50" Dragon Hobby Mono

[keithbradley]

Wow thats insane thinking of putting this setup in my Aquacraft Rio 51 what prop did you use to get the 57 mph Keith ? And do you think this setup would take a 65mm prop ?

Thanks

I'm not sure how the rio 51 hull rides, but with this hull it definitely liked the larger props. The largest I went was an x457 and that still seemed a bit small. If I had kept this boat I probably would have experimented with larger props. I think I would go down in voltage though (or better yet a lower kv motor). 8s with a x457 was a pretty hot setup. Trying to turn a big prop over 30,000RPM takes a lot of power, and pushing a big 51" hull through the water doesnt help.

If I were converting your rio I would buy the 730 kv Leopard or the Castle 2028. That would keep the current draw down and allow you a lot more freedom with your prop choice.

[Brushless01]

Thanks i looked at the 2028 but honestly 45-50mph is fast enough so how about the 1000kv or the 730kv ? Ideally i would like to stick with 8s lipo so i can use the same lipos in other boats and cars.

[keithbradley]

You could probably make either one of them work. The 730 kv would end up closer to a gasser setup, with a larger prop and lower RPM. The 1000kv would be close to 30,000 so you would realistically end up with something around the x457/x460 range.

[Punisher 67]

Very impressive run , For the money the 5692 is a hell of a deal

[Brushless01]

Thanks got I run the 730 kv on 8s using a 65mm to get speeds in the 50mph plus zone or not ?

[Make-a-Wake]

Thats a pretty low rpm range to try and hit 50+. You will need to swing a big prop, possibly in the x467 prather 255 range.

[keithbradley]

Thanks got I run the 730 kv on 8s using a 65mm to get speeds in the 50mph plus zone or not ?

Like I said you would be closer to a gasser's RPM range with the 730kv on 8s. To be completely honest, I have no experience with those type setups, but there are a few guys on the boards who run big gassers and could help with prop selection.

Understand that 50+mph with a 5692 on 8s is an ambitious goal for a boat that size. Im not positive but I think the rio is a bit longer than my boat (my hull only measured ~47") and I had mine trimmed out pretty well. Im not saying it's not possible, but it definitely isn't automatic.

[Brushless01]

ok thankyou might just go with a 2028

[WRXinMALVERN]

Hi Keith
A quick question or two can you remember what modification you did to the motor end of the flex shaft to get the motor to fit.
It looks like you cut the flex shaft shorter. Did you change the angle of the flex shaft to meet the motor.
You said you could not find a couplers so you would make your own and if so how did you do it

All help would be very appreciated

Thanks in advance Gareth redfern

[Drax21]

I have the 5692 coming for my DF40. Hopefully it goes something like this!
How long are your run time Keith?

[keithbradley]

I have the 5692 coming for my DF40. Hopefully it goes something like this!
How long are your run time Keith?

Run times were terrible in the big mono. 3-4minutes out of 4 4s 5000mah lipos. The DF40 is A LOT smaller hull though. You should get better runtime out of that one and it's relatively easy to get them in the 70s.

[Drax21]

Run times were terrible in the big mono. 3-4minutes out of 4 4s 5000mah lipos. The DF40 is A LOT smaller hull though. You should get better runtime out of that one and it's relatively easy to get them in the 70s.

5 mins would be nice since my journey to the lake takes me 25 mins

[Espresso]

This is an old thread but wow, that boat was fast for its size. It turned really well too. Looked like a mid 30" boat racing around the pond. Hard to believe it's pushing 50" going 50+mph.

Do you recall the weight with and without lipos? I have a Rio 51 that I'm planning to install the same motor/ESC combo in (Leopard 5692 1090KV). I'm planning to use 8S2P. The hull has a rear overhang and funky pointed fountain boat tip otherwise it's a 45-46" hull @ ~8.5lb with just hardware. Just waiting on some upgraded hardware items and finding the time to piece it together. Also need to figure out how to prop it to avoid having a meltdown.

[martno1fan]

50 mph in a 50" boat is not hard to achieve but in my opinion best bet is twins,for instance a friend over in Finland built one of my 58" Apache (Navaho version) hulls using twin t 600 880 kv motors on 6 s and he was getting 50-52 mph,hes since switched to two himodel outrunners 910 kv motors on 6s and speeds arround the same maybe a tad more,she runs awesome.
Whats more impressive is hes only using cheap hobbyking 200 amp esc,s so this build wasnt expensive and it runs flawlessly.

[Drax21]

50 mph in a 50" boat is not hard to achieve but in my opinion best bet is twins,for instance a friend over in Finland built one of my 58" Apache (Navaho version) hulls using twin t 600 880 kv motors on 6 s and he was getting 50-52 mph,hes since switched to two himodel outrunners 910 kv motors on 6s and speeds arround the same maybe a tad more,she runs awesome.
Whats more impressive is hes only using cheap hobbyking 200 amp esc,s so this build wasnt expensive and it runs flawlessly.

That is a sweet running boat! Cuts through the chop so easy