78 inch silverhook setup advice

[cconeill]

Hi Guys I am going to run my 87 inch silverhook on two aquastar 730 kv motors with 2 etti 220 esc on 8s lipos to start. props will be two blade 60mm. do you see a problem with this?? goal is to run mid 40's. not looking to race. just a fun runner. will use this setup in a central rc 60 inch mti to. could use some advice. new to electrics. Thanks Craig

[fweasel]

Where in IL are you? I'd love to see that monster run someday.

[cconeill]

champaign. where are you. no one runs boats out here???

[fweasel]

Chicago. There are clubs that race NAMBA events in St. Anne and Mendota IL. I've never made the drive out there.

[Fluid]

Is this the motor?
https://hobbyking.com/en_us/turnigy-...ess-motor.html

That is a very big boat for 8S (is it 78" or 87"), not many folks have built one on a budget or for low speeds so you won't get much informed input, just a lot of opinions (mine included).

I don't think that 60mm props will be big enough with the limited power/rpm available, 65-70mm will more likely to work. Your rpm on the water will be around 18,000 which is about the same as a gas boat, so use gas boat props. A quality motor the size of the above Turnigy should be able to spin the larger props - but the Turnigys are not Neus or TPs and I don't know how well they will work. At least you have lots of room for batteries.

Good luck with the project!



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[cconeill]

Hi Fluid yes those are the motors. I bought them two yrs ago when I started this project. I do use TP motors in my boats now. I have them in my sv-43 knockoff and some in my MHz silverhook. both will fly. I used the sv-43 setup on my 45 inch xcat that weighed 18 pounds. got it upto 40. the bigger props will help. twin gas would give me 50-60. so hope to get the same from this setup. if not I will go with tp 56mm motors. is there a place to post plans on the forum?? I have xcat, twister cat, f1 and silverhook plans I am willing to share. just a thought. thank you for your input. with the bigger props will I have any heat issues on the esc?? 87 inches. my ww1 U-boat is 78??

[Fluid]

Your thread title says 78" but your first post says 87". Confusing...

I have no personal experience with the Ettis, and no experience with a boat that large, so I can't tell you what the amp draw will be. I would start with low pitch 65mms, but that is just a guess. I do know that my Scorpion 4035/850 on 8S pushed a 43" cat well with a 68 mm prop and pulled under 120 amps. But that is a lot different than a 87" boat with twins.

Great idea to share plans with the site members. You could post them in the build section for a start.

BTW I would love to see you Unterseeboot.


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[cconeill]

I was able to post the f1 plans. these rest are to big to upload files. pm me your email. I will send plans and photos of models and real U-boat. ub-88 and ucII minelayer.

[Nevs]

I have tested twin TFL SSS 5694/730 kv. with 58-14-3 props in a MHZ Loose canon dragboat. Peaks 120 A. RTR 10700 grams.

http://www.rcgalleri.dk/galleri/60598-baad_mhz_loose_cannon_dragboat

So I think your Jetis will do as long as you do not go higher then 8s.

[Nevs]

I have tested twin TFL SSS 5694/730 kv. with 58-14-3 props in a MHZ Loose canon dragboat. Peaks 120 A. RTR 10700 grams.

http://www.rcgalleri.dk/galleri/60598-baad_mhz_loose_cannon_dragboat

So I think your Jetis will do as long as you do not go higher then 8s.

[cconeill]

hi Nevs thanks. will work with this setup and see how well I can get it to work. not looking to race it. just look great running. my smaller hulls will scream. if it one wants plans pm me or ask around. I am sending them to guys on the forum. have a great thanks giving. Craig

[cconeill]

Hi G?uys here is the finial setup. this is a huge hull. so I will put the best that I have it it. x524 proteus motors, 300 amp esc, and 4s 30c. with 56-60mm props to try first time out. what do you think?? thanks Craig