Today's Message Index:
----------------------
1. 02:12 AM - Re: Hacman Gen 3 Mixture Control (Remi Guerner)
2. 07:47 AM - Re: Blister on composite structure (h&jeuropa)
3. 08:02 AM - =?UTF-8?B?UmU6IEV1cm9wYS1MaXN0OiBSZTogTW9ub3doZWVsIGJyYWtlIGZpbGzDouKCrOKEom7Dog==?= =?UTF-8?B?4oKs4oSiYmxlZWQ=? (Peter Zutrauen)
4. 09:01 AM - Re: Blister on composite structure (Remi Guerner)
5. 12:42 PM - Re: Hacman Gen 3 Mixture Control (rparigoris)
6. 02:11 PM - Re: Climb =?UTF-8?Q?angle=3F? (davidjoyce@doctors.org.uk)
7. 03:05 PM - Re: Climb angle? (Pete)
8. 03:31 PM - Hac-man gen 3 mixture control (crouton)
Message 1
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| Subject: | Re: Hacman Gen 3 Mixture Control |
Hello Kingsley,
One reason for a higher fuel flow at altitude for the same MAP and RPM is that
your engine is developing more power. Taking your example, full throttle/20" means
you are at around 10000 ft. At this altitude, the outside temp is minus 4,5C
(standard atmosphere) This is almost 20C less than at sea level. Then your
engine is developing 7% more power (293/273). The Rotax runs richer at altitude.
Based on my experience, this over rich mixture increases the fuel consumption
about 10% at 10000ft compared to low altitude at the same power. You say your
fuel flow is 40% higher: that is surprising and I assume your flow meter is
not accurate.
I do not have any experience with the Hacman, but I have done some testing on my
912ULS with my own mixture system (using an electric pump to suck pressure out
of the carb bowl vents). The system worked fine, was fail safe, but there was
no power gain at full throttle at altitude. This was disappointing and I decided
that the possible 10% fuel saving was not worth the additional complexity.
Remi
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=493766#493766
Message 2
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| Subject: | Re: Blister on composite structure |
Remi,
Use peel ply on the area. You may have to color sand afterwards too.
Jim & Heather
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=493775#493775
Message 3
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| Subject: | =?UTF-8?B?UmU6IEV1cm9wYS1MaXN0OiBSZTogTW9ub3doZWVsIGJyYWtlIGZpbGzDouKCrOKEom7Dog==?= |
=?UTF-8?B?4oKs4oSiYmxlZWQ=?
thx! (just saw this, as google is throwing posts into my spam folder after
there were a few legitimate one sadly)
On Mon, Dec 2, 2019 at 7:26 AM Hitchflight <bobhitchcock@icloud.com> wrote:
>
>
> Hi Pete.
>
> I was given the advice below by a Club member who is sadly no longer with
> us. I have personally used this method successfully for many years.
>
> =94=94=94=94=94=94=94=94
=94=94=94=94=94=94=94=94
=94=94=94=94=94=94=94=94-
>
> Bleeding the brakes on the XS MONOWHEEL
> Screw the alu reservoir into the filler hole on the master cylinder. Then
> fill the syringe with fluid, attach a short length of plastic tubing, and
> attach to the bleed nipple on the slave cylinder. Slacken the bleed nippl
e
> and inject the fluid. When all 10 mls are injected, tighten the bleed
> nipple, refil the syringe and repeat. It takes 2 - 3 10 ml syringes to fi
ll
> the system. When fluid with no air bubbles flows into the reservoir,
> tighten the bleed nipple and remove some fluid from the reservoir until i
t
> is about a third full. Then pull the brake lever until no more air is
> expelled. Release the lever slowly and watch the level of fluid in the
> reservior as it drops to make sure no air is sucked into the master
> cylinder. Repeat until no more air is expelled from the master cylinder.
> Finally pull the brake lever back just a quarter of an inch, empty the
> reservoir with the syringe, and release the brake lever, so that the flui
d
> level drops just below the filler hole in the ma!
> ster cylinder. That then lets you unscrew the reservoir without brake
> fluid leaking everywhere. Replace the filler cap, check the bleed nipple
is
> fully tightened, and the system should be bled.
>
> Need Allan keys [Idea]
>
> =94=94=94=94=94=94=94=94
=94=94=94=94=94=94=94=94
=94=94-
>
> This information is probably worth adding to our Europa website. Will
> check with the experts on the Committee and if OK will add.
>
> Regards
>
> Bob
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=493703#493703
>
>
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>
>
Message 4
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| Subject: | Re: Blister on composite structure |
Thanks Jim, I will do the repair when hangar temperature and humidity allow.
Remi
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http://forums.matronics.com/viewtopic.php?p=493780#493780
Message 5
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| Subject: | Re: Hacman Gen 3 Mixture Control |
Hi Kingsley
Carburetors mix fuel to air by volume of air. Going up in altitude decreases the
number of air molecules per given volume of air a lot more than the decrease
in temperature. Thus since there are less air molecules for a given amount of
fuel the mixture will be richer than optimal. I will speak general but often
full throttle will provide a richer mixture than less than full throttle. The
reason is to cool the fire by throwing more gas on it! I have a 914 which complicates
the life of the poor Bing type 64 constant depression carbs but am installing
a Hacman that will work on the 914. Have not yet tested but should be
fine. Mind you if you have control of mixture it can be a good thing, but if you
run hard and lean that can be a terrible thing. If you lean at altitude when
you come down or pull the throttle it will be leaner than desirable so you will
need to add this extra bit to your piloting tasks.
see Mixture 1 and 2
http://www.europaowners.org/main.php?g2_itemId=27305&g2_page=2
I am installing 2 EGTs and a Split Second monitor. It uses a O2 sensor to drive
it. It allows you to monitor mixture. Unlike a fuel injection system that needs
very fast response time of the O2 sensor, using one in this capacity only needs
a very slow response time. Thus even using Leaded Fuel, should be able to
get 100 hours out of O2 sensor from what I'm told.
Ron P.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=493790#493790
Message 6
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| Subject: | Re: Climb =?UTF-8?Q?angle=3F? |
Pete I doubt it is quite that much, at least at max AUW. With my 914 I
get 1400fpm climb at 70 kts which is around 12 degrees. Regards, David
Joyce, GXSDJ
On 2019-12-11 00:45, Pete wrote:
>
> I'm doing my fuel flow testing for my import inspection, and was wondering what
the max climb angle of a classic 912s is. Is 13deg in the ballpark?
>
> Cheers and thx,
> Pete
Links:
------
[1] http://www.matronics.com/contribution
[2] http://www.matronics.com/Navigator?Europa-List
[3] http://forums.matronics.com
[4] http://wiki.matronics.com
Message 7
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| Subject: | Re: Climb angle? |
Thx David for confirming!
Thats a rocket ship. I just guessed on the conservative side to avoid any ar
gument with the inspector, as i found the test to be pain. :)
Cheers
> On Dec 12, 2019, at 5:18 PM, davidjoyce@doctors.org.uk wrote:
>
> =EF=BB
> Pete I doubt it is quite that much, at least at max AUW. With my 914 I get
1400fpm climb at 70 kts which is around 12 degrees. Regards, David Joyce, G
XSDJ
>
>
>
>
>> On 2019-12-11 00:45, Pete wrote:
>>
>>
>> I'm doing my fuel flow testing for my import inspection, and was wonderin
g what the max climb angle of a classic 912s is. Is 13deg in the ballpark?
>>
>> Cheers and thx,
>> Pete
>> .matronics.com/contribution
>> ttp://www.matronics.com/Navigator?Europa-List
>> ics.com
>> .com
>> .matronics.com/contribution
>>
>>
>>
Message 8
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| Subject: | Hac-man gen 3 mixture control |
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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