Category: Engine

Engine Cooling Baffle Removal

One minor issue with my engine was that it came from the factory fitted with an optional cooling baffle. This baffle is primarily for installation in an aircraft with a pusher prop configuration, but since my plane is tractor config, I need to remove the baffle to ensure proper...

Engine Transport Success

When I bought the engine way back in December 2020, I planned to bring my plane to the airport to install the engine. I found space inside a community hangar at the Nashua airport, which I where I will perform final assembly. The hangar manager graciously allowed me to...

Firewall Forward Kit Arrival

Last week I received the custom firewall kit I ordered to install the 915iS on my Sling 4. Shipping took a long time – almost 5 months – but I’ve read it’s a widespread issue in sea container shipping right now. Everything in the kit arrived just fine. I...

Aileron Trim Kit

It’s been a little bit since I posted, but there are a few exciting developments to share. First, I got word that my firewall forward kit arrived in Torrance CA last week and is on its way to me! This is the long-awaiting custom kit that will allow me...

Rotax 915iS vs 914UL: Cost and Technical Differences

By request, here’s a breakdown of the technical and cost differences to equip my Sling 4 with a Rotax 915iS engine instead of the Rotax 914UL engine. As a quick reminder of why I’m doing this: +26HP at takeoff power (5800 RPM), +35HP at max continuous power (5500 RPM),...

Engine Arrived

My engine arrived today! This is the Rotax 915iS engine, and as I described in an earlier post, this particular engine is used with just 12 hours on the clock. Even though I bought it locally, it was inspected by Lockwood Aviation down in Florida, as they are currently...

Engine On The Way

Coming soon to my workshop: a Rotax 915iS engine! Those familiar with the Sling lineup know that the 915iS engine normally is found on the Sling TSi, not on a Sling 4. So, my airplane is going to be somewhat unique, but that’s part of what experimental aviation is...

Engine Choices

Here’s what I have to choose from: Notes: NA = Naturally Aspirated EFI = Electronic Fuel Injection 5 min max continuous power (for takeoff) 154HP is the advertised power, but I would probably ask for derated to ~135 HP for compatibility with a Whirlwind propeller Price when purchased through...