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From: "Jack Ford" <jackoford@theofficenet.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-1006585@logan.com>
Subject: Re: [FlyRotary] Re: planetary gear ratios
Date: Sun, 19 Jun 2005 07:25:25 -0700
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I just embarassed myself with this one.

Jack (Reopening mouth to remove foot)


----- Original Message ----- 
From: "Jack Ford" <jackoford@theofficenet.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Saturday, June 18, 2005 7:49 PM
Subject: [FlyRotary] Re: planetary gear ratios


> 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)."
> >
> >
> > >>  Homepage:  http://www.flyrotary.com/
> > >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
> >
> >
>
>
>
> >>  Homepage:  http://www.flyrotary.com/
> >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>
>