Major-Tom
Active Member
Late change of plans....
Since October 2018 I am building a RV-12is. The built comes along very nicely and without any problems. The kit quality is great and with excellent engineering down to the smallest details. What helps a lot to keep a steady pace while building, are the complete and accurate construction manuals. So best to do exactly like Vans says, when you want a quick built. That is the pure truth and I did until the avionics and engine kit. General electric and MGL / Trig Avionics was fun to do. Now the firewall is ready to hang the engine. My RV-12iS was supposed to get a carburated Rotax 912 ULS engine. It has all the fuel lines, the gascolator, the faccet fuel pump installed like in the plans chapter 27U for RV-12iS/912ULS. All electric cables and flight control cables and tubes are completely installed on top the fuel lines in the center tunnel. Now it comes: one week ago I was able to get my hands on an almost brand new 912iS Sport. It has 2 hours on it, but was sitting in a box for 6 years. Since I am building something like full experimental ( E-AB instead of ELSA) I have all the options:
1. remove all flight controls, cables etc. that are in the way to get to the fuel lines. Remove the complete fuel system. Then place a big order at vans and start all over with chapter 27iS.
2. leave all like it is. The fuel lines stay, the gascolator acts as drain point and coarse filter. Even the boost pump stays in and wired. Start with the modifications at the two blue AN6 fittings at the firewall. Place the fuel pump duo, the fine filter and the bypass at a low position firewall forward. The faccet fuel pump could provide 5psi and 30 - 40 Gph if vapor look should ever be a problem and does not slow the fuel flow when inactive. I am not sure if the Vans gascolator can provide the 25 Gph needed for the 912iS. But it should be more than enough???
3. leave the return line in but remove the supply side of the fuel system. Make a new fuel line from the tank direct forward to a shut off valve and a gascolator firewall forward mounted, like it is done and proven concept in all the RV-12 before the iS Upgrade. Fuel pumps etc. firewall forward.
What do you think? Most interesting: what did people do, who installed alternative engines like Viking or UL-Power?
Thanks for you input.
Since October 2018 I am building a RV-12is. The built comes along very nicely and without any problems. The kit quality is great and with excellent engineering down to the smallest details. What helps a lot to keep a steady pace while building, are the complete and accurate construction manuals. So best to do exactly like Vans says, when you want a quick built. That is the pure truth and I did until the avionics and engine kit. General electric and MGL / Trig Avionics was fun to do. Now the firewall is ready to hang the engine. My RV-12iS was supposed to get a carburated Rotax 912 ULS engine. It has all the fuel lines, the gascolator, the faccet fuel pump installed like in the plans chapter 27U for RV-12iS/912ULS. All electric cables and flight control cables and tubes are completely installed on top the fuel lines in the center tunnel. Now it comes: one week ago I was able to get my hands on an almost brand new 912iS Sport. It has 2 hours on it, but was sitting in a box for 6 years. Since I am building something like full experimental ( E-AB instead of ELSA) I have all the options:
1. remove all flight controls, cables etc. that are in the way to get to the fuel lines. Remove the complete fuel system. Then place a big order at vans and start all over with chapter 27iS.
2. leave all like it is. The fuel lines stay, the gascolator acts as drain point and coarse filter. Even the boost pump stays in and wired. Start with the modifications at the two blue AN6 fittings at the firewall. Place the fuel pump duo, the fine filter and the bypass at a low position firewall forward. The faccet fuel pump could provide 5psi and 30 - 40 Gph if vapor look should ever be a problem and does not slow the fuel flow when inactive. I am not sure if the Vans gascolator can provide the 25 Gph needed for the 912iS. But it should be more than enough???
3. leave the return line in but remove the supply side of the fuel system. Make a new fuel line from the tank direct forward to a shut off valve and a gascolator firewall forward mounted, like it is done and proven concept in all the RV-12 before the iS Upgrade. Fuel pumps etc. firewall forward.
What do you think? Most interesting: what did people do, who installed alternative engines like Viking or UL-Power?
Thanks for you input.