Today's Message Index:
----------------------
1. 07:26 AM - Re: 1.5 degrees right? (jonathanmilbank)
2. 08:00 AM - Re: Re: 1.5 degrees right? (Roger Sheridan)
3. 11:33 AM - Re: Re: Lightweight rechargeable battery backup unit (Alan Burrill)
4. 12:06 PM - Re: Re: Lightweight rechargeable battery backup unit (Kevin Challis)
Message 1
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| Subject: | Re: 1.5 degrees right? |
After 4 months of working in a freezing hangar, I finally flew my aircraft again
a few days ago. The engine is now mounted pointing 1.5 degrees right as per
the XS build instructions, whereas hitherto it was mounted pointing straight ahead
on the Classic frame.
Using the same power settings in the cruise there is no discernible difference
in performance and instead of the ball sitting half out to the right, it now sits
very slightly left. During take-off or go-around there is noticeably less
tendency to swing left when full power gets applied.
Nev Eyre's cowls do a superb job of cooling, to the extent that I've had to blank
off part of the radiator core with Gorilla tape to make both oil and coolant
temperatures run at about 90C in the cruise. Perhaps I'll fit a coolant thermostat
some day. The oil temperature seems just about right without blanking off
the core, because I took Nev's good advice and used the smaller oil cooler
from the Classic installation.
Altogether a good result.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=467541#467541
Message 2
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| Subject: | Re: 1.5 degrees right? |
Nice one Jonathan, would like to see a picture sometime.
Cheers,
Roger
> On 23 Mar 2017, at 14:25, jonathanmilbank <jdmilbank@yahoo.co.uk> wrote:
>
>
> After 4 months of working in a freezing hangar, I finally flew my aircraft again
a few days ago. The engine is now mounted pointing 1.5 degrees right as per
the XS build instructions, whereas hitherto it was mounted pointing straight
ahead on the Classic frame.
>
> Using the same power settings in the cruise there is no discernible difference
in performance and instead of the ball sitting half out to the right, it now
sits very slightly left. During take-off or go-around there is noticeably less
tendency to swing left when full power gets applied.
>
> Nev Eyre's cowls do a superb job of cooling, to the extent that I've had to blank
off part of the radiator core with Gorilla tape to make both oil and coolant
temperatures run at about 90C in the cruise. Perhaps I'll fit a coolant thermostat
some day. The oil temperature seems just about right without blanking
off the core, because I took Nev's good advice and used the smaller oil cooler
from the Classic installation.
>
> Altogether a good result.
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=467541#467541
>
>
>
>
>
>
>
>
>
Message 3
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| Subject: | Re: Lightweight rechargeable battery backup unit |
I'm not an LAA Inspector only an electronics engineer but from an aviation perspective
I would be considering if the unit emits any RF Noise in the VHF and 1030/1090MHz
band that would cause interference with the operation of the VHF Comms
and Transponder.
If the specifications dont have any reference to interference protection then its
down to someone to bench test one with suitable test equipment to see if thats
the case or - see what happens when next to a VHF Receiver.
For example many cheap USB power supplies emit RF noise from the circuit converting
12v to 5v which break through the mute on a VHF comms receiver. I've also
seen interference from cheap LED lamps used for nose lights do the same thing.
Interference could be either airborne or though the power cables in/out depending
on how suppression for the unit has been designed.
Thats aside from any question that the LAA may have from the use as a fall back
device for power and the possibility of failure in its own right as point of
common mode failure for dependent instruments.
IMHO
Alan Burrill
G-OBJT
> On 21 Mar 2017, at 15:06, BobD <rjd@bobdawson.plus.com> wrote:
>
>
> Hi Kevin,
> Thanks for your reply. I did actually come across this unit in my web search,
but as it says it is for cars, I am not knowledgeable enough to know if it is
also suitable for aviation. It's also from the USA, and I would prefer a UK (or
UK distributed) solution if possible.
>
> It is along the lines of the sort of thing I am looking for, it should be fairly
easy to find an enclosure to house the PCB and battery.
>
> --------
> Bob Dawson
> XS TG || 912 ULS || G-NHRJ
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=467492#467492
>
>
>
>
>
>
>
>
>
Message 4
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| Subject: | Re: Lightweight rechargeable battery backup unit |
The unit I suggested is used by an aircraft instrument manufacturer just covered
over and sold as a package. It's a cost effective way of keeping your efis running
if you lose all power. It was only a suggestion.
Kevin Challis
> On 23 Mar 2017, at 19:32, Alan Burrill <alanb@dpy01.co.uk> wrote:
>
>
> I'm not an LAA Inspector only an electronics engineer but from an aviation perspective
I would be considering if the unit emits any RF Noise in the VHF and
1030/1090MHz band that would cause interference with the operation of the VHF
Comms and Transponder.
>
> If the specifications dont have any reference to interference protection then
its down to someone to bench test one with suitable test equipment to see if
thats the case or - see what happens when next to a VHF Receiver.
>
> For example many cheap USB power supplies emit RF noise from the circuit converting
12v to 5v which break through the mute on a VHF comms receiver. I've also
seen interference from cheap LED lamps used for nose lights do the same thing.
>
> Interference could be either airborne or though the power cables in/out depending
on how suppression for the unit has been designed.
>
> Thats aside from any question that the LAA may have from the use as a fall back
device for power and the possibility of failure in its own right as point of
common mode failure for dependent instruments.
>
> IMHO
>
> Alan Burrill
>
> G-OBJT
>
>
>
>
>> On 21 Mar 2017, at 15:06, BobD <rjd@bobdawson.plus.com> wrote:
>>
>>
>> Hi Kevin,
>> Thanks for your reply. I did actually come across this unit in my web search,
but as it says it is for cars, I am not knowledgeable enough to know if it is
also suitable for aviation. It's also from the USA, and I would prefer a UK
(or UK distributed) solution if possible.
>>
>> It is along the lines of the sort of thing I am looking for, it should be fairly
easy to find an enclosure to house the PCB and battery.
>>
>> --------
>> Bob Dawson
>> XS TG || 912 ULS || G-NHRJ
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=467492#467492
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
>
>
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