help with chosing airfoil section's for wing and tail. 2 meter

[Rcmaster199 at aol.com]

I used Laszlo (Les) on Nat's recommendation and have used no one else  since. 
The best cores in the business without a doubt. My latest taper ratio  BTW,  
flying on Temptress, is nearly 3:1.
 
Also, he is reasonably priced.
 
Mark, Les cut standard exponential curve airfoil cores according  to my 
specs. His CNC cutter has alot of capability so it's just a question  of what you 
want.
 
If a composite hollow wing is what you are after, the husks may be used as  
backing to lay up 1/64" ply into, and finish out in epoxy. Then wax and prep as 
 you would any mold and apply your composite layers. Let cure and voila!!
 
MattK
 
 
In a message dated 11/15/2005 11:24:26 AM Eastern Standard Time,  
natpenton at centurytel.net writes:

The best foam cores in the country can be  acquired from:
 
                        Laszlo Horvath
                        RD 1 Box 844
                       Dingmans  Ferry, Pa  18328
                        Phone 570 - 828 7396
He can cut taper ratios greater than  2/1.         Nat Penton

----- Original Message ----- 
From:  _John Ferrell_ (mailto:johnferrell at earthlink.net)  
To: _discussion at nsrca.org_ (mailto:discussion at nsrca.org)  
Sent: Tuesday, November 15, 2005 8:12  AM
Subject: Re: help with chosing airfoil  section's for wing and tail. 2 meter


I am not familiar with that  airplane.
Building a foam wing strong,stiff and precise  is easy compared to doing the 
same with a built up wing.
 
All pattern birds I am aware of use symmetrical  airfoils as thick as they 
need to be to be strong. dihedral is important.  Leading edge sweep is more 
important than trailing edge sweep. Most  designers like the tips to be 50% of the 
root but this may be influenced by  the difficulty in cutting foam at greater 
than a 2:1 ratio. 
 
The only quality issues that I can think of  that condemn a foam wing core 
are weight poorly formed beads. If you can  build a built up wing, you can fix 
everything else!
 
Each maneuver flown should be considered when  tinkering with wing 
parameters. There are a lot of nice planes that are  tough to snap or spin. 
 
I must have an airplane that helps my  weaknesses!
 
John Ferrell    
_http://DixieNC.US_ (http://dixienc.us/) 


----- Original Message ----- 
From:  _DrMarkMD at aol.com_ (mailto:DrMarkMD at aol.com)  
To: _discussion at nsrca.org_ (mailto:discussion at nsrca.org)  
Sent: Tuesday, November 15, 2005 8:18  AM
Subject: help with chosing airfoil  section's for wing and tail. 2 meter


I was not happy with the cores I got from the  kit I purchased so decided to 
try to build a hollow composite wing for my  Ricochet electric power and 
weighing in at 10.75 lb..   Since I  will be able to now pick the sections. I would 
like to learn from you guys  rather than trial and error.  Would you guys 
mind sharing your  choices and thoughts. 

Mark Lamos
Baltimore  





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