Bill,

It is a two blade fixed prop.  It spins!

The singing is probably around 400 hz.  I might use my phone with the db app and find what actual frequency it is.  It is not a concerning sound, just wondered if we are unique.

I have thought about a geared feathering prop but the boat bucks always make me keep thinking.  Grace was never raced and has a fixed prop, no adjustable backstay adjuster and fixed babystay adjustment.  I can live with those though I have thought about prop and hydraulic backstay adjuster.

Neil Schiller
1983 C&C 35-3, #028, "Grace"
Whitehall, Michigan
WLYC

On 6/17/2020 9:40 AM, Bill Coleman via CnC-List wrote:

I don’t think your shaft should be spinning.

Can’t you put it in reverse to stop the shaft from spinning, then neutral? Or do you not have a folding prop –

Bill Coleman

*From:*CnC-List [mailto:cnc-list-boun...@cnc-list.com] *On Behalf Of *schiller via CnC-List
*Sent:* Wednesday, June 17, 2020 7:38 AM
*To:* cnc-list@cnc-list.com
*Cc:* schiller
*Subject:* Re: Stus-List C&C 35 Mark III

Ron,

Yes.  We sail with the transmission in neutral and can tell that the shaft is spinning.  We noted it the day that we sailed here home almost three years ago.  We tried to locate the source when we first heard it but can't really locate the source.  She sings on both tacks.  It doesn't concern us that she does this.  Just curious if she is unique.

Neil Schiller
1983 C&C 35-3, #028, "Grace"
Whitehall, Michigan
WLYC

On 6/17/2020 1:14 AM, Ronald B. Frerker via CnC-List wrote:

    Does it always happen at that speed; in other words, does a
    different alignment of the prop change anything?
    Ron
    Wild Cheri
    C&C 30-1
    STL

    On Tuesday, June 16, 2020, 08:11:05 PM CDT, Graham Collins via
    CnC-List <cnc-list@cnc-list.com> <mailto:cnc-list@cnc-list.com>
    wrote:

    Hi Neil

    No singing on hull #11.  We originally had a 2 blade fixed prop,
    and now are running a Kiwi Prop.

    Graham CollinsSecret PlansC&C 35-III #11

    On 2020-06-16 7:22 p.m., schiller via CnC-List wrote:

        OK Mark III owners, our C&C 35-3 "signs" with speeds between
        about 4.5 to 5 knots.  It is a definite harmonic signing that
        I have never been able to isolate.  We have a 2 blade fixed
        prop and sail with the transmission in neutral.  I am not
        complaining, I love it when she goes into singing mode.  It
        goes away above 5 knots and there is no impediment to
        exceeding that speed.  My question is if "Grace" is unique or
        does anyone else show this phenomena?

        BTW, we noted no singing when we hit 7.7 knots Sunday afternoon.

        Neil Schiller
        1983 C&C 35-3, #028, "Grace"
        Whitehall, Michigan
        WLYC


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