I am intending to install a 5gal smoke oil tank in the back luggage compartment of my RV-8 (need to move the CG back while having some fun with it...).
Looked at Marvin's system and when reading through the installation instructions it says that one can use 4 rive-nuts to attach the tank to the floor ( I would assuming going through the floor AND the flange of the ribs below it).
Now that made me think about how well rive-nuts actually work as I do fly my RV within it's full envelope once a week... . I am not an expert by any means but would never have thought to use rive-nuts for structural purposes.
The tank full with oil, pump etc. should be in the 40-45lb range. I would suppose on positive loads it shouldn't matter as the rive-nuts don't have to hold anything in that case. That leaves side loads (e.g. snap roll) or negative loads.
As my max negative load is -3G which should put the ultimate load to -4.5G. Let's add 10% for good measure making it -5G.
So that would mean the 4 rive-nuts would have to hold about 250lb on pull. Not sure what a realistic side load would be. As I have little concern that they would hold this once I am a little bit worried that adding/removing that load frequently as one does flying would eventually lead to failure.
Are my concerns justified?
Also what size rive-nuts would one use as they obviously have to be small enough to have sufficient edge distance on the flange of the rib in the floor but large enough to hold the load.
Oliver
Looked at Marvin's system and when reading through the installation instructions it says that one can use 4 rive-nuts to attach the tank to the floor ( I would assuming going through the floor AND the flange of the ribs below it).
Now that made me think about how well rive-nuts actually work as I do fly my RV within it's full envelope once a week... . I am not an expert by any means but would never have thought to use rive-nuts for structural purposes.
The tank full with oil, pump etc. should be in the 40-45lb range. I would suppose on positive loads it shouldn't matter as the rive-nuts don't have to hold anything in that case. That leaves side loads (e.g. snap roll) or negative loads.
As my max negative load is -3G which should put the ultimate load to -4.5G. Let's add 10% for good measure making it -5G.
So that would mean the 4 rive-nuts would have to hold about 250lb on pull. Not sure what a realistic side load would be. As I have little concern that they would hold this once I am a little bit worried that adding/removing that load frequently as one does flying would eventually lead to failure.
Are my concerns justified?
Also what size rive-nuts would one use as they obviously have to be small enough to have sufficient edge distance on the flange of the rib in the floor but large enough to hold the load.
Oliver