AMAZING ONBOARD ! FMS Su-27 Fighter Jet | Dual 70mm EDF | RadioMaster TX16S radio | FrSky X8R RX

AMAZING ONBOARD ! FMS Su-27 Fighter Jet | Dual 70mm EDF | RadioMaster TX16S radio | FrSky X8R RX
AVAILABLE INTERNATIONAL: https://www.fmshobby.com/products/fms-dual-70mm-edf-su-27-j-11-pnp?ref=EssentialRC
AVAILABLE IN US: https://shrsl.com/3v0no
AVAILABLE IN UK: https://www.cmldistribution.co.uk/product/FMS119P/fms-twin-70mm-edf-su-27-artf-blue

We use lipo batteries from 4-Max in the UK from here:
https://4-max.co.uk/batteries.htm

Insta360 GO2 action camera here: https://amzn.to/3Ie8dvB

RADIOMASTER TX16S MK II RADIO/TRANSMITTER AVAILABLE HERE: https://www.radiomasterrc.com/products/tx16s-mark-ii-max-radio-controller?sca_ref=1532879.KTnLWlCJZG

Assembly was very straight forward with the Su-27. A child could assemble it with a little help! It's that easy. Once the FrSky X8R receiver was installed and the TX16S setup it was time to head to the flying field.

Knowing that I would be flying off grass I removed the FOD guard on the nose wheel. With it attached it only exposes about 3mm of the tyre. This is done by removing the C-clip, removing the axle and then removing the two screws holding the wire part of the FOD guard. When putting the axle back use 2 washers to pad it out so the C-clip does not get forced off by the axle moving side to side.

All my current EDF jets use 4-Max 6S6000 60C packs. Although normally larger than the recommended pack size for any jet they provide more power and longer flight times at the expense of some agility due to the additional weight. So I was keen to see if the Su-27 would fly on them off our wet, mildly bumpy, not very short grass at the flying field. I found that the balance point with one of these packs, as far back as possible, was 20-15mm in front of the recommended CG point. For that reason I cut out a section of foam at the back of the battery bay to allow me to move it back another 15mm. I did this while ensuring the battery would not prevent the nose wheel from retracting fully. The CG had moved a little but was still in front of the recommended range. The first two take attempts failed with the nose gear not looking like it would lift off. There is a lot of movement in the nose leg which is perfect for absorbing the bumps on a grass runway. Always the last resort for electric models but out of necessity I then added 30oz of lead to the rear tail section and the 3rd take off attempt was successful but was assisted by a bump half way up the flying field ! Once in the air some up trim was needed for level flight and with one circuit complete I nailed the throttle and put in some progressively low passes. With the speed part of the test complete I cut the throttle and deployed the speed/air brake and made some slow passes for the camera man. Knowing that I had used some battery capacity with failed take offs I opted to put down the landing gear and let the Su-27 slow down before holding up the nose with elevator input and balancing it there with the throttle for a high alpha descent and giving a burst of power on the final flare before touching down the mains and then nose gear.

In conclusion this jet flies extremely well on a 6S5000 pack but the forward CG with this pack does making it difficult to take off from grass unless the other modifications are made. The larger nose wheel gives this jet a more positive angle of attack and really helps it get in the air.

Filmed by Jason for the 'Essential RC' YouTube channel using the Panasonic AG-UX180 4K camcorder at our local model flying club. Onboard action captured using the Insta360 GO 2 action camera.

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