Congrats!!!! that was nice to see you accomplished that flight.
Did you incorporate differential thrust into your system?
Like your inlet design. Could you explain what you did and some pics please?
I did set it up for DT but took the mixes out when I realized the thrust to weight ratio was very low. After a few failed attempts I added the cheater vents and the thrust went from 4.4lbs to 5lbs. So I thought I might need all the thrust available. My DT mixes would reduce the one motor in a turn so some thrust would be lost. The nacelle spikes will go back in if I can fly it successfully a few times.
The inlet design was based around the 70mm EDF's diameter, which dictated the scale, 1:17.47. The nacelles are rather rough. I did the inlet edges at the front from the rounded tops of cream cheese container edges but I may ask a flying club member with a 3D printer, to print me some nacelle inlets. To make the nacelles, I took Dollar Tree foam, removed the inner paper and got it rounded. Then I heated some wet 1/16th balsa soaked in ammonia water, and used Gorilla Glue to form it to the foam. I wrapped it around some bottles and rubber banded it overnight. The ducts are actually halves glued together. They are centered around, and hide a flat triangular plywood spar that extends along the leading edge, and then through the nacelles to support the outer wing tips. Actually the halves are not split equally. Based on the Dryden Research 3 View I worked from, the top is larger than the bottom half. Initially most of the fuselage and chines were covered in balsa, but I've since cut major sections out and put in Dollar Tree foam to reduce weight. The one attached picture shows the initial layout in plywood. I used too much. The fuselage was two 3 inch mailing cardboard tubes. They are heavy and I ended up cutting most of it off the top, reinforcing the foam removeable access sections with the rounded cardboard strips, and reattaching them with magnets. Almost the entire top of the fuselage can be removed for access to the ESCs, battery tray, blue box multiconnector and the Rx.
I also moved the 2 inner elevon servos (HiTec D-85MGs) forward 10 inches (23g each) to move some weight forward. If I were to rebuild, I would leave most of the balsa out and strengthen the foam with only WBPU and see how that goes. If it went well, then I'd cover it better with something like Polyspan or that laminating film at Alofthobbies 1.5mil thick.
New Stuff / Laminating Films (alofthobbies.com)
Twice I've aborted takeoffs due to low speed and found the plastic hub was melted around the axle on one wheel. Either wheel alignment problems or too much speed on the roll was the problem. I tried initially with dual 45mm tires on the mains, but one was always still in the airstream when retracted. So I've put one 2.5" tires on each main, duals on the nose LG, with a bushing in the hubs for the next attempt. I would like to try bearings in the hub but the ones I've tried were not good. I'm too cheap to buy good ones. The grass is the main problem with too much drag. Cooler denser air and dead grass will help the most when I try again - soon I hope.
Don