Sheet foam Yak-55 indoor aerobat with carbon reinforcement

Nov 08, 2026 Last reply: 19 hours ago 4 Replies
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Most indoor aerobats around here go the flat profile route, so a full sheet foam airframe stiffened with carbon fiber rods is a different approach to the usual indoor season opener, and it caught my attention right away. That construction choice seems smart to me: foam keeps things light, and the carbon rods should add the stiffness an airframe needs for hard aerobatic loading, though that is my read rather than anything the maker has explained.



The rest of the hardware reads like a tidy indoor package. Power comes from an electric motor and propeller up at the nose, fed by a 2S 550mAh pack, and there is wire landing gear with small foam wheels underneath. The red, white, and yellow graphics give it a proper show-plane look, and the wings carry the text 'VENI VIDI VICI'. The maker flies it with a black handheld transmitter that has dual gimbals, toggle switches, an antenna, and a digital display.



The flying is what stands out. The flight starts with a vertical launch straight into a steady hover, then moves through torque rolls, inverted hovering, tight loops, and high-alpha passes, at one point working close to the wooden ceiling rafters before the plane settles on its landing gear on the floor. The control shown through all of that looks precise to me, especially the hover work near the rafters.



For anyone wanting to reach this level, the maker suggests putting in 15 to 20 minutes a night on Realflight, flying IMAC basic and intermediate sequences, starting with a 32-inch profile foamy like the Crack Yak, and keeping FoamTac handy. One open question: nothing has been said about how long the 550mAh pack lasts in the air, and given all that hovering, I would be curious.


The carbon fiber rods in the sheet foam look like the key decision here. Foam alone would flex too much under the loads of torque rolls and hard pulls, in my view, while carbon adds stiffness without much weight. The trade-off is that a rod-reinforced airframe can snap cleanly in a hard hit instead of denting, which is probably why keeping FoamTac handy is part of the advice.

That vertical launch into a steady hover is the part I keep thinking about. Getting a plane to go straight up off the floor and stop in a controlled hover takes a lot of practice and a well-sorted setup. What path did the maker follow to get to that point, and is there a recommended way for someone starting out on this style of flying?

The maker laid out a path for this: spend 15 to 20 minutes a night on Realflight, fly the IMAC basic and intermediate sequences, and start with a 32-inch profile foamy like the Crack Yak before moving up. The other piece of advice was to keep FoamTac close at hand, since foam repairs come with the territory in this kind of flying.

A concrete next step for anyone building something like this: take the maker's own suggestion and run the IMAC basic sequence with the plane before chasing the showy stuff. Flying a set pattern would expose any slop in tracking and rollout, which matters when the end goal is tight loops and high-alpha passes close to the rafters. Precision first, then the hover tricks get easier.

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