I am going to be fabricating the pulley brackets for the MAM Amphib
floats and have a question on the size of said pulleys.
I received 2.50 inch OD x 1.90 inch ID (Part Number BB 128) pulleys with
my 1800 float kit, The plans (Fig. 15.2.
show that the brackets willfit these pulleys.
I have noticed similar float installations (not MAM) that use 2.00 inch
OD pulleys. One supplier sells a float water rudder pulley that is 1.50
OD. Browsing through Aircraft Spruce catalog,, there are two Special
Pulleys made from UHMW material with stainless inserts. 1.50 inch OD and
2.00 OD. In the description, it is mentioned that the 2.00 inch "fits
DeHavilland Beaver floats".
Is the 2.50 OD size pulley supplied by MAM used because of the (almost)
90 degree angle the cable makes or can one substitute a smaller (2.00
inch OD)?
What is the correct outside and inside diameter of the pulleys used on
the MAM 1800 Amphib floats as well as the rudder retract pulley at the
forward floor centerline?
If the smaller 2.00 inch OD is the pulley of choice, I can purchase
correct ones and make a new drawing to fit the new diameter. Are there
any gotchas (other than different shaped brackets) if a 2.00 inch OD
pulleys are used? Part Numbers?
Comments? Suggestions?
Thanks in advance.
Terry Dazey
Rebel 662
Lake Tapps, WA U.S.A.
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