Hi Tezact,
Welcome to Hobbysquawk! I haven't had the pleasure to welcome you yet. :)
1) I don't see any need whatsoever for a thrust tube on the stock PRO setup. The aircraft's outlet diameter and taper was optimized to work in concert with the stock motor and fan, and the overall volume of the ducting. Choking down to a smaller thrust tube might buy you a couple mph, but only at the cost of amps since you'd be falling off the other end of the output curve. If you wanted to add a tube that kept the current diameter, but just "smoothed out" the air, I suppose that might help, but I seriously doubt if the gains you'll actually perceive in the air will be noticeable. You'll potentially encounter the challenge of getting an absolutely smooth transition between the EDF's trailing edge and the thrust tube material itself, and any disturbance would work against your efficiency gains.
2) I don't have the model in front of me so perhaps someone else can measure it to be sure, although I don't think an 80mm EDF can fit in there. Even if it could physically fit, I really don't think an 80mm EDF is necessary in this aircraft. You wouldn't have the ducting volume to properly feed it, anyway. The stock setup is fast and nimble with excellent thrust. Please consider enjoying the aircraft stock, as it was designed, before reevaluating if you really want to add more time and money into a possibly unrewarding modification. This advice, coming from the Designer ;)
Welcome to Hobbysquawk! I haven't had the pleasure to welcome you yet. :)
1) I don't see any need whatsoever for a thrust tube on the stock PRO setup. The aircraft's outlet diameter and taper was optimized to work in concert with the stock motor and fan, and the overall volume of the ducting. Choking down to a smaller thrust tube might buy you a couple mph, but only at the cost of amps since you'd be falling off the other end of the output curve. If you wanted to add a tube that kept the current diameter, but just "smoothed out" the air, I suppose that might help, but I seriously doubt if the gains you'll actually perceive in the air will be noticeable. You'll potentially encounter the challenge of getting an absolutely smooth transition between the EDF's trailing edge and the thrust tube material itself, and any disturbance would work against your efficiency gains.
2) I don't have the model in front of me so perhaps someone else can measure it to be sure, although I don't think an 80mm EDF can fit in there. Even if it could physically fit, I really don't think an 80mm EDF is necessary in this aircraft. You wouldn't have the ducting volume to properly feed it, anyway. The stock setup is fast and nimble with excellent thrust. Please consider enjoying the aircraft stock, as it was designed, before reevaluating if you really want to add more time and money into a possibly unrewarding modification. This advice, coming from the Designer ;)
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