DIY experts,I have a specific application. I need a high endurance disposable platform to make measurements in clouds and storms. Recovery is not important. The UAV would be equipped to transfer data to ground control station in near real time. Once data is obtained, recovery will be attempted. If recovery is not possible due to storm conditions, the UAV will be abondoned. Subsequent mission would be conducted with an identically equipped UAV.Important requirements:1. Cruise speed ~ minimum 50 knots2. Flight time (endurance) at cruise speed ~ 20 hours3. Payload (with full fuel onboard) ~ 3 kg4. Cost ~ less than $5,000 for airframeI know requirements are challenging but each will have to be specified for this project. Thank you all for your feedback!