The weight of a Belite 254

If you were around our workshop on a daily basis, would see that we are constantly weighing things. We are passionate about reducing weight, staying legal, and increasing utility in the design of our Belite 254 Carbon Fiber ultralight aircraft.

I weighed the Belite 254 demonstrator aircraft on certified aircraft scales today. This particular aircraft is loaded with options. It came in at 255 pounds, without fuel tank. Because the limit is 254 pounds (actually, 253.99999 pounds) this would seem to be a failure. (I mistakenly first weighed it with the fuel tank and with fuel, and it was way over… ooops…. take out the fuel tank and reweigh…)

Our fuel tank weighs about 3 pounds dry, so today’s final weight was 258 pounds. Consequently, we were 4 pounds overweight relative to FAR 103. I’ll explain how we solved the problem in a few moments.

Here’s what’s on the airplane:

1) 4130 Steel airframe / elevator / rudder
2) Covering system with UV protectant
3) Bungee landing gear
4) Grove gear
5) Grove hydraulic brakes
6) Enlarged tail wheel
7) Rudder steering
8) 45HP engine, derated to accommodate part 103 cruise speed (with more work to be done)
9) 3 blade Powerfin prop
10) 5 gallon fuel tank
11) Electric Fuel gauge
12) Airspeed indicator
13) Altimeter
14) Tachometer / Hourmeter
15) EGT / CHT
16) Voltmeter
17) Turn & Bank
18) Instrument panel, made of wood
19) Transceiver and permanent antenna
20) Transponder and antenna
21) LIPO Battery System with current system
22) Engine Starter Relay (but no electric start with this current engine)
23) Voltage regulator for radio
24) Alternator (this airplane generates electricity to run avionics and charge the battery)
25) Gizmo Dock

I’m sure I’m forgetting something. It’s loaded with goodies. The panel would be comfortable and pleasing to any VFR pilot.

My goal was to have a FAR 103 airplane with high technology construction (Carbon Fiber), amazing power, full panel, etc. So now I’ve crammed all this stuff into the demonstrator, and I’m 4 pounds overweight.

Here’s the solution:

1) We quickly reconverted the gear from bungees to solid. This saves about 28 ounces. I then removed the turtledeck, as it is not necessary for flight. Another 22 ounces saved. Finally, I removed a chunk of aluminum which was simply not necessary. (We’d been using it as a base for fuel tank in the baggage compartment; no longer necessary.) It also weighed 22 ounces. Total savings: 72 ounces, exactly 4.5 pounds.

Final weight, as adjusted: 253.5 pounds. FAR 103 legal! Loaded with features, engine, and performance! It can be done. (If configured with a smaller engine, performance remains VERY SIMILAR and weight drops further — the 28HP engine weighs 18 pounds less!!)

I’ve heard reports of guys breaking their bungees and consequently hitting the props/destroying the engines. I’m OK without bungees for awhile. We’ll figure out something to add them back to the demonstrator sometime soon.

The demonstrator still has a little work to do in Wichita, but it will soon be ready to move to Oshkosh. For example, Friday morning, we’re doing an air to air photo shoot.

7 thoughts on “The weight of a Belite 254

  1. A wood prop would be lighter.Do you really need a voltmeter?Can the fuel level be checked visually and lose the gauge?I think you need to mentally separate "experimental" and "ultralight". For instance, ultralights don't need transponders!

  2. @Quenton: I like that he's keeping it in the same config. xpdr is a good thing to have. While not required, an ultralight has such a small radar return, and flying under Class B with other planes skimming under, it would be nice to have mode C or mode S.For less weight, as James said, drop 18lbs for the part 103 only engine.

  3. Hi,Everyone's mileage varies. The basic configuration for the kits won't have any of the voltmeters or transponders. We'll be taking a couple of airframes with really enormous tires. Folks wanting those wouldn't take the electric and all the panel stuff (at least not under part 103, because of weight).It's true that ultralights don't need transponders! But it was fun to do, anyway. I checked out its operation with Wichita approach control today, it worked fine.James

  4. We'll have 4 birds at Oshkosh. 1 is our flying demonstrator, which is loaded with stuff. The other 3 have various configurations.One other thought, we are definitely trying to market this airframe as an ultralight FAR 103, and also as a very fun little experimental plane, for those so inclined. You pick the rules you want to fly under, you pays your money, you makes your choices! 🙂 James

  5. Epoch electronic Aircraft weighing kit is designed primarily to cater the accurate weighing needs of aircraft and aerospace vehicles, but can be used for other precision weighing application as well as for the calibration of force generating machines. Aircraft weighing

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