Pitbull 1 Fuselage ballast dimensions

[Allen Elliott]

Can someone please tell me the dimensions of the ballast for the fuselage of the Pitbull 1

Thanks 

[Mikeb52]

Hi Allan,

I think I have some brass ballast from Baudis that might fit. If it’s the same as for the Jedi lift. I’ll check and let you know. 
Mike. 

[Mikeb52]

Sorry, Allen!!

[Allen Elliott]

Not to worry Mike 

Once I have the dimensions I'll buy some brass and cut it up

And yes I believe it's the same as the Jedi

[oipigface]

I’ve got this note on my ipad which you may or may not be able to decipher, and which may or may not be accurate. Best of luck:

Pitbull ballast

 

Wing area 54.9dm2

 

Max weight 54.9 x 75 = 4.117kg

                                                                2 tungsten.          4.                   6

 

Airframe                      = 2.360kg

Fuselage ballast          = 0.262kg

Wing ballast                = 0.528kg.           604.8.                  681.6        748.4  

                                       _______

                                    = 3.150 kg.          3.227.                 3.304.        3.381

 

 

Tungsten density. 19.3 g/cm3

Brass density.       8.4 g/cm3

 

Tungsten ballast would weigh 1.825kg. Total 4.185kg.

Actual weight: 2.163kg

 

Slugs are 14x83 (6) and 16x50 (7)

Weighing    41.2      and  17.37 brass

                  220.0    and  114.0g tungsten 

 

 

 

 

Sent to M Drewet, 1/3/15

 

Tailplane area (calculated same way as the wing) is about 7.14dm squared. Assuming the angle between the tailplane halves is 110degrees, its projected area is therefore about 7.14xcos(35 degrees)=5.85 dm squared.

 

Total area (FAI rules) is thus 54.7 (wing) + 0.8 (fuselage) + 5.85 (tailplane)

=61.35.

 

Total permissible weight is then 4.6kg or thereabouts. Since the wing and tailplane areas are slight underestimates, the weight estimate is a bit low as well.

 

[oipigface]

My note says the fus ballast is 16x50. This isn’t right. It’s 16x10x50. 7 slugs.  At least the piece I measured this morning is. I seem to remember that early Pitbulls had slightly differently sized slugs. It would be easy test by cutting a piece of balsa to size and trying it.….and, just to be complete, where I say the wing ballast is 14x83, I mean 14 square.

[Allen Elliott]

Thanks everyone 

7Nr 5/8 x 3/8 50mm long, ordered from Metal4u

£29 inc £10 delivery