Throttle quadrant - reverse?

A forum about all aspects of the construction and maintenance of the Billy Dawson inspired modified Hatz Classic biplane. Here is the place to ask your questions and get the answers from the real experts.
orchardair
Posts: 215
Joined: Thu Apr 08, 2010 4:56 pm

Throttle quadrant - reverse?

Post by orchardair »

Hi All,
I like the throttle quadrant design (sheet #27), but the more I think about it, the less sense it makes to me:
In my current airplane, and in most planes I have seen, there is no reversal of the throttle and mixture controls - push forward means full throttle / rich mixture.
The throttle quadrant design on page 27 shows that when you push the throttle level all the way forward, the control will reverse and pull the cable all the way back.
seems like this is what we need:
no reversal.JPG
What have others done?
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Hatz Classic plans# 136
alvinsager
Posts: 89
Joined: Thu Mar 18, 2010 10:29 am

Re: Throttle quadrant - reverse?

Post by alvinsager »

Hi,
My Lauzon fuselage for my CB-1 had a bracket welded to the upper longeron, about a foot aft of the firewall, which I used for a reversing belcrank. From there I used a flexible cable to the carb. I may be able to get a picture if you would like to see it.
Al
orchardair
Posts: 215
Joined: Thu Apr 08, 2010 4:56 pm

Re: Throttle quadrant - reverse?

Post by orchardair »

Al,
Thanks for the reply.
This reinforces my thought that the throttle quadrant which is included in the drawings of the Classic will require a reversal. Seems like it would be better to design the reversal into the throttle (like the one in the picture I attached in my original post) to begin with. The way I see it there are two options that will work:
throttles.jpg
Forgive the crude drawing, it is for conveying the idea only. Option B would save some weight.
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Hatz Classic plans# 136
orchardair
Posts: 215
Joined: Thu Apr 08, 2010 4:56 pm

Re: Throttle quadrant - reverse?

Post by orchardair »

I knew the internet would help. Here's Rick Hansen's solution:
reversingThrottle.JPG
interconnect the two cockpits below, and connect to carburetor above the pivot point.
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Hatz Classic plans# 136
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Ebby
Posts: 109
Joined: Wed Mar 17, 2010 7:32 pm
Location: Camden NY

Re: Throttle quadrant - reverse?

Post by Ebby »

image.jpg
image.jpg
Here is what I did. Pictures worth a thousand words.
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Ebby
Hatz Classic S/N 37
Flying!
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