and I like the planform. I wonder if a pair of Sport Jett .50's would qualify it for this forum, or would it need more power (what doesn't)?

[link]http://www.brcdesign.com/lcrc/mm2008-print1.pdf[/link]

[link]http://www.ripmax.com/Instructions/harmony.pdf[/link]

MJD

p.s. let me guess, this has already come up?...
Attached Thumbnails Click image for larger version

Name:	Bz78202.jpg
Views:	6
Size:	28.0 KB
ID:	995751  
MJD is offline  
Reply With Quote
Old 07-22-2008, 08:34 PM
  #2  
rmenke
Senior Member
My Feedback: (13)
 
Join Date: Jun 2004
Location: Merced, Ca., CA
Posts: 2,118
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Ooh, this looks interesting

MJD:

Twin 50 LX engines should make this thing scoot if not tooo draggy. Naturally two 60LX's would be a tad better in MHO, they are same size and approx. weight. Regardless be sure you get the LX model of either, its good for another 1500 rpm or so. ENJOY PS: A 12% wing is very thin compaired to the usual 18% or so.
rmenke is offline  
Reply With Quote
Old 07-22-2008, 09:08 PM
  #3  
k8svrick
 
Join Date: Mar 2007
Location: Columbus, OH
Posts: 177
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Ooh, this looks interesting


ORIGINAL: MJD

It is hard to tell from the pictures on these sites, but it looks to have only a moderately thick airfoil - maybe 12%? - and I like the planform. I wonder if a pair of Sport Jett .50's would qualify it for this forum, or would it need more power (what doesn't)?

[link]http://www.brcdesign.com/lcrc/mm2008-print1.pdf[/link]

[link]http://www.ripmax.com/Instructions/harmony.pdf[/link]

MJD

p.s. let me guess, this has already come up?...
Doesn't look like a jet to me.
k8svrick is offline  
Reply With Quote
Old 07-22-2008, 09:12 PM
  #4  
evan-RCU
Senior Member
 
evan-RCU's Avatar
 
Join Date: Feb 2002
Location: Charlotte, NC
Posts: 3,911
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Ooh, this looks interesting

Jett is a brand of piston engines....
evan-RCU is offline  
Reply With Quote
Old 07-22-2008, 09:33 PM
  #5  
SpeedBoy
Senior Member
 
SpeedBoy's Avatar
 
Join Date: Nov 2007
Location: Monterrey, MEXICO
Posts: 461
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Ooh, this looks interesting

Sorry for my question guys but ..... how do you get the % of the airfoil ???

The airplane looks like an Ultra Sport twin to me
SpeedBoy is offline  
Reply With Quote
Old 07-22-2008, 10:13 PM
  #6  
Mike Connor
Senior Member
My Feedback: (5)
 
Mike Connor's Avatar
 
Join Date: Jan 2002
Location: Tulsa, OK
Posts: 2,025
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Ooh, this looks interesting


ORIGINAL: SpeedBoy

Sorry for my question guys but ..... how do you get the % of the airfoil ???

The airplane looks like an Ultra Sport twin to me
12% was a guess. I would guess 15-20%. I would also think a duellist would be a better choice for speed.
Mike Connor is offline  
Reply With Quote
Old 07-22-2008, 10:35 PM
  #7  
MJD
Thread Starter
My Feedback: (1)
 
MJD's Avatar
 
Join Date: May 2003
Location: Orangeville, ON, CANADA
Posts: 8,629
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Ooh, this looks interesting

ORIGINAL: Mike Connor


ORIGINAL: SpeedBoy

Sorry for my question guys but ..... how do you get the % of the airfoil ???

The airplane looks like an Ultra Sport twin to me
12% was a guess. I would guess 15-20%. I would also think a duellist would be a better choice for speed.
I have a Duellist 2/60 kit, I dunno if it looks any thinner in the wing than this does. I'll take another peek. But the thing here is that this is an ARF - a strong point for lazy sods like me!

All the wing root pictures are at an angle, so I was of course guessing at the thickness. It looked like either a thicker symmetrical or medium thick "semi" symmetrical, but the resolution wasn't good enough. Or my eyesight, which is more likely the case.

MJD

EDIT: p.s. plus, the color scheme is pretty snazzy, even to a Canuck. Gee, [sm=bananahead.gif] I wonder to which major RC product consuming nation the color scheme was designed to appeal?




MJD is offline  
Reply With Quote
Old 07-22-2008, 11:38 PM
  #8  
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: Ooh, this looks interesting

SpeedBoy, a wing with a 10 inch chord and 2 inch thickness would have a 20% thick airfoil. The fastest models that I've paid attention to have 8% airfoils.
The payback in speed with twins just isn't there. I think the best application for twins in models is simple fun.
combatpigg is offline  
Reply With Quote
Old 07-22-2008, 11:43 PM
  #9  
SpeedBoy
Senior Member
 
SpeedBoy's Avatar
 
Join Date: Nov 2007
Location: Monterrey, MEXICO
Posts: 461
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Ooh, this looks interesting

Uhmm ....... okey I notice it was a guess hehe but we suppose that we have the wing in our hands , what measured we need to take to get the % ??? for example in this case MJD is talking from a 12 % and Mike about 15-20% that percentage from what ???.

I'm trying to figure out what % does have draggy Airplanes like Patriot and Shrike .

Thanks for the previous answer Mike and MJD .

edit ... upsss , when I was writing , you were been answering me combatpigg , thanks for your answer
SpeedBoy is offline  
Reply With Quote
Old 07-23-2008, 12:12 AM
  #10  
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: Ooh, this looks interesting

You are welcome SpeedBoy.
I think alot of manufactured "fast" models go with thicker airfoils for structural reasons. It takes more work to make a thin wing as strong as a thicker wing.
combatpigg is offline  
Reply With Quote
Old 07-23-2008, 05:22 AM
  #11  
k8svrick
 
Join Date: Mar 2007
Location: Columbus, OH
Posts: 177
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Ooh, this looks interesting


ORIGINAL: evan-RCU

Jett is a brand of piston engines....
I am aware of that. I meant the airplane doesn't look like a jet.
k8svrick is offline  
Reply With Quote
Old 07-23-2008, 07:48 AM
  #12  
MJD
Thread Starter
My Feedback: (1)
 
MJD's Avatar
 
Join Date: May 2003
Location: Orangeville, ON, CANADA
Posts: 8,629
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Ooh, this looks interesting


ORIGINAL: combatpigg
The payback in speed with twins just isn't there. I think the best application for twins in models is simple fun.
Quite true! I don't think for a minute this is a contender in the world of RC speed. Rather, it's just a snazzly looking twin that could probably be coaxed to move along with excess power. And it's an ARF..

Now, tandem engine arrangements on the other hand.. hmm.
MJD is offline  
Reply With Quote
Old 07-23-2008, 08:25 AM
  #13  
k8svrick
 
Join Date: Mar 2007
Location: Columbus, OH
Posts: 177
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Ooh, this looks interesting


ORIGINAL: MJD


ORIGINAL: combatpigg
The payback in speed with twins just isn't there. I think the best application for twins in models is simple fun.
Quite true! I don't think for a minute this is a contender in the world of RC speed. Rather, it's just a snazzly looking twin that could probably be coaxed to move along with excess power. And it's an ARF..

Now, tandem engine arrangements on the other hand.. hmm.
It's a lot of fun until someone loses an engine. That said, a couple of properly tuned and operated engines will mitigate the likelihood.
k8svrick is offline  
Reply With Quote
Old 07-23-2008, 10:54 AM
  #14  
bob27s
My Feedback: (19)
 
bob27s's Avatar
 
Join Date: Apr 2002
Location: Cleveland, OH
Posts: 5,576
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Ooh, this looks interesting

Does indeed look like a twin UltraSport 60 ...

Should fly well
bob27s 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