Official Nexa 1400mm DH.82 Tiger Moth Biplane - British Camo (Balsa ARF) Discussion Thread

[Evan D]

You did read the required accessories? Your power system is significantly lighter than the items listed. And less powerful. If it was me and I needed to add usless weight I'd go even bigger on motor, it's the most forward item.

REQUIRES:

• 6 Channel radio - select a minimum 6 channel radio from our Radio Collection
• 6 Channel receiver - select a minimum 6 channel receiver from our Receiver Collection
• .50 size brushless outrunner motor - we recommend the Admiral GP5 4220-770kV Brushless Motor
• 85 Amp brushless ESC - we recommend the ZTW Mantis 65A ESC with 5A SBEC
• 2x 17g standard servos for ailerons - we recommend TWO Hitec HS-85BB High Torque Micro Servos
• 2x 45g standard servos for elevator and rudder - we recommend TWO Hitec HS-485HB Deluxe Ball Bearing Karbonite Gear Standard Servos
• 4 Cell 14.8V 4000 - 5000 mAh LiPo Batteries - we recommend the Admiral 5000mAh 4S 14.8V 40C LiPo Battery with XT60 Connector
• Electric propeller - we recommend the APC 12x6 Thin Electric Propeller - Black

Looking for a little insight. I bought the Nexa DH.82 Tiger Moth British Camo 1400mm (55") Wingspan - ARF and fitted it with a RimFire 32, 60A ESC, 4S-4000 lipo. The plane is so tail heavy that even with the firewall cut to allow the 4S-4000 all the way to the front of the cowl, replacing the small standoffs with 1/4-20 screws, a 4 ounce brass prop hub, I still need about 6 to 8 ounces of lead behind the engine before it balances at the recommended CG. This ends up making the 6.5 pound plane closer to 8+ pounds. At that weight, how will this thing fly?



I just did, and yeah, I feel like I was ambushed. This plane needs extensive rework. I'll probably strip the covering off and try lightening the tail section. They must have started using not so light, light ply in their construction and failed to care about redesigning for this flaw.

[tomsza]

What they need to do is adjust their weight and/or design and materials. This is not a 6.5 pound plane. A bigger motor in the nose (your suggested motor 10.2gr vs 7.8 gr for the RF32) just means less lead in the nose, but it will still need to be an ~8 pound plane (with the firewall hacked up to slide a 4S all the way forward) to come close to it's CG. Without hacking up the firewall to extend the battery forward, I estimated another ~4 ounces of lead needed. This is also leaving the pilot bust off. And at that flying weight, the landing gear will take a real beating. The Rimfire 32 I tested might be on the small side, but it still outputs 747w with a 12x8 on a 4S (6.3 pounds static thrust) and 1011w with a 13x10 on 4S (6.9 pounds static thrust). Easily scale power for a 6.5 pound plane like they advertise.

That's a 1/2 pound of lead sitting on the cowl, and the motor has a 4 ounce brass prop hub and 1/4-20 standoffs that you don't see. Notice where the battery is in the cowl. And the fact that it is still slightly tail heavy at the recommended CG (laser level line).

[bdarnell]

Could anyone tell me if a Satio FG 20 will work well with this plane?