Going to build a 7ft wingspan t-28 for flite fest...need some input

[Pigfarm1403]

So my favorite plane of all time is the t-28 and I will be make a giant version of one for flite fest ohio. I have the plans and I have no issues creating the frame but I need some help on what electronics I should get. I was thinking around a 300-500kv motor with a 6s battery and a prop somewhere around 15x9x3....just a guess.

I found this motor on hobbyking and I was planning on using it with a 6s or higher battery and a 16x10x3 propeller and like a 100amp esc.... https://hobbyking.com/en_us/kd-53-30-high-voltage-brushless-outrunner-190kv.html

This seems like a too good to be true motor. If thats the case I was also looking at this motor with a 70amp esc and a 6s battery with a 16x10x3 propeller..... https://www.motionrc.com/products/flightlinerc-5055-390kv-brushless-motor

If both of those are not great setups for a 7ft wingspan trojan I was looking at this motor with an 80amp esc and a 15x6x3 prop and a 6s battery..... https://hobbyking.com/en_us/propdrive-v2-5050-580kv-brushless-outrunner-motor.html

I think that the las setup I mention has the most potential but I would like to get a second opinion on it. Thanks!

 

[DamoRC]

Any idea's what your all up weight might be?

Not sure about the HK Keda motor unless you are committed to going to higher than 6S (at only 190KV you'll be at half the revs of the flightline motor for the same voltage). The Propdrive seems to be on backorder (per HK.com), so who know's when you would actually be able to get your hands on one. Thus by process of elimination get the Flightline? It should have no problems handling that prop.

But first, a weight estimate would be good.

DamoRC

 

[F106DeltaDart]

Sounds like an awesome project! The Flightline motor should do the trick nicely, and they have an excellent track record for quality.

 

[Pigfarm1403]

5000-6000grams is my estimate on weight. Whats the most accurate thrust calculator you guys have come across that would help also.

 

[F106DeltaDart]

I use ecalc as a baseline for figuring things out. It is the best out there for its price range, but motocalc is the most accurate overall.

I ran some numbers through ecalc using the FMS 5060 360kv (should be very close to the Flightline Motor) and here’s what I got. I would personally bump up to a 100A ESC for a bit more headroom, and they are pretty cheap from heads up RC.