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Ernest,
Seems to me that one tooth on the ring gear will be displaced by one tooth
on the sun gear, without regard to intermediate idlers: 74/34 = 2.1765. I
think you have a 2.17 planetary set.
I don't understand the addition of unity.
Jack Ford
----- Original Message ----- From: "Ernest Christley" <echristley@nc.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, June 14, 2005 8:24 PM
Subject: [FlyRotary] planetary gear ratios
I ran across some information in one of the scientific newsgroups on how
to calculate the gear ratio of a planetary gear set.
ratio = 1 + r / s
where: r = number of ring gear teeth
s = number of sun gear teeth.
I haven't replace my 3-pinion gear set with a 6-pinion set, because I've
not been able to positively identify it to where I could call out a part
number. Order strange gearset from the internet is not what I consider
an efficient way to spend money. So I went out and counted. 74 teeth
on the ring and 34 on the sun.
1+74/34 = 3.176
That is not the 2.17 OR the 2.85 from the Ford gear sets. Is it
possible that the one isn't added in standard practice, so that what I
actually have is the 2.17 gear set?
-- This is by far the hardest lesson about freedom. It goes against
instinct, and morality, to just sit back and watch people make
mistakes. We want to help them, which means control them and their
decisions, but in doing so we actually hurt them (and ourselves)."
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