Rotec MKII on Revmaster
Posted: Thu Dec 14, 2023 1:06 pmI'm reviving this old thread but now I'll have to call it 'MKII on Revmaster" since the AeroInjector is shelved and replaced by the Rotec.
My original goal was to be able to use the installed RV snout (pics in earlier posts above) for cool ram-air but turned out that was not very compatible with the AeroInjector nor the RevFlow carb either. Fast forward to yesterday's ground test. I now have the Rotec MKII installed and tuned (flown twice), and since the Paul at the factory told me ram-air on the MKII would work fine, the next step was to plumb the MKII to the snout. Did a tied-down full throttle test yesterday which showed not only 3100 rpm (same as before) but the max fuel flow actually increased from 8gph to 8.5 gph. All this with no change in fuel tank venting. So in baby steps I'm working confidently toward a flight test and waiting on drier weather. It's understood that flight speeds may produce different results than just static prop blasts.
To make the connection from the MKII to the snout a 3d part was drawn up and printed from Nylon-6.
It took some time to figure out how to make the connection. Options were to make the connection then close the cowl -or- close the cowl then make the connection. This is what I came up with (pic). I can sort of manipulate the snout-adapter into place while closing the cowl then reach in the front and align it after closing the cowl. The spring scat tube pushes the adaptor into place and holds it. This is nice so when opening the cowl, no special precautions are needed to disconnect the scat. It just pulls out of the snout as shown.
Here is what it looks like from the front. After closing the cowl, a hook is used to give a tug on the adaptor to make sure it is seated then the foam filter is set in place from the outside. The filter, btw, is cut from a Brackett Aero Filter BA6108 which goes on some Cessnas.
I hope to post again about this after a flight test.
My original goal was to be able to use the installed RV snout (pics in earlier posts above) for cool ram-air but turned out that was not very compatible with the AeroInjector nor the RevFlow carb either. Fast forward to yesterday's ground test. I now have the Rotec MKII installed and tuned (flown twice), and since the Paul at the factory told me ram-air on the MKII would work fine, the next step was to plumb the MKII to the snout. Did a tied-down full throttle test yesterday which showed not only 3100 rpm (same as before) but the max fuel flow actually increased from 8gph to 8.5 gph. All this with no change in fuel tank venting. So in baby steps I'm working confidently toward a flight test and waiting on drier weather. It's understood that flight speeds may produce different results than just static prop blasts.
To make the connection from the MKII to the snout a 3d part was drawn up and printed from Nylon-6.
It took some time to figure out how to make the connection. Options were to make the connection then close the cowl -or- close the cowl then make the connection. This is what I came up with (pic). I can sort of manipulate the snout-adapter into place while closing the cowl then reach in the front and align it after closing the cowl. The spring scat tube pushes the adaptor into place and holds it. This is nice so when opening the cowl, no special precautions are needed to disconnect the scat. It just pulls out of the snout as shown.
Here is what it looks like from the front. After closing the cowl, a hook is used to give a tug on the adaptor to make sure it is seated then the foam filter is set in place from the outside. The filter, btw, is cut from a Brackett Aero Filter BA6108 which goes on some Cessnas.
I hope to post again about this after a flight test.