24 floz of glow fuel weighs 20.5 oz, while 16 floz of gasoline weighs 12.3 oz. Each will give enough flight time for 12 minute flights plus sufficient safety margin on a 14-15 pound plane (about 4 minutes of shooting landing approaches).
You could even up the total powertrain mass by using a Moki 2.10 (weighs 4.5 oz more than the 1.80). If the engine is propped down to the mid 7's (in the fat part of the power band) with a 20x10 or 20x8 the fuel draw decreases quite a bit and the noise drops dramatically too. Most reports claim 2.2 oz/minute full throttle, but around 1.5 oz/min in the air.
I wish I had weighed my ZDZ40 , but it weighed (holding one in each hand) about the same with the muffler, ignition, battery, and switch, as my brother's DA50R with muffler and standoffs. Sorry I don't have the actual numbers.
So, similar power, similar weight, higher purchase price vs. higher fuel cost. After several hundred flights the DA would save you money. Pick the best for your situation!
Brett
p.s. I just realized you are talking about the Patrick Edge. That is a high-quality plane, and Dave makes some good recommendations on his website. He states the plane weighs 16 oz more with the ZDZ40 setup, although half of that disapears with the fuel weight differential. Whatever you do, keep it LIGHT and you will love it.
ORIGINAL: RCAddiction
The weight difference is closer than 11 oz difference, fueled and ready to fly:
The Moki has higher fuel consumption, approx 1.5-1.75 times more fuel oz/min than the DA50. Moki fuel, 0% nitro with 18% oil, weighs 15% more than gasoline mix per ounce, depending upon oil content. So, the Moki will need nearly twice the fuel weight on take-off for similar flight times. My guess is that the DA50 and Moki 1.8 will weigh within 6 ounces at take-off.
Choose your poison. They are both great engines!