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The Unofficial Bearhawk FAQ Technical Tips and Tricks
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How to Notch Tubing by Budd Davisson
To determine the length and angle:
1. When riveting flush rivets (AN426), run
a line of masking tape either side of the line of holes (on the gun
side) and you'll find that the gun doesn't wander around anywhere near
as much.
2. When riveting AN470 rivets put a piece
of masking tape over the machined head of the rivet. You will very
rarely miss another one or get another smiley.
3. When driving 3/32nd rivets use about
35-40PSI. The longer the rivet attachment the slightly higher the
pressure.
4. When driving 1/8th rivets use about
65-70PSI. Again, when you need to use a longer rivet attachment
increase the pressure slightly.
5. Try as best you can to drive the rivet
in one go rather than multiple goes. Hold the rivet gun and bucking
bar as square to the rivet as possible and just let the bucking bar do
the work. If your pressures are right you'll see the head forming
before your eyes and it will feel right. There's no other way to
describe it.
Go Fast Tips (from Dwayne Parkinson) The more asterisks, the higher the priority *****1) Streamline the landing gear shock struts
*****2) Build
tear drop fairing inboard of the wheel pants that fair the inside axle
stub/gear leg intersections and brakes
**3) Fair
the intersection of the strut with the bottom of the wing
4) Internally mounted antennas
5) Flush
mounted Nav/Strobe lights in wing tips
6) Flush
screws instead of round on the doors windows and boot cowl
7) Flush
latch on oil door
****8) Make
sure area where air enters the engine compartment is as smooth as
possible by tightening up baffling, etc.
9) Make
sure area where air exits the engine is as smooth as possible
10) Make
sure the volume of cooling air going into the engine = the volume of
air exiting the engine
*11)
Flush mounted gas caps
12) Tail
wheel pant
***13)
Reflex flaps
14)
Reflex ailerons
15)
Flush mounted pop out tail lift handles similar to Cessna product
*16)
Streamline flying wires
*****17) Wheel
pants / Pressure recovery wheel pants like on an RV (I don't know what
that means)
18) Flush
camlocks on the engine cowl
19)
Aerodynamic or rear facing step peg rather than a round peg sticking
out from the landing gear (used to step into plane)
20)
Replace wing root vents with vents that can be opened or closed when
needed.
21)
Aerodynamic exhaust pipes angled back rather than sticking straight
out the bottom of the plane
**22) Tight
door and window seals
23) Gap
seals where appropriate
24) Light
prop optimized for cruise speed (or possibly ground adjustable)
25) Replace window catch on the bottom of the wing with lift gate type
shocks used in SUV's and mini-vans.
26) Use
small wheels
27) Wheel
hub covers
28) Flush
mounted door latches
*****29) BUILD
LIGHT (no insulation, few avionics, spartan interior, minimal primer
and paint, etc)
30) Find
the best weight/HP ratio for the engine
Hardware parts list (from AviPro QB list, modified with vendors I have used to acquire parts)
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