FDM 32 V-Hull Build - Need Build Advice

[Tamelesstgr]

Ran again this weekend with the X442 and after andjusting the trim tabs and turn fins the hull is running very well.

Max Amps = 99.19
Max Watts = 2,221
Max RPMS = 33,557 (Average loaded around 30,000)
Max MPH = 44.3 (up from 35mph)
Motor Max Temp = 101.3
ESC Max Temp = 91.3

NSR 32 Leopard 1450kv 6S X442 Prop 9-4-16 Gauges.JPG

[Tamelesstgr]

Finally a video:

https://www.youtube.com/watch?v=oISD8Ttm3P4

[Tamelesstgr]

Pushed the hull past 48mph yesterday, all though I haven't changed anything, just calm water and I ran accross the entire pond, perhaps it built up more speed. Then I discovered this hull doesn't turn left very sharply and ran up on the rocks a wee bit. Scuffed the bottom and pushed the rudder and turn fin back a little bit. No damage to the prop thankfully, just my pride.

NSR 32 Leopard 1450KV 6S X442 Prop 9-25-16 GPS Speed Chart.jpg

NSR 32 Leopard 1450KV 6S X442 Prop 9-25-16 Pack Volts Chart.jpg

NSR 32 Leopard 1450KV 6S X442 Prop 9-25-16 Temp Chart.jpg

NSR 32 Leopard 1450kv 6S X442 Prop 9-25-16 Gauges.JPG

[Tamelesstgr]

Ive been making some runs the past few weekends trying a few different size props. They are predicting 40's and flurries here for Chicago this weekend. I've had the most luck with the X442 prop I have, best MPH so far. I tried my X445 and the amp draw was lower than the X442 which I didn't expect at all, about 30% lower. I've got about 6 datalogged runs for each prop and the X445 is consistently lower despite more pitch. Then I tried my X642 this past weekend, and again the readings are lower than the X442.

X442 - Average over 6 runs
Amps = 102
Watts = 2,346
Top MPH = 48.6

X445 - Average over 6 runs
Amps = 77
Watts = 1,870
Top MPH = 45.3

X642 - One run
Amps = 65
Watts = 1,716
Top MPH = 40.4

I was really stumped by the X642, I wonder if it is too much pitch for a boat that is so heavy like mine running 6S2P? Loaded RPM's are all pretty consistent between all 3 props, about 29,000 - 30,000 rpms. Pond behind my house has been pretty calm the last few weeks

[Tamelesstgr]

https://www.youtube.com/watch?v=fDd0GsMepSA

Video from today, probably the last of the boating season for me.

[fweasel]

Video from today, probably the last of the boating season for me.

Oh c'mon. If I had that pond in my backyard, I'd be out there until it froze over, running back inside in between runs to thaw out my fingers.

[Beaux]

Man the boat really looked strong, nice job.

[Tamelesstgr]

With every new prop I have tried it has gone slower lol. X442 is the fastest thus far. Still have some 3-blades to try. The X445 is running second place, the X642 has not performed like I thought.

[lt130th]

Finally got this one in the water! Looks great!

[Tamelesstgr]

I'm going to start modifying the strut/rudder assembly to accept more than 43mm prop. This 4082 wants a bigger prop to push
Also need to cut a new flex I ordered from OSE, need more shaft length for the larger props.

20170409_101326.jpg

20170302_214534.jpg

[Tamelesstgr]

More room for bigger blades, I just picked up an M545, and M447
Should be good to crack 50+ on this pig of a hull

20170411_221309.jpg

[Tamelesstgr]

Got some video this Sunday, topped 50mph, gotta pull my datalogs yet.

https://www.youtube.com/watch?v=bfdW6UeoduI

[Tamelesstgr]

When I built this boat I didn't really have a good way of securing the hatch with anything other than hockey tape. I wanted some mechanical fastening to keep the hatch from separating if there was flip or high speed tumble. So I drilled and tapped some aluminum, it's held up for maybe a year, but the threads got stripped out. I searched for some Stainless M3 fastener that I could add to the bracket. On RcGroups I learned this is a rivet nut. I resized the holes in the brackets and epoxied these in last night. Hope to see how well they set today.

20170502_211143.jpg

20170502_211128.jpg

20170501_210836.jpg

20170501_205234.jpg

20170501_205130.jpg

[Tamelesstgr]

Pulled my datalogs as well from the day I ran 3 sessions. kind of neat to see the consistency between runs:

NSR 32 Leopard 1450kv 6S M545 Prop 4-23-17 Gauges S1.JPG NSR 32 Leopard 1450kv 6S M545 Prop 4-23-17 Gauges S2.JPG NSR 32 Leopard 1450kv 6S M545 Prop 4-23-17 Gauges S3.JPG

[Tamelesstgr]

Usually I graph each individual session, but I left all 3 in the chart, kind of cool to see them in succession. I'm a little suspect about the ESC graph, it looks like the third run the temps crept up a bit, but I do recall that run was maybe 30 minutes after the last run.

Graph 1 = RPM
Graph 2 = ESC Temp
Graph 3 = Amps
Graph 4 = Voltage Drop

NSR 32 Leopard 1450KV 6S M545 Prop 4-23-17 RPM Chart.jpg NSR 32 Leopard 1450KV 6SM545 Prop 4-23-17 ESC Temp Chart.jpg NSR 32 Leopard 1450KV 6S M545 Prop 4-23-17 Amps Chart.jpg NSR 32 Leopard 1450KV 6SM545 Prop 4-23-17 Pack Volts Chart.jpg