*** rcFoamFighters FF-VIPER-50 ***
Model Name: FF-VIPER-50
Plan Design By: Paul Petty (Feb. 2018)
Description: Original Foamboard RC Model Airplane created by Paul Petty. The FF-VIPER-50 is a 50mm EDF Jet. The plane features a KFm2 Airfoil main wing, 3D shaped fuselage and straight vertical stabilizers. Also features dual air intake ducts, One large one on the Bottom and another one just aft of the fuselage on the top side. The plane features basic Delta style Mixed Aileron & Elevator control surfaces for “Bank and Hank” type flying. Recommended all hobbyists with Basic to Advanced foamboard building skills. With the 50mm EDF setup this is a good plane for first time Foamboard EDF builders and beginner Flyers. It is fairly easy to build and has rock solid flight characteristics.
PDF Plan Cost:**FREE!!** |
![]() |
Basic Plane Specs | |
Wingspan: | 23.0 Inches (58.42cm) |
Length: | 24.77 Inches (62.92cm) |
All Up Weight (AUW) | 18.0oz. (510.3gm) |
Recommended Parts Needed To Finish Build | ||||
Basic Setup | (50+MPH) | |||
EDF & Motor: | HobbyKing DR. Mad Thrust 50mm | |||
ESC: | 40A Brushless ESC with BEC | |||
Battery: | 4S 1300mA 60C or Better | |||
Servos: | 2 Mini Metal Gear (9 to 16 gram) | |||
TX/RX: | 4-Channel or better w/Delta Mixing |
Build Video:
Flight Videos: Coming Soon, Stay tuned!!
Hey everyone,
I just created a new Flag Decal for the the new FF-117V2 RC Plane. I wanted to make a flag that looks like the bottom of the real F-117 they used at Airshows. I created a PDF that has both the tiled and NON-tiled decal sheets. Free to download, just click on the link!
Click Here!!! FF-117V2 Flag Decal

Picture of real F-117 (Picture from internet search)
*** rcFoamFighters FF-NojaJet ***
Model Name: FF-NovaJet
Plan Design By: Paul Petty (Nov. 2008)
Description: Original EPP Foam RC Model Airplane created by Paul Petty. The FF-NovaJet was designed to be a fast and agile Flyer. The plane features a semi-symmetrical airfoil main wing, blended wing/fuselage and straight vertical stabilizers. Also features Mixed Delta Aileron/Elevator control surfaces for “Bank and Hank” type flying. Recommended all hobbyists with Basic to Advanced foam building skills. This is a good plane for first time EPP Foam builders and Flyers with Intermediate to Advanced Flying Skills. It is a super agile plane and can turn on a dime, but at the same time has rock solid flight characteristics.
PDF Plan Cost:**FREE!!** |
![]() |
Basic Plane Specs | |
Wingspan: | 28.0 Inches (71.12cm) |
Length: | 29.4 Inches (74.68cm) |
All Up Weight (AUW) | 28.3oz. (880.23gm) |
Recommended Parts Needed To Finish Build | ||||
Basic Setup | (75+MPH) | Fast Setup | (100+MPH) | |
Motor: | 2212 2200KV Brushless Motor | Motor: | Grayson Hobby Super Mega Jet | |
ESC: | 30A Brushless ESC with BEC | ESC: | 50A Brushless ESC with BEC | |
Prop: | 6×4 PROP | Prop: | APC 6X5.5 | |
Battery: | 3S 2200mA 25C or Better | Battery: | 3S 2200mA 45C or Better | |
Servos: | 2 Mini Metal Gear (9 to 16 gram) | Servos: | 2 Mini Metal Gear (9 to 16 gram) | |
TX/RX: | 4-Ch or better w/Delta Mixing | TX/RX: | 4-Ch or better w/Delta Mixing |
Original Old Flight Videos:
*** rcFoamFighters FF-SkyFighter V2 ***
Model Name: FF-SkyFighter V2
Plan Design By: Frank Petty (July 2009)
Description: Original EPP Foam RC Model Airplane created by Frank Petty. The SkyFigther was designed to be a fast and agile Flyer. The plane features a semi-delta shaped wing, contoured EPP fuselage and straight vertical stabilizers. Also features Mixed Delta Aileron/ Elevator control surfaces for “Bank and Hank” type flying. Recommended to hobbyists with Intermediate to Advanced foam building and Flying skills.
PDF Plan Cost:**FREE!!** |
![]() |
Basic Plane Specs | |
Wingspan: | 28.0 Inches |
Length: | 23.5 Inches |
All Up Weight (AUW) | 24.0oz. |
Recommended Parts Needed To Finish Build | ||||
Basic Setup | (90+MPH) | Fast Setup | (110+MPH) | |
Motor: | 2212 2200KV Brushless Motor | Motor: | Grayson Hobby Super Mega Jet | |
ESC: | 30A Brushless ESC with BEC | ESC: | 50A Brushless ESC with BEC | |
Prop: | 6×4 PROP | Prop: | APC 6X5.5 | |
Battery: | 3S 2200mA 25C or Better | Battery: | 3S 2200mA 45C or Better | |
Servos: | 2 Mini Metal Gear (9 to 16 gram) | Servos: | 2 Mini Metal Gear (9 to 16 gram) | |
TX/RX: | 4-Ch or better w/Delta Mixing | TX/RX: | 4-Ch or better w/Delta Mixing |
Original Old Development, & Flight Videos:
*** rcFoamFighters FF-SuperNova ***
Model Name: FF-SuperNova
Plan Design By: Paul Petty (Feb. 2010)
Description: Original RC Model Airplane created by Paul Petty. This plane is a scaled up version of the FF-Novajet. The plane built by rcFoamFighters was made out of super durable EPP Foam. This is currently the fastest plane in Paul’s fleet and his favorite design to date. It features a semi-symmetrical, 30mm thick main wing, with a contoured fuselage and straight vertical stabilizers. Also features basic Aileron & Elevator control surfaces for “Bank and Hank” type flying. With the motor used by rcFoamFighters the plane has reached speeds of over 140 miles per hour. These speeds have been consistently verified on the Radar Gun, GPS and Wave File method. Recommended for hobbyists with Intermediate to Advanced foam building skills. This plane is not recommended for beginner flyers. The plane is a rock solid Flyer with awesome flight characteristics.
PDF Plan Cost:**FREE!!** |
![]() |
Basic Plane Specs | |
Wingspan: | 34.0 Inches (86.36cm) |
Length: | 35.7 Inches (90.68cm) |
All Up Weight (AUW) | 48.6oz. (1377.8gm) |
Recommended Parts Needed To Finish Build | ||||
Basic Setup | Fast Setup | (140+MPH) | ||
Motor: | Motor: | HobbyKing Turnigy 3648-1450 | ||
ESC: | ESC: | 100Amp Brushless ESC | ||
Prop: | Prop: | APC 7×8 Sport Prop | ||
Battery: | Battery: | 5S 2650mA 65C or Better | ||
Servos: | Servos: | 2 Metal Gear | ||
TX/RX: | TX/RX: | 4-Channel or better w/Delta mixing |
***Note: Turnigy 3648-1450 motor must be modified!!!! (Click Here To See Video)***
Original Old Development, & Flight Videos:
*** rcFoamFighters FF-117V2 ***

FF-117V2 by Paul Petty, Jan. 2018
Model Name: FF-117V2
Plan Design By: Paul Petty (Jan. 2018)
Description: An updated version Foamboard RC Model Airplane with a design inspired by the Lockheed F117 Stealth Fighter.. The plane features a unique diamond faced fuselage, KFm2 Airfoil and angled vertical stabilizers. Also features Delta Mixed Elevator and Aileron control surfaces for “Bank and Hank” flying. This version of the plane has a much more scale looking 3D shaped fuselage than the version one FF-117. Recommended for hobbyists with Intermediate to Advanced foamboard building skills and not complete beginners. There are many double 45 degree bevel cuts required to produce the multi-faceted fuselage. This plane really looks great on the ground or flying by in the sky!
PDF Plan Cost:$6.00 |
![]() |
Basic Plane Specs | |
Wingspan: | 26.0 Inches (66.04cm) |
Length: | 39.61 Inches (100.6cm) |
All Up Weight (AUW) | 25.0oz. (708.7gm) |
Recommended Parts Needed To Finish Build | ||||
Basic Setup | (65+MPH) | Fast Setup | ||
Motor: | Grayson Hobby Super Mega Jet | Motor: | ||
ESC: | 50A Brushless ESC with BEC | ESC: | ||
Prop: | APC 6X5.5 | Prop: | ||
Battery: | 3S 2200mA 40C or Better | Battery: | ||
Servos: | 2 Mini Metal Gear (9 to 16 gram) | Servos: | ||
TX/RX: | 4-Channel or Better w/Delta Mixing | TX/RX: |
Build Video:
Flight Videos:
(New Flight Videos Coming as Soon as weather permits)
Old Development Flight Videos:
Extra Stuff… Free Flag Decal for the Bottom of the FF-117V2, just click on the link: FF-117V2 Flag Decal
How to find Lipo Battery Maximum Constant Amp Draw
We have been getting several questions about power systems and batteries. So we thought we would first do a “How to” guide on finding what your Lipo Battery’s Maximum Constant Amp Draw is. Knowing how to find this can help you better design your RC Airplane power system correctly and help keep from overheating, puffing, and/or destroying your Lipo Battery.
Here is a simple formula that we have found to be commonly used in the RC Community to find the
Maximun Constant Amps a Lipo Battery is capable to sustain.
Formula: (C-Rating) X (AH) = Maximum Constant Amp Draw
Now to use this formula you first need to convert your battery size from the common MilliAmpHours to AmpHours. A MilliAmp is One-Thousandth of an Amp. So here are some Examples of converting MilliAmpHours to AmpHours:
800mAH = .800AH
1350mAH = 1.350AH
2000mAH = 2.200AH
The converted number will be the “(AH)” in the formula. Now that you have your “(AH)” number, plug it in to the formula with the “C” rating number of your Battery and Calculate.
Here are some Examples:
(800mAH 10C Lipo Battery): .800AH X 10C = 8Amps Max Constant
(800mAH 20C Lipo Battery): .800AH X 20C = 16Amps Max Constant
(1350mAH 15C Lipo Battery): 1.350AH X 15C = 20.25Amps Max Constant
(1350mAH 30C Lipo Battery): 1.350AH X 30C = 40.50Amps Max Constant
(2200mAH 20C Lipo Battery): 2.200AH X 20C = 44.00Amps Max Constant
(2200mAH 30C Lipo Battery): 2.200AH X 30C = 66.00Amps Max Constant
After you Know what your Battery can Handle:
Now that you know what your battery can handle, you can now choose an appropriate power system that will meet the battery’s output range. Good common practice and recommendation is to use a battery that is rated somewhere between 1.5 to 2 times the actual max amp demand of the components installed. (Motor / Prop / ESC / Servos / Receiver / etc.) So in example, if your motor/prop/esc demand 20Amps max, you should use a battery with a Max Constant Amp rating of 30 to 40 Amps or better.
The best way to see the actual real time Amp draw of your power system is to use an Amp/Watt meter and test with the actual setup to be used. As a starting point you can also refer to the manufacturer’s spec sheet for all component ratings.
Here is a link to a Free Excel Calc Tool we have made to make it easier to estimate your battery’s max constant amps. It is based on the above formula. Please use at your own discretion.
http://rcfoamfighters.com/FileDownloads/Lipo%20Battery%20Amp%20Calc.zip
Pic of Tool:
Hope this helps.
Frank & Paul of rcFoamFighters
*** rcFoamFighters FF-23V2 ***
Model Name: FF23V2
Plan Design By: Paul Petty (June 2016)
Description: Foamboard RC Model Airplane with a design inspired by the YF-23 Advanced Tactical Fighter. The plane features a unique diamond shaped wing with a KFm2 Airfoil and 45 degree angled vertical stabilizers. Also features basic Elevator and Aileron control surfaces for “Bank and Hank” flying. 3D shaped cockpit & fuselage for semi-scale looks. Recommended for hobbyists with Intermediate to Advanced foamboard building skills and not complete beginners.
PDF Plan Cost:$6.00 |
![]() |
Basic Plane Specs | |
Wingspan: | 28.0 Inches (71.12cm) |
Length: | 42.2 Inches (107.19cm) |
All Up Weight (AUW) | 27.0oz. (840gm) |
Recommended Parts Needed To Finish Build | ||||
Basic Setup | (65+MPH) | Fast Setup | (80+MPH) | |
Motor: | Grayson Hobby Super Mega Jet | Motor: | Grayson Hobby Monster Jet | |
ESC: | 50A Brushless ESC with BEC | ESC: | 60A to 70A Brushless ESC w/BEC | |
Prop: | APC 6X5.5 | Prop: | APC 6X5.5 | |
Battery: | 3S 2200mA 40C or Better | Battery: | 4S 2200mA 45C or Better | |
Servos: | 3 Mini Metal Gear (9 to 16 gram) | Servos: | 3 Mini Metal Gear (9 to 16 gram) | |
TX/RX: | 4-Channel or Better RX and TX | TX/RX: | 4-Channel or Better RX and TX |
Build Videos:
Flight Videos:
*** rcFoamFighters FF-T50***
Model Name: FF-T50
Plan Design By: Paul Petty (May 2011)
Description: An original design Foamboard RC Model Airplane by Paul Petty inspired by the Russian T50 PAK-FA Stealth Fighter Concept. The plane features a flat shaped wing with a 3D shaped fuselage and angled vertical stabilizers. Also features Delta Mixed Quad Aileron/Elevator control surfaces for “Bank and Hank” flying. 3D shaped cockpit & fuselage for low drag and semi-scale looks. Recommended for hobbyists with Intermediate to Advanced foamboard building skills. With the basic setup the plane is OK for beginner to advanced pilots. The Fast Setup is recommended for pilots with adequate flying skill and not beginners.
PDF Plan Cost:$6.00 |
![]() |
Basic Plane Specs | |
Wingspan: | 24.0 Inches (60.96cm) |
Length: | 32.86 Inches (83.46cm) |
All Up Weight (AUW) | 23.0oz. (652gm) |
Recommended Parts Needed To Finish Build | ||||
Basic Setup | (55+MPH) | Fast Setup | (70+MPH) | |
Motor: | 2212 2200KV Brushless Motor | Motor: | Grayson Hobby Super Mega Jet | |
ESC: | 30A Brushless ESC with BEC | ESC: | 50A Brushless ESC with BEC | |
Prop: | 6×4 PROP | Prop: | APC 6X5.5 | |
Battery: | 3S 2200mA 40C or Better | Battery: | 3S 2200mA 40C or Better | |
Servos: | 2 Mini Metal Gear (9 to 16 gram) | Servos: | 2 Mini Metal Gear (9 to 16 gram) | |
TX/RX: | 4-Channel with Delta Mixing | TX/RX: | 4-Channel with Delta Mixing |
Build & Flight Videos:
*** rcFoamFighters FF-BOP (Bird Of Prey) ***
Model Name: FF-BOP
Plan Design By: Paul Petty (Aug. 2011)
Description: Original Foamboard RC Model Airplane with a design inspired by the Boeing Bird of Prey concept stealth jet. The plane features a unique Gull Wing shaped wing and a lifting body type fuselage. Also features Mixed Delta Elevator/Aileron control surfaces for “Bank and Hank” flying. 3D sleek cockpit & fuselage for semi-scale looks. Recommended for hobbyists with Intermediate to Advanced foamboard building skills. This plane is a great Flyer for pilots with intermediate to advanced skills. Note this plane if built should only be hand launched at about half to three quarter throttle. The small size and wing shape can make it apt to having torque roll at launch. Once speed is built up it flies nicely. Because of these flight characteristics it is recommended only for pilots with the adequate skills.
PDF Plan Cost:$6.00 |
![]() |
Basic Plane Specs | |
Wingspan: | 21.64 Inches (54.97cm) |
Length: | 35.32 Inches (89.71cm) |
All Up Weight (AUW) | 21.0oz. (595gm) |
Recommended Parts Needed To Finish Build | ||||
Basic Setup | (70+MPH) | Fast Setup | ||
Motor: | 2212 2200KV Brushless Motor | Motor: | ||
ESC: | 30A Brushless ESC with BEC | ESC: | ||
Prop: | 6×4 PROP | Prop: | ||
Battery: | 3S 2200mA 45C or Better | Battery: | ||
Servos: | 2 Mini Metal Gear (9 to 16 gram) | Servos: | ||
TX/RX: | 4-Ch or better w/Delta Mixing | TX/RX: |
Build & Flight Videos:
*** rcFoamFighters FF-117 ***
Model Name: FF-117
Plan Design By: PaulPetty (Jan. 2010)
Description: Foamboard RC Model Airplane created by Paul Petty. The FF-117 is inspired by the F-117 Stealth Fighter of the US Air Force. The plane features a simple flat wing, angular diamond box fuselage and slanted vertical stabilizers. Also features Mixed Delta Aileron/ Elevator control surfaces for “Bank and Hank” type flying. Recommended all hobbyists with Basic to Advanced foamboard building skills. This is a good plane for first time Foamboard builders and beginner Flyers because of its easy build and rock solid flight characteristics.
PDF Plan Cost:**FREE!!** |
![]() |
Basic Plane Specs | |
Wingspan: | 26.0 Inches (66cm) |
Length: | 34.5 Inches (87.6cm) |
All Up Weight (AUW) | 29.0oz. (882.0gm) |
Recommended Parts Needed To Finish Build | ||||
Basic Setup | (50+MPH) | Fast Setup | (74+MPH) | |
Motor: | 2212 2200KV Brushless Motor | Motor: | Grayson Hobby Super Mega Jet | |
ESC: | 30A Brushless ESC with BEC | ESC: | 50A Brushless ESC with BEC | |
Prop: | 6×4 PROP | Prop: | APC 6X5.5 | |
Battery: | 3S 2200mA 25C or Better | Battery: | 3S 2200mA 45C or Better | |
Servos: | 2 Mini Metal Gear (9 to 16 gram) | Servos: | 2 Mini Metal Gear (9 to 16 gram) | |
TX/RX: | 4-Ch or better w/Delta Mixing | TX/RX: | 4-Ch or better w/Delta Mixing |
Original Old Development, Build, & Flight Videos:
*** rcFoamFighters FF-Aurora ***
Model Name: FF-Aurora
Plan Design By: Paul Petty (Jan. 2012)
Description: Original Foamboard RC Model Airplane with a design inspired by the rumored Top Secret Aurora Hyper-sonic Spy Plane. The plane features a Delta shaped wing with a KFm2 Airfoil and angled vertical stabilizers. Also features Mixed Delta Elevator/Aileron control surfaces for “Bank and Hank” flying. 3D sleek cockpit & fuselage for scale looks. Recommended for hobbyists with Intermediate to Advanced foamboard building skills. This plane is a great Flyer for pilots of all skills with a smaller slower motor set up or for Advance Pilots who love speed with the bigger, faster motor setups.
PDF Plan Cost:$6.00 |
![]() |
Basic Plane Specs | |
Wingspan: | 28.0 Inches (71.12cm) |
Length: | 34.04 Inches (86.46cm) |
All Up Weight (AUW) | 27.0oz. (840gm) |
Recommended Parts Needed To Finish Build | ||||
Basic Setup | (75+MPH) | Fast Setup | (100+MPH) | |
Motor: | Grayson Hobby Super Mega Jet | Motor: | Grayson Hobby Monster Jet | |
ESC: | 50A Brushless ESC with BEC | ESC: | 60A to 70A Brushless ESC w/BEC | |
Prop: | APC 6X5.5 | Prop: | APC 6X5.5 | |
Battery: | 3S 2200mA 40C or Better | Battery: | 4S 2200mA 45C or Better | |
Servos: | 2 Mini Metal Gear (9 to 16 gram) | Servos: | 2 Mini Metal Gear (9 to 16 gram) | |
TX/RX: | 4-Ch. or better with Delta Mixing | TX/RX: | 4-Ch or better with Delta Mixing |
Design Concept and Flight Videos:
*** rcFoamFighters FF-23 ***
Model Name: FF-23
Plan Design By: PaulPetty (Jan. 2009)
Description: Foamboard RC Model Airplane created by Paul Petty. The FF-23 is inspired by the YF-23 plane that competed to be the USA’s next Advanced Tactical Fighter. The RC plane features a simple flat wing but with a unique diamond shape. It has a box fuselage and slanted vertical stabilizers. Also features basic Aileron & Elevator control surfaces for “Bank and Hank” type flying. Recommended hobbyists with Basic to Advanced foamboard building skills. This plane is recommended for Intermediate to Advanced Flyers because of its flight characteristics.
PDF Plan Cost:**FREE!!** |
![]() |
Basic Plane Specs | |
Wingspan: | 24.0 Inches (60.96cm) |
Length: | 35.35 Inches (89.79cm) |
All Up Weight (AUW) | 24.0oz. (580.4gm) |
Recommended Parts Needed To Finish Build | ||||
Basic Setup | (60+MPH) | Fast Setup | (80+MPH) | |
Motor: | 2212 2200KV Brushless Motor | Motor: | Grayson Hobby Super Mega Jet | |
ESC: | 30A Brushless ESC with BEC | ESC: | 50A Brushless ESC with BEC | |
Prop: | 6×4 PROP | Prop: | APC 6X5.5 | |
Battery: | 3S 2200mA 25C or Better | Battery: | 3S 2200mA 45C or Better | |
Servos: | 3 Mini Metal Gear (9 to 16 gram) | Servos: | 3 Mini Metal Gear (9 to 16 gram) | |
TX/RX: | 4-Channel or better | TX/RX: | 4-Channel or better |
Original Old Development, Build, & Flight Videos:
*** rcFoamFighters FF-22 ***
Model Name: FF-22
Plan Design By: PaulPetty (Jan. 2009)
Description: Foamboard RC Model Airplane created by Paul Petty. The FF-22 is inspired by the F-22 Raptor of the US Air Force. The plane features a simple flat wing, box fuselage and slanted vertical stabilizers. Also features basic Aileron & Elevator control surfaces for “Bank and Hank” type flying. Recommended all hobbyists with Basic to Advanced foamboard building skills. This is a good plane for first time Foamboard builders and beginner Flyers because of its easy build and rock solid flight characteristics.
PDF Plan Cost:**FREE!!** |
![]() |
Basic Plane Specs | |
Wingspan: | 24.0 Inches (60.96cm) |
Length: | 36.46 Inches (92.60cm) |
All Up Weight (AUW) | 24.0oz. (580.4gm) |
Recommended Parts Needed To Finish Build | ||||
Basic Setup | (60+MPH) | Fast Setup | (80+MPH) | |
Motor: | 2212 2200KV Brushless Motor | Motor: | Grayson Hobby Super Mega Jet | |
ESC: | 30A Brushless ESC with BEC | ESC: | 50A Brushless ESC with BEC | |
Prop: | 6×4 PROP | Prop: | APC 6X5.5 | |
Battery: | 3S 2200mA 25C or Better | Battery: | 3S 2200mA 45C or Better | |
Servos: | 3 Mini Metal Gear (9 to 16 gram) | Servos: | 3 Mini Metal Gear (9 to 16 gram) | |
TX/RX: | 4-Channel or better | TX/RX: | 4-Channel or better |
Original Old Development, Build, & Flight Videos:
*** rcFoamFighters FF-Bullet Plane ***
Model Name: FF-BulletPlane
Plan Design By: Frank Petty (Feb. 2011)
Description: An original design Foamboard RC Model Airplane by Frank Petty. The plane features a Delta shaped wing with a KFm2 Airfoil with fuselage and wing tip vertical stabilizers. Also features basic Delta Mixed Aileron/Elevator control surfaces for “Bank and Hank” flying. Sleek shaped cockpit & fuselage for low drag and high speeds. Recommended for hobbyists with Basic to Advanced foamboard building skills. Because this is a fast flying plane it is recommended for pilots with adequate skill and not beginners.
PDF Plan Cost:$6.00 |
![]() |
Basic Plane Specs | |
Wingspan: | 24.0 Inches (60.96cm) |
Length: | 28.69 Inches (72.87cm) |
All Up Weight (AUW) | 16.0oz. (453.6gm) |
Recommended Parts Needed To Finish Build | ||||
Basic Setup | (80+MPH) | Fast Setup | (100+MPH) | |
Motor: | 2212 2200KV Brushless Motor | Motor: | Grayson Hobby Super Mega Jet | |
ESC: | 30A Brushless ESC with BEC | ESC: | 50A Brushless ESC with BEC | |
Prop: | 6×4 PROP | Prop: | APC 6X5.5 | |
Battery: | 3S 1300mA 40C or Better | Battery: | 3S 1800mA 40C or Better | |
Servos: | 2 Mini Metal Gear (9 to 16 gram) | Servos: | 2 Mini Metal Gear (9 to 16 gram) | |
TX/RX: | 4-Channel with Delta Mixing | TX/RX: | 4-Channel with Delta Mixing |