Overview
The reason not to install a Rotax Regulator are covered in detail in a previous blog, and this will be just the nuts and bolts of the exercise.
Installation
The regulator had been fitted earlier, this is covered in a blog, but it was time to hardwire it into the aircraft.
Note: Heat conductive paste was applied before fixing to the S/S firewall, an air blast will be taken from the intercooler air inlet when fitted.
A problem was struck in while the manufacturer's instructions are precise, the wire sizes are not, except a vague mention of the use of 2.5 mm [14 guage] wire. The main reason would appear to be that the text was converted using a translator and some of the results make interesting reading. At this point, an email was sent to John at Dog Aviation, who kindly clarified what he had used in his RV12.
To summerize the wire used:
C = 20 guage [Sence line]
L = 22 guage [Indicator light]
B - 12 guage [Battery]
R= 14 guage [Positive capiciator]
G = 10 guage [Feed from alternator]
All earths used are Black 14 / 12 guage, as required.
The diagram supplied by the manufacturer was followed precisely. Joe the L2 who is part of the team that will approve this aircraft pointed out generally are not fitted but reading the instructions, we interpreted it would be required with an injection system.
Our opinion is the capacitor may assist in removing ripple in the DC produced by the alternator but both of us agreed it would not hurt, and it's available.
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| The capacitor is 50V 33000 farad. |
The final task was to mount the capacitor and it was decided to fabricate one from some scrap aluminium channel.
A piece of 25 x 12 x 1 extruded aluminium channel was drilled to lighten it and a modified work drive clamp to retain the capacitor.
The assembly was fixed to the firewall with two [2] 3.2 mm pop rivets then the edges lined with 10 mm U channel rubber to protect the capacitor.
Note: doing it again the builder would look at milling a slot in the side of the channel and installing a lighter clamp
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The final result was a tidy install showing the clear intent of the wiring
Time for a Snoopy.
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