Personally I would stay clear of UL Power. I know about the UL520. Not familure with turbo charged version UL520T except for what is on their web page I can say the effective HP or thrust from their engines in not as advertised. It is a complaint of many. They get their claimed HP at 3200 RPM. It is direct drive and that is too much RPM for Prop efficiency. The special prop they use can only do so much. Also it burns as much or more fuel as a Lyc, on HP to Gallon basis.
What is Van's RV-15 engine: "Lycoming IO-390 four-stroke powerplant, driving a 80-inch Hartzell Propeller Trailblazer three-blade, constant-speed propeller. The Lycoming O-360 will be an option." Stick with that, unless you want to make your own engine mount and custom intake, exhaust. deal with a 100 custom design and system installation design and fabrication. More build time for sure.
The UL Power advertised power is optimistic with rated HP by a good bit. I know of an RV7 with UL520 engine. The custom engine mount, CG issues. slower speeds (more like a 160HP) while burning same GPH. Not impressive. In 2019 prices a Lycoming was $10,000 less than UL Power. Now they are about the same. Stick with what Van suggests and has designed the plane for.
Prop on UL is either fixed or a very expensive AIRMASTER electric prop ($15,000) made om Australia. Have a problem good luck. UL power it also made far away in Europe. Give me a Lyc and Hartzell Hydraulic Prop.
Early models of the UL520 had piston and cylinder issues. There is Facebook group for UL Power. There are some pictures of broke internal parts. They sold engines with CAST pistons. They failed. I believe they are using forged pistons now.
If it's ain't Lycoming I ain't going. 3 years ago Lyc prices were $25K to $36K new the UL520 was $38,000 rated at 200HP but really makes 180HP or less. The UL530T I guess is $48,000. Why? More time and Work to build deviating from plans, lower performance and more cost. Why?
Raleigh, NC Area
RV-4, RV-7, ATP, CFII, MEI, 737/757/767
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Last edited by gmcjetpilot : 03-22-2023 at 08:01 AM.