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 31 
 on: Yesterday at 06:50:35 PM 
Started by RC Storick - Last post by wwwarbird
I was wondering if it was spam but apparently Jan is real??

 Looks real to me!  Grin Clown

 32 
 on: Yesterday at 06:44:11 PM 
Started by James Holford - Last post by James Holford
The RSM Distribution web site shows two P40 profile kits. What can I say, I love the look of the P40!

The first profile kit was designed in 1990. At the time I was driving a Le Baron convertible. The back seat of that car was only 47" wide so that left me with a 46" wing span. I wanted to have somewhere around 500 sq. in. of wing area so had to go with a "barn door" wing instead of a dual taper in order to get the area required. The airfoil I chose was the one Tom Warden had in his Crusader. I went with the airfoil because that model continued to glide when the engine shut down plus it flew great.

If you ever observed at a profile from the outside of the circle you too saw the stab tilted. I concluded that the circular pattern exerted a of stresses causing the  fuselage to twist behind the wing. Since built up models did not do this it explained why built ups models flew better than profiles. I thought that if I could stiffen the fuselage I could reduce or eliminate the twisting. That is how the laminated fuselage came about. It worked so well on the P40 Warhawk that I have used this idea on every profile RSM kits.

The combination of the large efficient wing with the laminated fuselage made the 1990 P40 a good flyer with a Fox .35. I used it in numerous contests in Intermediate and my early years in Advanced.

Around 2014 I decided to revisit the P40. I had sold the Le Baron years before and now had a large enough car to allow me to transport a model that incorporated many of the design concepts I had wanted to put into the 1990 model. I used the same Warden airfoil and laminated fuselage because it worked so well. The wing became the dual taper I had wanted to use and grew to 629 sq. in with a larger span. Landing gear went into the wing.

Since I was heavily into laser cutting I decided to make the wing my new "MIT" construction (you have to ask Larry Renger why I call this construction technique the "MIT Wing"- LOL) which incorporates small notches in the ribs at the leading and trailing edges. These notches slide into laser cut slots in the leading and trailing edges and lock the ribs into place. This results in an easy to build wing that is absolutely straight. Stab became a bit larger with more modern numbers and used a 1 degree incidence for solid tracking. The fuselage became three laminations with the center hollowed out for lightness. Hinges became full span and gapless for better efficiency. The power for the new P40 became either a glow .46 or my new RSM 46 electric system.

The newest P40 was designed for top aerobatic performance aimed at the Advanced and Expert flyer.

Neither the original 1990 or the newer 2015 P40 had dihedral as the thrust lines were 0-0-0.

Some folks who mentioned dihedral are confusing the P40s with the P51-D model that Pat Johnston and I designed. The original design featured a wing located at the bottom of the fuselage for a semi-scale look. This low wing made the early P51-D turn tighter outside than inside. When Pat published the P51-D in Stunt News he decided to put some dihedral in the wing in order to move the tips up to the vertical C/G. This worked out well and the modified design turned equally. Rather than make the kit wing more difficult to build by adding dihedral I decided to move it higher in the fuselage.. This upward wing placement accomplished the same thing as the dihedral since it placed the wing tips at the vertical C/G with the result that the inside and outside turn rates were now equal. This modification was made to all of the kits after the first couple of production runs and has stayed that way for the past 14 years.

I hope this history of the two P40 profile models help to clarify the differences in the models.
Appreciate the history on it SmileySmiley

Sent you a pm earlier about the Jig.

Sent from my SAMSUNG-SM-G891A using Tapatalk


 33 
 on: Yesterday at 06:33:10 PM 
Started by James Holford - Last post by eric rule
The RSM Distribution web site shows two P40 profile kits. What can I say, I love the look of the P40!

The first profile kit was designed in 1990. At the time I was driving a Le Baron convertible. The back seat of that car was only 47" wide so that left me with a 46" wing span. I wanted to have somewhere around 500 sq. in. of wing area so had to go with a "barn door" wing instead of a dual taper in order to get the area required. The airfoil I chose was the one Tom Warden had in his Crusader. I went with the airfoil because that model continued to glide when the engine shut down plus it flew great.

If you ever observed at a profile from the outside of the circle you too saw the stab tilted. I concluded that the circular pattern exerted a of stresses causing the  fuselage to twist behind the wing. Since built up models did not do this it explained why built ups models flew better than profiles. I thought that if I could stiffen the fuselage I could reduce or eliminate the twisting. That is how the laminated fuselage came about. It worked so well on the P40 Warhawk that I have used this idea on every profile RSM kits.

The combination of the large efficient wing with the laminated fuselage made the 1990 P40 a good flyer with a Fox .35. I used it in numerous contests in Intermediate and my early years in Advanced.

Around 2014 I decided to revisit the P40. I had sold the Le Baron years before and now had a large enough car to allow me to transport a model that incorporated many of the design concepts I had wanted to put into the 1990 model. I used the same Warden airfoil and laminated fuselage because it worked so well. The wing became the dual taper I had wanted to use and grew to 629 sq. in with a larger span. Landing gear went into the wing.

Since I was heavily into laser cutting I decided to make the wing my new "MIT" construction (you have to ask Larry Renger why I call this construction technique the "MIT Wing"- LOL) which incorporates small notches in the ribs at the leading and trailing edges. These notches slide into laser cut slots in the leading and trailing edges and lock the ribs into place. This results in an easy to build wing that is absolutely straight. Stab became a bit larger with more modern numbers and used a 1 degree incidence for solid tracking. The fuselage became three laminations with the center hollowed out for lightness. Hinges became full span and gapless for better efficiency. The power for the new P40 became either a glow .46 or my new RSM 46 electric system.

The newest P40 was designed for top aerobatic performance aimed at the Advanced and Expert flyer.

Neither the original 1990 or the newer 2015 P40 had dihedral as the thrust lines were 0-0-0.

Some folks who mentioned dihedral are confusing the P40s with the P51-D model that Pat Johnston and I designed. The original design featured a wing located at the bottom of the fuselage for a semi-scale look. This low wing made the early P51-D turn tighter outside than inside. When Pat published the P51-D in Stunt News he decided to put some dihedral in the wing in order to move the tips up to the vertical C/G. This worked out well and the modified design turned equally. Rather than make the kit wing more difficult to build by adding dihedral I decided to move it higher in the fuselage.. This upward wing placement accomplished the same thing as the dihedral since it placed the wing tips at the vertical C/G with the result that the inside and outside turn rates were now equal. This modification was made to all of the kits after the first couple of production runs and has stayed that way for the past 14 years.

I hope this history of the two P40 profile models help to clarify the differences in the models.

 34 
 on: Yesterday at 06:13:14 PM 
Started by James Holford - Last post by James Holford
Would anyone by chance have the plans for a Ringmaster S1 in .PDF format that would be willing to email them to me?

Sent from my SAMSUNG-SM-G891A using Tapatalk


 35 
 on: Yesterday at 05:57:15 PM 
Started by Mike Griffin - Last post by Mike Griffin
I have decided to make most of the kits I have done over the years available as short kits.  I will be listing them all in Vendors Corner in the near future in Griffin's Model Service.

Thank you
Mike

 36 
 on: Yesterday at 05:53:18 PM 
Started by RC Storick - Last post by Jared Hays
I got about 4 email's from Jan today asking about my Cardinal...Could hardly understand them though, must be a foreigner?  Jan sent some pics to me as well but google says the are malicious and won't open them.  I was wondering if it was spam but apparently Jan is real??

 37 
 on: Yesterday at 05:46:43 PM 
Started by Greg Rodney - Last post by Greg Rodney
YEA! Finally got my act together. The WEDELL-WILLIAMS 1/2As are ready to go.
It's in the vendors corner in the SOUTHRIDGE CNC listing.

As soon as I get the 40 incher released I'll try my hand at a 1/2A Gee Bee stunter. Anyone interested?!

Thank you all for the encouraging comments

Greg

 38 
 on: Yesterday at 05:36:55 PM 
Started by Greg Rodney - Last post by Greg Rodney
1/2A WEDELL-WILLIAMS RACER
Designed by Greg Rodney
ENGINE COX .049 PRODUCTION MOTOR*
WINGSPAN  24
LENGTH  15-1/8
WING AREA  125 sq.in.
   Even though the original plane was designed as a Thompson Trophy racer back in 1935, this model was designed with stunting in mind. With the Brodak 2/3 oz. tank specified you should get a consistent 5-1/2 minutes of flight time.
                             FEATURES
FULL SIZE PLANS
STEP BY STEP BUILDING NOTES WITH PHOTOS.
SELECT BALSA
FULL LENGTH SPARS & TRAILING EDGE
FULL LENGTH PRE-SHAPED LEADING EDGE
CNC CUT ONE PIECE FUSELAGE
CNC CUT RIBS
CNC CUT PLYWOOD PARTS                                    
ALL NECESSARY HARDWARE
FORMED WIRE LANDING GEAR

*THIS KIT IS ALSO AVAILABLE IN A BEAM MOUNT CONFIGURATION FOR COX TD, BRODAK, OR NORVEL MOTORS. PLEASE SPECIFY WHEN ORDERING.

Price is $45.00 plus $6.00 Shaking, Manhandling, and Insurance.

I will also be bringing this out as a 40 incher, in January 2017, for the .25 to .35 size motors.

I accept checks, money orders, and PayPal to
southridgecnc@gmail.com

Thanks for looking

Greg Rodney

 39 
 on: Yesterday at 05:12:37 PM 
Started by Fred Quedenfeld jr - Last post by James Mills
Fred,

Sent you a PM for the Europa plans.

James

 40 
 on: Yesterday at 05:05:10 PM 
Started by RC Storick - Last post by James Holford
Haha

Sent from my SAMSUNG-SM-G891A using Tapatalk


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