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 Post subject: Throttle/Mixture/Prop Knobs - easy to change?
PostPosted: 22 Jun 2010, 23:55 
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Have you guys changed your throttle/mixture/prop knobs? Is it just the one screw? is it easy?

Thanks :D

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 Post subject: Re: Throttle/Mixture/Prop Knobs - easy to change?
PostPosted: 23 Jun 2010, 01:00 
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Location: Canberra Australia
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I'm no expert, but I've seen them changed on a V35.

It's not one screw.

The screw in the centre of each knob connects to the centre of the cable and holds the push button against a spring. So, when you undo the screw in the centre of the push button part of the knob, keep the push button under control and get ready to catch it and the spring.

Once you've removed each push button and spring, you will get access to a large nut (I think it's about 5/8th of an inch) that holds each of the outer, vernier knobs on each cable. Under each of those nuts is a 'spikey' washer that I think helps to prevent the large nuts from coming undone.

Undo and remove the large nuts and the 'spikey' washers from each cable.

The outer, vernier knobs have a cut out, in the shape of a nut, which mates with a nut near the end of the outer part of each cable. The outer, vernier knobs are an interference fit on these nuts, so should come away with a little pressure and wiggling (applied to the knob!)

Fit new outer, vernier knobs to cables. Murhpy's Law continues to apply, so triple check colour match to cable function, and triple check that each knob is properly mated to the nut on the outer cable (otherwise the outer, vernier knob might be able to rotate without rotating the cable).

Secure each outer, vernier knob by fitting the spikey washers then tightening the nuts.

Insert springs into vernier knobs. Position push button over spring. Press in and hold the push button against the spring. Insert and tighten screws in the centre of each push button.

Test proper operation of each cable.


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 Post subject: Re: Throttle/Mixture/Prop Knobs - easy to change?
PostPosted: 23 Jun 2010, 08:20 
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Aircraft: 1980 Baron 58P
I used a different method.

Step 1. Call the mechanic.

Step 2. Pick up the plane after the mechanic is finished.

Step 3. Go fly.

:dancing:


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 Post subject: Re: Throttle/Mixture/Prop Knobs - easy to change?
PostPosted: 23 Jun 2010, 08:44 
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:D Tom

Thanks Clinton.

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 Post subject: Re: Throttle/Mixture/Prop Knobs - easy to change?
PostPosted: 23 Jun 2010, 10:18 
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Username Protected wrote:
I used a different method.

Step 1. Call the mechanic.

Step 2. Pick up the plane after the mechanic is finished.

Step 3. Go fly.

:dancing:

I fixed it for you:



Step 1. Call the mechanic.

Step 2. Pick up the plane after the mechanic is finished.

Step 3. Write the check.

Sept 4. Go fly.

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 Post subject: Re: Throttle/Mixture/Prop Knobs - easy to change?
PostPosted: 23 Jun 2010, 10:32 
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Took me about 20 minutes with two left hands.

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 Post subject: Re: Throttle/Mixture/Prop Knobs - easy to change?
PostPosted: 02 Aug 2010, 07:47 
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Location: S Sioux City, NE (7K8)
Aircraft: 1988 Bonanza F33A
Searched "knob" and found this fairly recent thread. Clinton, I appreciate the detail.
Is there a recommendation of which replacement knob to use? It appears they fall into the category of aluminum or plastic (sounds like recycle bins :) ). It seems most that I see on the web are a kit of all three knobs, though I only need one. Maybe RAPID?
My mixture knob recently had a partial failure and should be replaced. Any thoughts?

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 Post subject: Re: Throttle/Mixture/Prop Knobs - easy to change?
PostPosted: 02 Aug 2010, 07:54 
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Hi Bob - happy to be some help.

The new ones fitted to my V35 are the plastic ones. I got them from Cee Bailey's.

They seem to be very robust, but I haven't tried the metal ones. Accordingly, I can't report on comparative value for money.


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 Post subject: Re: Throttle/Mixture/Prop Knobs - easy to change?
PostPosted: 02 Aug 2010, 08:02 
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That was fast!

Those are the same knobs I'm looking at. There are two reasons:

1) Least expensive I've found so far
2) I saw something about the metal knobs getting hot, which does make some sense.

This forum is great! :cheers:

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 Post subject: Re: Throttle/Mixture/Prop Knobs - easy to change?
PostPosted: 02 Aug 2010, 09:47 
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Aircraft: 1965 Bonanza S35
Username Protected wrote:
That was fast!

Those are the same knobs I'm looking at. There are two reasons:

1) Least expensive I've found so far
2) I saw something about the metal knobs getting hot, which does make some sense.

This forum is great! :cheers:



That was one of the reasons I went with plastic. The main reason I switched em out though was to minimize confusion while I was getting checked out in my Bo. I actually had them in my possession before I picked up the plane. :D

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 Post subject: Re: Throttle/Mixture/Prop Knobs - easy to change?
PostPosted: 02 Aug 2010, 09:51 
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When you can buy the best for the lowest price you get VALUE. You will find this at

http://www.angerole.com/

go to Aviation Products and scroll down. The knobs are $99.

Ron Mathis, owner of Angerole is a Bonanza owner. His products are the best:


Please login or Register for a free account via the link in the red bar above to download files.

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 Post subject: Re: Throttle/Mixture/Prop Knobs - easy to change?
PostPosted: 02 Aug 2010, 10:28 
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Thanks, Max.

Angerole's reputation is tops, so I don't doubt the product for a second.

Any feedback about the metal knobs getting hot? It's not like your hand is on them all the time, but just the same I wouldn't want a knob to conduct a bunch of engine heat via the cable and then grab it :bugeye:

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 Post subject: Re: Throttle/Mixture/Prop Knobs - easy to change?
PostPosted: 02 Aug 2010, 13:08 
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Username Protected wrote:
Thanks, Max.

Angerole's reputation is tops, so I don't doubt the product for a second.

Any feedback about the metal knobs getting hot? It's not like your hand is on them all the time, but just the same I wouldn't want a knob to conduct a bunch of engine heat via the cable and then grab it :bugeye:

Never noticed it. Aluminum doesn't retain heat very well. 1,300 hours with metal knobs on both my Bo's.

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 Post subject: Re: Throttle/Mixture/Prop Knobs - easy to change?
PostPosted: 02 Aug 2010, 13:17 
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Aircraft: '65 Deb C33
My AL knobs aren't hot.......sounds like I might be missing out.

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 Post subject: Re: Throttle/Mixture/Prop Knobs - easy to change?
PostPosted: 02 Aug 2010, 18:56 
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Joined: 09/28/09
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Location: S Sioux City, NE (7K8)
Aircraft: 1988 Bonanza F33A
Username Protected wrote:
My AL knobs aren't hot.......sounds like I might be missing out.

Max, gentleman that he is, would never let on. ;)

Anyway, I'm happy to report that I disassembled the knob today and simply found that the inside nut had come loose and nothing was broken. I put it all back together and it's ALL good! :woot:

Thanks for the inputs and when the time comes Angerole will be the way to go.

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