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BVM's Airframe Addendum History

F-4 F-86 (80) Super Bandit

 

F-4 Phantom
Airframe Directive (A.D.)
And other helpful notes

Large Fuel Cell Transfer Tubes
Replace Brass with Stainless Steel
(4/20/06)

There has been one case where the brass tube that transfers fuel through a hole in the fuel cell baffle experienced a razor saw-like cut. The engine flamed out because the remaining fuel below the tube was unusable.
The most likely cause of the brass tubing failure was many miles of trailer transport of the model with the fuel cells empty.

The Fix

BVM now supplies Stainless Steel tubes with the large baffled fuel cells i.e., KingCat, F-100, F-4, Rafale, F-86 (80"). Retrofit parts are available. Ask for part #PSTU003 (quantity 2) price $5.00 for the pair mailed within the USA.
To be honest, we don't know how many travel miles the brass tubes will withstand. It could vary quite a bit. BVM is converting our factory demo models as time allows. Our prototype F-100D is 6 years old, has at least 300 flights and more trailer miles than we can count. We inspected the brass tubes and found minimum wear. We changed them to the Stainless Steel variety anyway.


Wing Pylon Mounting

  • Locate drill locations per plans.
  • Drill pilot holes with 1/8” bit. be sure to align drill vertically with respect to ground stance of model. (not surface of wing skin).
  • Re-drill with 3/16 bit, then with 13/64” bit. (hole size is critical for proper installation of brass insert.)
  • Install brass insert onto 4-40 socket head bolt. Slowly thread insert into hole. Maintain vertical alignment to avoid breaking maple block loose in wing.
  • Remove bolt from insert, if insert does not release, place a drop of water into hole to swell maple block around insert. Wait 10 minutes, then try to remove bolt again. If needed, a drop of ZAP can be used to hold insert in position in block.

Landing Gear door control - improved operation.
The micro switch trigger system currently shown on the plans can be improved upon. Recently we deleted it in the "Blue Angel" because of unreliable operation in a crosswind and the difficulty in properly adjusting it.
We installed a set to the "non-sequencing" mode. This assures that system air pressure continues to hold the door firmly open until the gear are up and provides ample time for all gear to be completely up before the doors are signaled to close.
 
 
Center of Gravity
The plans show 12-1/4” measured outboard along the leading edge. Change it to 12-3/4”.


Stab Servo Control
This photo shows (2) 8411 servos in tandem. The Blue Angel has been flying with this setup at speeds up to 200mph. I have a lot of confidence in the digital JR 8411 servos.




I have been flying the Blue Angel F-4 quite a lot lately and have taken the time to analyze and experiment with the C.G. and control travels. I believe that the following changes enhance the general flight characteristics, especially the axial roll.

Aileron differential – accomplish by rotating the servo arm forward about 20° from vertical and putting a slight bend in the 1/16” control rod (about 10°) to clear the servo shaft. Measure the aileron travel at the outboard end.

Up aileron = 1.3”
This is with the rate switch in the center position.
Down aileron = .9”

 
Engine access compartment
enhanced photo

16oz Start and Taxi tank not necessary for competition flying

I flew the Blue Angel (clean wing) in "Fun Scale" at the AMA Nationals 2000 just to enjoy the event and display the Phabulous Phantom to many who have not seen it go.
As it turned out I was landing with too much fuel remaining - I actually had to do a few extra maneuvers to burn off the extra weight.  Conclusion:  The extra 16oz round tank that I called the "start and taxi" fuel is not required with the Pegasus engine.  This space could be used to add a smoke system if desired.

For those F-4E customers, here are a few photos of how Craig Gottschang arranged the front end of his Phantom.  All charging, air servicing and starting functions are performed with the nose cone removed.  Fueling is accomplished through the main engine access as per the "S" nose versions.



 

F-86 (80") Addendums

Gyro Mount
(addendum #042006)


There should be a wedge shaped balsa shim placed under the Gyro such that its base is parallel to a ground plane. This part was not included in some early Sabre jet kits.

Simply shape a wedge from a piece of hard balsa, seal it with a wipe of Slo-ZAP or Epoxy and glue it to the 1/8" ply platform. Mount the gyro to the platform with adhesive backed Velcro on the bottom and a wrap of 3/8" or 1/2" wide Velcro strap. A straight edge applied to the side of the gyro should be vertical to the ground plane.


Large Fuel Cell Transfer Tubes
Replace Brass with Stainless Steel
(4/20/06)

There has been one case where the brass tube that transfers fuel through a hole in the fuel cell baffle experienced a razor saw-like cut. The engine flamed out because the remaining fuel below the tube was unusable.
The most likely cause of the brass tubing failure was many miles of trailer transport of the model with the fuel cells empty.

The Fix

BVM now supplies Stainless Steel tubes with the large baffled fuel cells i.e., KingCat, F-100, F-4, Rafale, F-86 (80"). Retrofit parts are available. Ask for part #PSTU003 (quantity 2) price $5.00 for the pair mailed within the USA.
To be honest, we don't know how many travel miles the brass tubes will withstand. It could vary quite a bit. BVM is converting our factory demo models as time allows. Our prototype F-100D is 6 years old, has at least 300 flights and more trailer miles than we can count. We inspected the brass tubes and found minimum wear. We changed them to the Stainless Steel variety anyway.

 


Alternate Speed Brake Hinge Door Actuation
(addendum #12306)

click here to download pdf (583 kb)


 

Kevlar Fuel Cell Reinforcement
(addendum #111405)

click here to download pdf (561 kb)


 

Wing Plans
discrepancy
(addendum #061505)
This affects kits delivered prior to June 16, 2005.

The inboard hinge is shown reversed. The leg of the hinge that supports the aileron should be outboard of the wing mounted leg.

The Fix

Align the aileron with the wing based on the center hinge location. Trim both ends of the aileron as necessary to fit adjacent to the flap and flush with the tip rib. A disc or belt sander is handy to trim the aileron ends.

IMPORTANT: The 3/16" spacer blocks as shown on page 27 are essential for proper alignment.


Aileron & Elevator trim,
Hard Landing check and Thrust Limitations
(addendum #033005)
click here to download pdf (8 kb)

 

CG location, final rigging and pre-flight
(addendum #032205)
click here to download pdf (72 kb)
click here to download drawing for addendum #032205

 

 

Fuel Pump Mount Location
(page 10, Gearing Up Manual - updated 2/18/05)
click here to download new page 10



These addendums are for kits shipped prior to 12/27/04 only.

Main Gear Flex Plate modification
(page 11 - updated 12/27/04)
click here to download new page 11

 

Fowler Flap Mechanism
Transfer Assembly dimension - reference plans
Instruction manual changed - 12/27/04 - page 32
click here to download new page 32

 

Inlet Installation
Instruction manual updated 12/27/04 - page 48
click here to download new page 48


 

SUPER BANDIT
Airframe Directive (A.D.)
And other helpful notes

Wing Pylon Mounting

  • Locate drill locations per plans.
  • Drill pilot holes with 1/8” bit. be sure to align drill vertically with respect to ground stance of model. (not surface of wing skin).
  • Re-drill with 3/16 bit, then with 13/64” bit. (hole size is critical for proper installation of brass insert.)
  • Install brass insert onto 4-40 socket head bolt. Slowly thread insert into hole. Maintain vertical alignment to avoid braking maple block loose in wing.
  • Remove bolt from insert, if insert does not release, place a drop of water into hole to swell maple block around insert. Wait 10 minutes, then try to remove bolt again. If needed, a drop of ZAP can be used to hold insert in position in block.

 

 

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