"blag-it" Forum

Hobbies and pastimes => Radio control projects discussion => Topic started by: a.flynn on 14 October, 2019, 04:34:40 AM

Title: New EDF powered fast-electric boat project
Post by: a.flynn on 14 October, 2019, 04:34:40 AM
Hi to all on the forum.  For what it's worth I've just started a new fast-electric boat project that will be powered by an electric ducted fan, or EDF.  So far I've just ordered the hull which is 3 foot long and have done a rough plan.  See images below.  Anyway, any ideas, pointers appreciated!  Thanks.
Title: Re: New EDF powered fast-electric boat project
Post by: McGaskil on 14 October, 2019, 04:49:22 AM
Nice idea, :) but why an EDF over a regular prop, and what sort of performance are you aiming at.  Also any stats like length of hull, etc?
Title: Re: New EDF powered fast-electric boat project
Post by: blag-it Admin on 14 October, 2019, 05:13:50 AM
I'm no expert on fe-boats although I did build an rc electric boat a looong time ago which was a sort of tug boat...  Going by the first image it looks about 30-odd inches long?  I would suggest as powerful an EDF as possible (budget allowing...) for a hull that sort of size, which atm doesn't include the deck or anything else, to get reasonable performance, so for an fe-boat 45+mph minimum.
Title: Re: New EDF powered fast-electric boat project
Post by: cybernut on 14 October, 2019, 07:30:17 AM
Nice grooves on a nicely pointed hull there. :)  So happens I've built two fast-electrics so hope some of this helps.  Going by your mock-up diagram it looks like you're going for a flat deck which is a good idea as this will afford some down-force on either side of the canopy and so keep the bow down and reduce bobbing.  However you would need to set the edf slightly further back to prevent pushing the bow down tooo much. :o  For a boat that size you'll need at least a 9cm fan with brushless outrunner that has high rpm and min of 12 LiPol cells; ideally 12cm fan with 18 cells.  For the deck use either fibreglass which I think the hull is, or gel coated styrofoam.
Title: Re: New EDF powered fast-electric boat project
Post by: a.flynn on 15 October, 2019, 03:24:59 AM
Nice idea, :) but why an EDF over a regular prop, and what sort of performance are you aiming at.  Also any stats like length of hull, etc?
An EDF should produce less water spray, also my work conditions aren't ideal atm, and so installing an EDF would make my job slightly easier over a conventional prop set-up.  The hull is 3-foot long, so 36" and I'm looking at hopefully 45-50mph realistically for a first attempt.
Title: Re: New EDF powered fast-electric boat project
Post by: a.flynn on 15 October, 2019, 03:30:26 AM
I'm no expert on fe-boats although I did build an rc electric boat a looong time ago which was a sort of tug boat...  Going by the first image it looks about 30-odd inches long?  I would suggest as powerful an EDF as possible (budget allowing...) for a hull that sort of size, which atm doesn't include the deck or anything else, to get reasonable performance, so for an fe-boat 45+mph minimum.
Thank you. :) Length is 36" and I agree that as powerful an EDF as possible is a main consideration as the weight of the boat will o.c increase somewhat once the deck, hardware and canopy is added.  If I can get 45+mph I'll be happy :)
Title: Re: New EDF powered fast-electric boat project
Post by: a.flynn on 15 October, 2019, 03:37:43 AM
Nice grooves on a nicely pointed hull there. :)  So happens I've built two fast-electrics so hope some of this helps.  Going by your mock-up diagram it looks like you're going for a flat deck which is a good idea as this will afford some down-force on either side of the canopy and so keep the bow down and reduce bobbing.  However you would need to set the edf slightly further back to prevent pushing the bow down tooo much. :o  For a boat that size you'll need at least a 9cm fan with brushless outrunner that has high rpm and min of 12 LiPol cells; ideally 12cm fan with 18 cells.  For the deck use either fibreglass which I think the hull is, or gel coated styrofoam.
Great to know someone on here has built two FE boats! 8) Yes, I'm going for a flat deck more or less for those reasons although I also intend to use trim tabs to further reduce porpoising.  Thanks for the fan and battery spec tips :)
Title: Re: New EDF powered fast-electric boat project
Post by: blag-it Admin on 23 October, 2019, 05:18:01 AM
Good to hear you're sticking with it and hope the build goes well for you, how about some pics?

Admin
Title: Re: New EDF powered fast-electric boat project
Post by: McGaskil on 23 October, 2019, 05:43:12 AM
Yea!  Would like to see some pics of the construction so far!
Title: Re: New EDF powered fast-electric boat project
Post by: a.flynn on 24 October, 2019, 03:26:59 AM
I've not started building it yet, still some other parts to arrive, etc, but did take a few pics of the hull.  Unfortunately I can't find the cable to transfer the pics from the camera to the laptop LOL. ::)  Instead, here's a pic of the battery pack that was in the email confirmation.

It has 8 LiPol cells at 5000 Mah with a 29.6 v rating.
Title: Re: New EDF powered fast-electric boat project
Post by: cybernut on 26 October, 2019, 12:34:24 AM
I've not started building it yet, still some other parts to arrive, etc, but did take a few pics of the hull.  Unfortunately I can't find the cable to transfer the pics from the camera to the laptop LOL. ::)  Instead, here's a pic of the battery pack that was in the email confirmation.

It has 8 LiPol cells at 5000 Mah with a 29.6 v rating.
Smartphone?  Why not use that?
Title: Re: New EDF powered fast-electric boat project
Post by: a.flynn on 27 October, 2019, 01:00:54 AM
I've not started building it yet, still some other parts to arrive, etc, but did take a few pics of the hull.  Unfortunately I can't find the cable to transfer the pics from the camera to the laptop LOL. ::)  Instead, here's a pic of the battery pack that was in the email confirmation.

It has 8 LiPol cells at 5000 Mah with a 29.6 v rating.
Smartphone?  Why not use that?
Believe it or not I don't have a smartphone atm.  Still can't find the camera cable. :(
Title: Re: New EDF powered fast-electric boat project
Post by: blag-it Admin on 28 October, 2019, 04:26:56 PM
I've not started building it yet, still some other parts to arrive, etc, but did take a few pics of the hull.  Unfortunately I can't find the cable to transfer the pics from the camera to the laptop LOL. ::)  Instead, here's a pic of the battery pack that was in the email confirmation.

It has 8 LiPol cells at 5000 Mah with a 29.6 v rating.
Smartphone?  Why not use that?
Believe it or not I don't have a smartphone atm.  Still can't find the camera cable. :(
Maybe it's worth getting a replacement USB cable which don't cost that much...  Hope the build's still going ok though.
Title: Re: New EDF powered fast-electric boat project
Post by: a.flynn on 31 October, 2019, 03:47:50 AM
I've not started building it yet, still some other parts to arrive, etc, but did take a few pics of the hull.  Unfortunately I can't find the cable to transfer the pics from the camera to the laptop LOL. ::)  Instead, here's a pic of the battery pack that was in the email confirmation.

It has 8 LiPol cells at 5000 Mah with a 29.6 v rating.
Smartphone?  Why not use that?
Believe it or not I don't have a smartphone atm.  Still can't find the camera cable. :(
Maybe it's worth getting a replacement USB cable which don't cost that much...  Hope the build's still going ok though.
Thought of that o.c except it's not that easy.  It came with a proprietary USB cable with an odd type of connector at one end, can't find a replacement anywhere - even mfrs don't do it any more as camera is discontinued years ago. :P   

As said earlier, still not started the actual build yet as some parts still to arrive or get...
Title: Re: New EDF powered fast-electric boat project
Post by: blag-it Admin on 31 October, 2019, 06:07:17 PM
I see the problems, hope you find that cable.  I realise that prob doesn't help much... :-\


Admin
Title: Re: New EDF powered fast-electric boat project
Post by: blag-it Admin on 31 October, 2019, 07:19:16 PM
To all concerned with this thread.  I moved this topic to here ('Radio control projects discussion' under the new board 'Hobbies and pastimes') from 'Off-topic discussion' under 'Blag-it lounge' as it was more suited.


Admin
Title: Re: New EDF powered fast-electric boat project
Post by: MsLeon on 31 October, 2019, 11:23:01 PM
Great idea for a new board category.  Gratz! :)
Title: Re: New EDF powered fast-electric boat project
Post by: ATH019 on 20 November, 2019, 06:14:24 AM
I've not started building it yet, still some other parts to arrive, etc, but did take a few pics of the hull.  Unfortunately I can't find the cable to transfer the pics from the camera to the laptop LOL. ::)  Instead, here's a pic of the battery pack that was in the email confirmation.

It has 8 LiPol cells at 5000 Mah with a 29.6 v rating.
Smartphone?  Why not use that?
Believe it or not I don't have a smartphone atm.  Still can't find the camera cable. :(
Maybe it's worth getting a replacement USB cable which don't cost that much...  Hope the build's still going ok though.
Thought of that o.c except it's not that easy.  It came with a proprietary USB cable with an odd type of connector at one end, can't find a replacement anywhere - even mfrs don't do it any more as camera is discontinued years ago. :P 

As said earlier, still not started the actual build yet as some parts still to arrive or get...
Hmm, I see the problems.  An obvious solution I see is to get another basic point-and-shoot digital camera but one that takes a standard USB cable, or a mid-spec smartphone with camera and just take some more pics of the build.  Either can be had now for well under £100/$130 in high-street electronics and mobile phone shops. :D


Global Moderator
Title: Re: New EDF powered fast-electric boat project
Post by: a.flynn on 21 November, 2019, 11:38:39 AM
Nice grooves on a nicely pointed hull there. :)  So happens I've built two fast-electrics so hope some of this helps.  Going by your mock-up diagram it looks like you're going for a flat deck which is a good idea as this will afford some down-force on either side of the canopy and so keep the bow down and reduce bobbing.  However you would need to set the edf slightly further back to prevent pushing the bow down tooo much. :o  For a boat that size you'll need at least a 9cm fan with brushless outrunner that has high rpm and min of 12 LiPol cells; ideally 12cm fan with 18 cells.  For the deck use either fibreglass which I think the hull is, or gel coated styrofoam.
Found out from a few retailers, etc, that I should go for a brushless inrunner, not outrunner (sorry for contradict but that's what I've been told...) and that 8 lipo cells should be enough to begin with.
Title: Re: New EDF powered fast-electric boat project
Post by: a.flynn on 21 November, 2019, 11:41:38 AM
I've not started building it yet, still some other parts to arrive, etc, but did take a few pics of the hull.  Unfortunately I can't find the cable to transfer the pics from the camera to the laptop LOL. ::)  Instead, here's a pic of the battery pack that was in the email confirmation.

It has 8 LiPol cells at 5000 Mah with a 29.6 v rating.
Smartphone?  Why not use that?
Believe it or not I don't have a smartphone atm.  Still can't find the camera cable. :(
Maybe it's worth getting a replacement USB cable which don't cost that much...  Hope the build's still going ok though.
Thought of that o.c except it's not that easy.  It came with a proprietary USB cable with an odd type of connector at one end, can't find a replacement anywhere - even mfrs don't do it any more as camera is discontinued years ago. :P 

As said earlier, still not started the actual build yet as some parts still to arrive or get...
Hmm, I see the problems.  An obvious solution I see is to get another basic point-and-shoot digital camera but one that takes a standard USB cable, or a mid-spec smartphone with camera and just take some more pics of the build.  Either can be had now for well under £100/$130 in high-street electronics and mobile phone shops. :D


Global Moderator
Thanks, and I agree I'll prob have to get another cheapo camera.
Title: Re: New EDF powered fast-electric boat project
Post by: McGaskil on 29 November, 2019, 12:39:41 PM
I've not started building it yet, still some other parts to arrive, etc, but did take a few pics of the hull.  Unfortunately I can't find the cable to transfer the pics from the camera to the laptop LOL. ::)  Instead, here's a pic of the battery pack that was in the email confirmation.

It has 8 LiPol cells at 5000 Mah with a 29.6 v rating.
Smartphone?  Why not use that?
Believe it or not I don't have a smartphone atm.  Still can't find the camera cable. :(
Maybe it's worth getting a replacement USB cable which don't cost that much...  Hope the build's still going ok though.
Thought of that o.c except it's not that easy.  It came with a proprietary USB cable with an odd type of connector at one end, can't find a replacement anywhere - even mfrs don't do it any more as camera is discontinued years ago. :P 

As said earlier, still not started the actual build yet as some parts still to arrive or get...
Hmm, I see the problems.  An obvious solution I see is to get another basic point-and-shoot digital camera but one that takes a standard USB cable, or a mid-spec smartphone with camera and just take some more pics of the build.  Either can be had now for well under £100/$130 in high-street electronics and mobile phone shops. :D


Global Moderator
Thanks, and I agree I'll prob have to get another cheapo camera.
Great!  Maybe then we'll see some actual build pics. :-X
Title: Re: New EDF powered fast-electric boat project
Post by: ATH019 on 30 November, 2019, 06:07:36 AM
I've not started building it yet, still some other parts to arrive, etc, but did take a few pics of the hull.  Unfortunately I can't find the cable to transfer the pics from the camera to the laptop LOL. ::)  Instead, here's a pic of the battery pack that was in the email confirmation.

It has 8 LiPol cells at 5000 Mah with a 29.6 v rating.
Smartphone?  Why not use that?
Believe it or not I don't have a smartphone atm.  Still can't find the camera cable. :(
Maybe it's worth getting a replacement USB cable which don't cost that much...  Hope the build's still going ok though.
Thought of that o.c except it's not that easy.  It came with a proprietary USB cable with an odd type of connector at one end, can't find a replacement anywhere - even mfrs don't do it any more as camera is discontinued years ago. :P 

As said earlier, still not started the actual build yet as some parts still to arrive or get...
Hmm, I see the problems.  An obvious solution I see is to get another basic point-and-shoot digital camera but one that takes a standard USB cable, or a mid-spec smartphone with camera and just take some more pics of the build.  Either can be had now for well under £100/$130 in high-street electronics and mobile phone shops. :D


Global Moderator
Thanks, and I agree I'll prob have to get another cheapo camera.
Great!  Maybe then we'll see some actual build pics. :-X
This seems a bit of a 'dig' to me. >:(  I'm sure this topic is genuine...


Global Moderator
Title: Re: New EDF powered fast-electric boat project
Post by: a.flynn on 19 December, 2019, 08:05:35 AM
OK I found the usb cable for my camera! ;D Here's a pic showing more views of the hull, plus the rudder and EDF unit that arrived recently.  Still not started the build yet though as I still need to get other bits like esc, servo and Rx.

Title: Re: New EDF powered fast-electric boat project
Post by: ATH019 on 19 December, 2019, 09:53:09 AM
Gratz!  Glad you found it!  Nice pic as well.


Global Moderator
Title: Re: New EDF powered fast-electric boat project
Post by: a.flynn on 21 December, 2019, 01:01:57 PM
Thanks, and will certainly keep everyone up-to-date with the build as it happens.
Title: Re: New EDF powered fast-electric boat project
Post by: blag-it Admin on 24 December, 2019, 05:54:36 AM
Looking forward to it!  Seems like an interesting project, and glad you found that cable!


Admin
Title: Re: New EDF powered fast-electric boat project
Post by: a.flynn on 28 January, 2020, 09:32:05 AM
Looking forward to it!  Seems like an interesting project, and glad you found that cable!


Admin
Thanks. :)  I've still to order the rudder servo and ESC, oh and the radio, then I'll start putting it all together.  If ppl think I'm dragging this out a bit because of no actual build pics yet; well someone once told me things are often more difficult than they say they are and will take longer than you might think... ::)
Title: Re: New EDF powered fast-electric boat project
Post by: McGaskil on 04 February, 2020, 11:08:32 AM
Looking forward to it!  Seems like an interesting project, and glad you found that cable!


Admin
Thanks. :)  .... If ppl think I'm dragging this out a bit because of no actual build pics yet; well someone once told me things are often more difficult than they say they are and will take longer than you might think... ::)
Certainly true of this thread ;)  Nah, glad you got the cable sorted. :P
Title: Re: New EDF powered fast-electric boat project
Post by: a.flynn on 16 May, 2020, 07:51:09 AM
Well thank you kindly for that. ;)