"Hi Douglas, I saw your post from back in 2016 where you installed the return fuel line for your UL engine on the same end as your supply line. I built a 750 with the UL engine and the fitting was on the outboard end of the tank and easy…"
Hi Douglas, I saw your post from back in 2016 where you installed the return fuel line for your UL engine on the same end as your supply line. I built a 750 with the UL engine and the fitting was on the outboard end of the tank and easy to plumb. Now I am building a 650 and it will be much easier to plumb if I copy what you did. I had heard some discussion that it was better to put the hot return fuel on the opposite end from supply to give it more time to cool. Can’t think that is a problem, but wanted your opinion on how it has worked?
Many thanks. I think I am going through the same process you set out in the last three sentences of your reply.
Since I don't know how to add an image to this comment, I am adding an image of the Composite Designs UL Power Panel to my original post about the Kavilco cylinder head probes to see if the panel looks familiar to you.
There are all of these leads coming from the UL power ECU (see page 40 of the UL Power Installation DVD), some of which, I presume will be used by the Dynon.Then you have the Dynon EMS sensors some of which will have to rely on UL Power information. Finally you have the Composite Design UL Power panel and regular SP 2 panel.
What added to my confusion was--which I finally figured out--was the role of the Dynon oil pressure, oil temperature and fuel pressure sensors. I think I have figured out that those sensors are solely for Dynon use, and that UL Power has similar sensors that are controlled by the FADEC but are not accessible to Dynon
However, having understood (I think) the role of the Dynon sensors, I still do not have a way of figuring out how the fuel flow information from the UL Power ECU is sent to the Dynon. In Jon Croke's UL Power/Zenith 650 DVD, Gus Warren adds two red Dynon fuel flow sensors to the engine. Roger Dubbert says that those data are now available for use by Dynon . I don't know which of the two UL Power leads to connect to Dynon.
So, with this as background a few questions: Is there a preferred method of connecting the small diameter wires to each other?
2)On page 40 of the UL Power DVD is says to pull all five ground wires together. Does this mean they stay together, or are they distributed further. Do they go the the aircraft ground to to the Composite Design UL Power?
3) "Pull all six positive wires together to a switch, install a 20 amp fuse and 14 ga wire?
Do these wires go to the Composite Design UL Power panel?
4) Is it possible to use Dynon wire lead to the oil temperature switch without a heat covering?
5) I presume the items in number 6 also go to the Composite Design UL Power Panel.
As an aside, unlike Jon's DVD an the Zenith pdf. insructions, I think it would have been better to mount the voltage regulator on the firewall using using the same SCAT cooling ducting from the cylinder head baffles since the length of the alternator wires would allow this and the + and - wires would have been much shorter.
So, I am slowly figuring out these things, but thought I would let you know where I am.
Developed specifically for Zenith builders (by a builder) these videos on DVD are a great help in building your own kit plane by providing practical hands-on construction information. Visit HomebuiltHelp.com for the latest DVD titles.