In/out of COMM this week…top-heavy job3 sched. Hope you had a nice weekend. 100* H.I. here. Hello summer ;^).
v/r,dr
dr
petehowell
RE: Testing Fusible Links
…Richard Connell
I used midis on both B leads and have had neither blow as yet. 400h or so. The smaller form factor attracted me to them. I could get my cross tie and starter relay nice and close together on the firewall.
Build Update; PaulvS RV-6
Today I'm down in the detail of fitting the ailerons and flaps to the wings and have encountered some interference between the aileron pushrod and the flap skin leading edge. There is no mention of this issue on the plans, but it seems inevitable.
RE Air temp exiting cowl
…HFS
Another interesting perspective ...
I also have a fire suppression system (beside the point), and use two channels from my EI 16-channel engine analyzer to measure the real time air temps at the distribution spider location and under the sump adjacent to the servo (where I have the nozzles for the suppression material distribution). What these two temps provide is an indication of the efficiency of the downdraft cooling system. When Dave Anders did the design he always maintained that the "delta" T across the cylinders should be in the neighborhood of 60*F+ for adequate cooling.
In almost all flight regimes/seasons, in my airplane, this has proven to be the case. Of course, at shutdown, stagnated heat remains to "cook" whatever is available under the plenum, and I can tell you that the temp around the servo area gets quite high for a little while.
To help solve that problem for me, I live in the Central Valley of California, where the ambient temp in my corrugated tin hangar in the summertime easily reaches 120*F+ on hot afternoons, I built a "huffer", that I plug in after every flight to evacuate the stagnated air. Even though the air temp going in may be 100* or more, that is a significant reduction from trapped air in the plenum that can easily reach temps above 200*F. I run it on an 1 1/2 hour mechanical timer, but in just 10 minutes or less, the evacuation cycle has cooled the area significantly. If you are standing anywhere "south" of the cowling exit you can clearly feel the heat extraction ...
YMMV - but not by much.
RE: Carbon Monoxide in the cockpit
…bjdecker
Seal up holes between the aft most bulkhead flanges and skin in the rudder "cove" below the bottom hinge of the vertical stabilizer...
inktomi
OneTwoTree
OFF TOPIC:
Get your VansAirForce.net Charity Cap!
Please consider donating yearly to help keep this American 1-person pirate ship afloat:
Older issues of the ‘VAF News’ can be found at:
THE VAF LIST (a list of RV-related lists)
v/r,dr
dr
WDYDWYRTW? 6 / 21-22 / 2025
*What did you do with your RV this weekend? Getting this weekend's thread started, and hope you're having a nice one. v/r,dr
www.vansairforce.net
petehowell
Cheapo P-Mag Monitor and DataLogger
I got some help from my old friend Brantel and put together a quick and dirty PMag monitor and SD card datalogger. It even creates a WiFI network to let you manage and download data files. A cheap yellow display ESP32 board($12) and an RS232-->TTL ($2) converter board are all you need. You...
www.vansairforce.net
RE: Testing Fusible Links
…Richard Connell
I used midis on both B leads and have had neither blow as yet. 400h or so. The smaller form factor attracted me to them. I could get my cross tie and starter relay nice and close together on the firewall.
Testing Fusible Links
I have been trying to decide whether to use fusible links, or MIDI fuses FWF for my bus feeds, so decided to do some testing. I welcome all comments and insights! You can see the test and videos here: https://tasrv14.blogspot.com/2025/06/wiring-planning-fusible-link-testing.html Some...
vansairforce.net
Build Update; PaulvS RV-6
Today I'm down in the detail of fitting the ailerons and flaps to the wings and have encountered some interference between the aileron pushrod and the flap skin leading edge. There is no mention of this issue on the plans, but it seems inevitable.
RV-6A Very Slow Build, Western Australia
Nice grin Paul :) The more so enduring the frustration… nice seeing you forging ahead.
vansairforce.net
RE Air temp exiting cowl
…HFS
Another interesting perspective ...
I also have a fire suppression system (beside the point), and use two channels from my EI 16-channel engine analyzer to measure the real time air temps at the distribution spider location and under the sump adjacent to the servo (where I have the nozzles for the suppression material distribution). What these two temps provide is an indication of the efficiency of the downdraft cooling system. When Dave Anders did the design he always maintained that the "delta" T across the cylinders should be in the neighborhood of 60*F+ for adequate cooling.
In almost all flight regimes/seasons, in my airplane, this has proven to be the case. Of course, at shutdown, stagnated heat remains to "cook" whatever is available under the plenum, and I can tell you that the temp around the servo area gets quite high for a little while.
To help solve that problem for me, I live in the Central Valley of California, where the ambient temp in my corrugated tin hangar in the summertime easily reaches 120*F+ on hot afternoons, I built a "huffer", that I plug in after every flight to evacuate the stagnated air. Even though the air temp going in may be 100* or more, that is a significant reduction from trapped air in the plenum that can easily reach temps above 200*F. I run it on an 1 1/2 hour mechanical timer, but in just 10 minutes or less, the evacuation cycle has cooled the area significantly. If you are standing anywhere "south" of the cowling exit you can clearly feel the heat extraction ...
YMMV - but not by much.
Air temp exiting cowl
I installed 2 thermocouplers on the firewall about 10” above the scoop exit for early fire detection. Air temp on the way out was 145/146 while doing pattern work today with an ambient temp of 88f. Thought it might be of interest to those that want to know what temps things on the firewall are...
vansairforce.net
RE: Carbon Monoxide in the cockpit
…bjdecker
Seal up holes between the aft most bulkhead flanges and skin in the rudder "cove" below the bottom hinge of the vertical stabilizer...
Carbon Monoxide in the cockpit
I bought a CO detector and it reads a small level of CO in the cockpit if the air vents are closed. Pulling the cabin heat knob actually decreases the level, but doesn't go away. Is this common with RV's? Anyone else have a CO detector in the cockpit? Thanks.
vansairforce.net
inktomi
Elevator down stop question
Hi! I'm trying to finalize my elevator travel, and have filed the up travel to 28.4 left and 28.1 right (both hitting at the same time, could be some minor measurement difference due to manually centering elevators). I see the max down swing is 25 degrees, and I see that both stops should...
vansairforce.net
OneTwoTree
Transponder and Comm Rack in Tail
Please rate this set up! Give it to me straight. I had an acquaintance many years ago, who tragically lost his life due to a mobile GPS unit falling off the dash and getting jammed in the tail cone of his Extra. So I am trying to do my due diligence when it comes to this area even though it...
vansairforce.net
OFF TOPIC:
Get your VansAirForce.net Charity Cap!
VAF Charity Cap: Help your charity and promote this site.
Get the cap all the cool kids are wearing! I don’t get a penny. It’s around $15. $5 more if you want your N-number on the back (I put 'STAFF' on the back of mine because it makes me laugh. Put STAFF on yours too if it makes you smile). And down the road $10 to the charity of your choice...
vansairforce.net
Please consider donating yearly to help keep this American 1-person pirate ship afloat:
Older issues of the ‘VAF News’ can be found at:
Doug's Area ...The VAF News, About VAF, My Resume
Pushed out every now and then.
www.vansairforce.net
THE VAF LIST (a list of RV-related lists)
THE VAF LIST (a list of RV-related lists)
The VAF List ...a list of RV-related lists. RV-related things you might want to browse over (a closed post that is sticky and maintained by dr). Link to this in 'Links' in the menu. v/r,dr Small businesses that help bring you this list of RV-related lists: 360 Avionics www.360Avionics.com Ace...
vansairforce.net
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