# Recent content by Will Aldridge

1. ### Optimizing fairings for local airflow

Well just for grins I drew a Helix on my cad model of the path of my prop tip (72" diamter) traveling 100 mph at 2800 rpm. I imagine the relative wind would straighten the airflow out to some degree but still looks like some potential for optimization although looking at that image I would guess...
2. ### Optimizing fairings for local airflow

I guess the FAA has it wrong then since the attached image came from an FAA handbook. The prop slipstream spirals around the fuselage and impacts one side of the vertical tail (1 factor of the left turning tendencies inherent in prop driven aircraft).
3. ### Optimizing fairings for local airflow

I don't see how it's really any different than the way things are already done. The wing and tail incidence are set to be most efficient at a certain airspeed, likewise the AoA of fairings is ideally set to be 0 at cruise speed. It may well be that the performance gains are too small to justify...
4. ### Optimizing fairings for local airflow

In another thread Pops mentioned that he faired the gear legs and cabane on one of his aircraft but did not realize any speed increase. I've been thinking about this for awhile and wondering why that might be. I'm hoping one of you with a flying aircraft might be willing to test my hypothesis...
5. ### My foam cutter

It's been close to 10 years so I might remember wrong but I think I bought the electrical "kit" from ACS, but as you can see the heat control is just a dimmer switch. Not sure what the other electrical doohickey is called.
6. ### Full Vinyl wrap?

Like I said the details are fuzzy. The gentleman who related the story was near retirement and quite experienced, so that lends credibility. Also that particular aircraft if I remember correctly was one he worked on before coming to that company so possibly a small operation with just the one...
7. ### Full Vinyl wrap?

I have a question. Have any of you heard about vinyl wrap causing issues with radios/avionics? About 6 years ago I worked for an air ambulance outfit in Alaska and one day the avionics guy told me how a plane was having issues with either the radio or something to do with the avionics. It's...
8. ### Build supplies under the clouds

I just recently received some 5052 aluminum sheet for the new fuel tanks I'm building. Their automated system quoted shipping at $170 (by truck). I had the sheet cut up into pieces that fit in a 4' x 2' box and shipping ended up being about$50. Just make sure you fill out the special...
9. ### Compression member location?

Funny thing you can ponder a question for a couple weeks, then ask someone else and have the answer occur just as, or very shortly after you ask it. I came to the same conclusion as TFF. That piece of structure has more to do when the wing isn't bolted to the fuselage.
10. ### Compression member location?

I've been comparing Avid/kitfox (tube spar) wings with SuperCub wings (extruded aluminum I-beam) and have a question, hopefully I won't get roasted too bad for asking. I noticed that kitfox wings don't use compression members. My assumption is that is due to the tube spars being strong enough in...
11. ### BMW conversion,

I'm not an electrical engineer so honestly don't know the ins and outs of what this means, but when BMW went from the R1150 to the R1200 they made it a CAN bus control system that makes it unsuitable for aircraft as a single fault is enough to shut everything down. Not what you want in an...
12. ### Kitfox fuel system questions

An Avid owner/ pilot just posted this on Facebook: https://drive.google.com/file/d/1yE-2b3Ue8q75Yl-niMERzXNU6nZ6yGRt/view?usp=drivesdk It's good thoughts on how to set up a fuel system with 2 wing tanks and a header tank (highwing aircraft). At minimum good for a debate.
13. ### BMW R1150

In the attached catalog page 12 has the exhaust system. I can't use their muffler with my setup so I would only be interested in the header pipes, but not sure if they would sell them separately. Page 17 I think is the intake/ cooling plenums. I looked up the French word "ecopes" which means...
14. ### BMW R1150

It's an Airtrikes SPG-4 gearbox with about a 3:1 ratio.
15. ### BMW R1150

Thanks I'll look and see if I can find part numbers. I found them last year but will have to find them again.