Creighton,
Like you, I have a 912 (80hp) and a CS prop but as yet, no Hacman. I
fully concur with your statement that the Bings do a good job up to
about 4000 ft and your fuel flow at WOT at altitude of 3.5 GPH is very
much the same as what I get down low on the same power setting.
Your figures are what I would expect at altitude (with leaning) so I am
much encouraged by your experience.
Thank you for your input and I would be interested to know what sort of
tubing you have found to be more reliable please. If I am reading the
Hacman information correctly, I think they may have changed the tubing
type on their Gen 3 unit.
Best regards
Kingsley Hurst
On 13.12.19 9:31 am, crouton wrote:
>
> I have been using a Hacman for several years at this point. The Bings do a
> good
job of keeping the mixture sweet up to about 4000ft (80hp 912).
> On some of my longer legs I have climbed as high as 11500ft and have been able
to keep EGTs up and fuel flows down (WOT and 3.5GPH). Obviously I only fly
this high in order to ride a smoking tailwind.
> The vacuum lines in my kit were aquarium tubing and were not up to engine
> compartment
conditions and had to be replaced with more durable tubing.
> I like the Hacman and the addition of a constant speed prop rounds out the
> package,
Affording better climb, faster cruise, and more consistent fuel flows.
Consistent rpm reduces my tendency toward fugoid of a hundred or so feet which
affects rpm and power.
> Creighton Smith A-009
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