Wishing you and yours, a happy, safe and RV filled weekend!
v/r,dr
Daily RV Pic …robber
RNB …RV-10
Weefle’s DIY RV-10 Visor
“…I’m cheap so what I did was embedded a wing nut in the cabin top pillar on each side then glassed them in. I then bought the Ram visors, balls and short arms on Amazon. I trimmed them a tad so they would fit better. They sit out of the way and seem to work when needed.
If you drill holes in plain don’t use a normal drill bit. Either buy one for plex’s or grind a regular bit otherwise you risk cracks at the holes.”
Foam to Part ….DanH collage
Things that Make Red Cube Perform WeirdFailure Data …TS Flightlines reply
. Bill and others. Since we started plumbing solutions for the FT60 flow transducer, we had always heard that there were some 'strange' failures. Thats one of the reasons we undertook 2 different plumbing solutions. What was strange to us, was we could have several installs of the same type and no issues and longevity, and others would have some crazy anomalyies. ( how about only failing around 4000AGL, not 4500 and above, not 3800 and below, 4000) . We were really stumped, since we knew the plumbing was good, and the testing we had done on flying aircraft doing aerobatics didnt have the anomalies. We theorized that it had to be electrical somehow, but couldnt prove it. Thats because all the installs were done by different builders, with different skill levels, tools, procedures, etc. We pretty much proved that pushing fuel through it under pressure was better, and in the case of our mounting at the flow divider, pushed the fuel vertically, and at the same time any potential air bubbles that might have been present. With many of those installs flying with no anomalies, we were convinced it was electrical. I even had a conversation with Dave Arata at EI about this--(Dave if youre out there, Hey!). That conversation was mainly about trandsducer orientation, and the 'wires up' guidelines. (What happens when you are in a 45* or 90* bank, or inverted: the wires arent up, and the unit continues to work just fine).
.
Our friend Dan Hortons wonderful autopsy of a FT60, convinced use that the anomalies HAD to be electrical. The VERY small wires (about .025 with twisted) might be creating the issues, especially if there was not sufficient strain relief in the harness, and actually breaking the wires underneath the heat shrink at the cube body. I DONT KNOW THAT FOR A FACT, but on 2 failures that was the case. So we suspected the wire connections into an airframe harness was the most probable root cause of the anomalies. And not necessarily the location, or the plumbing, (although some obviously better than others). As for plumbing, again, we found that pushing fuel under pressure through the transducer was better that pulling it through on the suction side, where air bubbles or any other disruption in flow could create a signal variance. We knew that the stock RV10 had the unit in the tunnel downstream from the boost pump, and upstream from the mechanical pump. We once the boost pump was deactivated, the flow changed to a suction function for the mechanical pump, and it 'could' have some variances due to age, diaghrams, check valves, loose connections, etc. So we made an optional change to move the transducer out of the tunnel to a location downstream from the mechanical pump, so fuel would be under constant pressure. We had RV10/IO540 builder ask why we didnt put the transducer at the flow divider like our 4 cylinder version. Pretty simple----different flow divider mounts made it difficult to know what each engine builder used, and we didnt want each customer to potentially have to change all the injector plumbing around. So we chose a location near the mechanical pump, that ANY engine or induction system could use. The electrical was still up to the builder to assure of positive connections and sufficent strain relief in the cube harness.
OFF TOPIC:
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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
Daily RV Pic …robber
RNB …RV-10
Front seat removal
I want to install the Aerosport seat levers but can't figure out how to remove the front seats. How is this accomplished?
vansairforce.net
Weefle’s DIY RV-10 Visor
“…I’m cheap so what I did was embedded a wing nut in the cabin top pillar on each side then glassed them in. I then bought the Ram visors, balls and short arms on Amazon. I trimmed them a tad so they would fit better. They sit out of the way and seem to work when needed.
If you drill holes in plain don’t use a normal drill bit. Either buy one for plex’s or grind a regular bit otherwise you risk cracks at the holes.”
RV-10 Sun Visor
I am at the point of finishing the cabin columns on my RV-10 and want to install sun visor mounts. I was planning to go with the Blue Sky visors, since they were smaller and cheaper than the Rosens, however Blue Sky apparently went out of business and the visors are no longer available. Does...
vansairforce.net
Foam to Part ….DanH collage
parts under cowling: heat resistance / flammability
I am currently designing an oil cooler duct to make the oil cooler more effective. I would use PET-CF as the filament due to its high heat resistance (stable up to 205°C, melting point 250°C). In terms of heat resistance, there isn’t much more available in the consumer sector. Other users have...
www.vansairforce.net
Things that Make Red Cube Perform WeirdFailure Data …TS Flightlines reply
. Bill and others. Since we started plumbing solutions for the FT60 flow transducer, we had always heard that there were some 'strange' failures. Thats one of the reasons we undertook 2 different plumbing solutions. What was strange to us, was we could have several installs of the same type and no issues and longevity, and others would have some crazy anomalyies. ( how about only failing around 4000AGL, not 4500 and above, not 3800 and below, 4000) . We were really stumped, since we knew the plumbing was good, and the testing we had done on flying aircraft doing aerobatics didnt have the anomalies. We theorized that it had to be electrical somehow, but couldnt prove it. Thats because all the installs were done by different builders, with different skill levels, tools, procedures, etc. We pretty much proved that pushing fuel through it under pressure was better, and in the case of our mounting at the flow divider, pushed the fuel vertically, and at the same time any potential air bubbles that might have been present. With many of those installs flying with no anomalies, we were convinced it was electrical. I even had a conversation with Dave Arata at EI about this--(Dave if youre out there, Hey!). That conversation was mainly about trandsducer orientation, and the 'wires up' guidelines. (What happens when you are in a 45* or 90* bank, or inverted: the wires arent up, and the unit continues to work just fine).
.
Our friend Dan Hortons wonderful autopsy of a FT60, convinced use that the anomalies HAD to be electrical. The VERY small wires (about .025 with twisted) might be creating the issues, especially if there was not sufficient strain relief in the harness, and actually breaking the wires underneath the heat shrink at the cube body. I DONT KNOW THAT FOR A FACT, but on 2 failures that was the case. So we suspected the wire connections into an airframe harness was the most probable root cause of the anomalies. And not necessarily the location, or the plumbing, (although some obviously better than others). As for plumbing, again, we found that pushing fuel under pressure through the transducer was better that pulling it through on the suction side, where air bubbles or any other disruption in flow could create a signal variance. We knew that the stock RV10 had the unit in the tunnel downstream from the boost pump, and upstream from the mechanical pump. We once the boost pump was deactivated, the flow changed to a suction function for the mechanical pump, and it 'could' have some variances due to age, diaghrams, check valves, loose connections, etc. So we made an optional change to move the transducer out of the tunnel to a location downstream from the mechanical pump, so fuel would be under constant pressure. We had RV10/IO540 builder ask why we didnt put the transducer at the flow divider like our 4 cylinder version. Pretty simple----different flow divider mounts made it difficult to know what each engine builder used, and we didnt want each customer to potentially have to change all the injector plumbing around. So we chose a location near the mechanical pump, that ANY engine or induction system could use. The electrical was still up to the builder to assure of positive connections and sufficent strain relief in the cube harness.
A unique Red Cube failure mode - and a vulnerability for worse
In the process of tracking down possible causes for serial EI Red Cube sensor failures, with much-appreciated customer support from Advanced Flight, I was able to determine that the apparent loss of at least two of my last 3 cubes (I didn't save the first one after it "died") was not a failure...
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
