Small 6"-8" speed boats - Page 6

boredom.is.me · Sep 21, 2009, 09:51 PM

http://www.offshoreelectrics.com/pro...prod=kyo-bmw02
Another link. They are out of stock but if you email them they will tell you when it should arrive.

Amp Abuser · Sep 22, 2009, 01:52 AM

Octura should start a new line of 2mm ID hubs with X series props.

hyper-dart · Sep 22, 2009, 05:43 AM

How have you al made the drive shafts for those small boats?
I have al the gear for it, but I can''t figure out how to make a driveshaft that will run smooth enough...

Jacar

boredom.is.me · Sep 22, 2009, 07:10 PM

Quote:

Originally Posted by hyper-dart

How have you al made the drive shafts for those small boats?
I have al the gear for it, but I can''t figure out how to make a driveshaft that will run smooth enough...

Jacar

Either direct drive with a pager. One that I haven't tried in the water yet is the prop shaft connected to the motor with heatshrink. I used a pico-z shaft and 7mm motor.

This air boat is slightly under 7.5" long and uses a thrust vectoring 8mm pager. I have a problem with it though. It won't turn at speed. Unfortunately hot glue doesn't stick to the book cover (five start) plastic and it keeps peeling, and I don't have sheet foam to make a new one. Pics don't want to upload so I'll try later.

Amp Abuser · Sep 22, 2009, 07:19 PM

I used piano wire (american gage) that was close enough to 2mm from the hobby store and ran it up directly into the brushless motor replacing the stock short shaft that was the motors axle.

hyper-dart · Sep 23, 2009, 05:56 AM

the problem is nog connecting the axle but getting the axle out of the boat, without the water getting in and not giving to much friction...

I have a 9gr outrunner and I will be getting a 240mah 2s lipo (450mah is to big I think...) so I will start with a 10" version.

bigger boats use a brass (or similiar metal) tube in which a teflon tube is inserted and the actual axle is threaded flex steel (something like that...) but I can't find a teflon tube small enough...

hope someone could shed some light on my problem (perhaps some foto's)

Jacar

boredom.is.me · Sep 23, 2009, 07:20 AM

Internet is finally moving again so here are pics.

customminatures · Sep 24, 2009, 11:20 PM

Quote:

Originally Posted by Amp Abuser

SAW trials for micro's start in July.

LOL Wow its been a while since I built those. This is cool. I will jump aboard on these!!

Matt

derk · Sep 25, 2009, 02:03 AM

building a stuffing tube isnt too difficult to do. i used an aluminum tube with brass inserts at either end, the aluminum tube is filled with marine grease to keep the water out. no pics but if i make another one, i will post it up for sure

*edit* does anyone have some setup geometry for a stable outrigger? links?

Yehya · Oct 13, 2009, 10:38 AM

So did we come up with a good combination of motor, prop, batteries, and speed controller for a small (8" or so) boat? either Hydro or Regular, surface riding or submerged?

boredom.is.me · Oct 13, 2009, 04:03 PM

For a flex I would use .5mm piano wire inside 1mm tube at each end. I'll emphasize on it when I get home.

Still havent done it, but don't see why it wouldnt work.

Amp Abuser · Oct 13, 2009, 09:16 PM

I have been working with the 10 gram motor here are some results. I am now getting lil over 20mph with 2S TP VS 25c 480mah.

boredom.is.me · Oct 14, 2009, 10:27 PM

Stupid me. The little Kyosho props actually have a 2mm I.D. and are 15mm in diameter.

HYDROJERRY · Oct 15, 2009, 10:02 AM

thats pritty incredable never seen a motor that small sweet. im trying to build a 24'' thats hard enough for me.

Amp Abuser · Nov 07, 2009, 06:47 PM

I managed to get a better pic of the lil 10g outrunner rigger in action

Sep 23, 2009, 07:20 AM	#82
boredom.is.me Being bored is a living! Join Date: Nov 2007 Posts: 555	Internet is finally moving again so here are pics. Attached Thumbnails 35.5 KB · Views: 59 75.4 KB · Views: 55

Oct 13, 2009, 04:03 PM	#86
boredom.is.me Being bored is a living! Join Date: Nov 2007 Posts: 555	For a flex I would use .5mm piano wire inside 1mm tube at each end. I'll emphasize on it when I get home. Still havent done it, but don't see why it wouldnt work. Attached Thumbnails grey-motor, black-motor shaft, dark yellow-tube with 2mm id, blue-tube with 2mm od 1mm id, red-.5mm (.020") piano wire, green-prop 4.1 KB · Views: 21 Last edited by boredom.is.me; Oct 13, 2009 at 08:25 PM.

Oct 13, 2009, 09:16 PM	#87
Amp Abuser Registered User Join Date: Dec 2007 Posts: 208	I have been working with the 10 gram motor here are some results. I am now getting lil over 20mph with 2S TP VS 25c 480mah. Attached Thumbnails 15turns of 28gage wire is what I rewound my 10g motor with. 57.7 KB · Views: 28 20 mm metal prop home made next to a stock X427 42.2 KB · Views: 33 This is a very small stator to rewind. 64.2 KB · Views: 31 1in pitch 1in dia dumas prop for just a buck. about 25mm prop. 14.3 KB · Views: 19 At speed tail up and getting a micro rooster tail with my 20mm metal prop. Its a clever design with alittle rake. like a 2020 prop. 2in pitch. 19.5 KB · Views: 40 The rigger runs about 5 mins on the small pack. Now I just take the rigger out with the 480mah pack and run two or three runs with it never changing out the battery. 46.7 KB · Views: 34

Nov 07, 2009, 06:47 PM	#90
Amp Abuser Registered User Join Date: Dec 2007 Posts: 208	I managed to get a better pic of the lil 10g outrunner rigger in action Attached Thumbnails 3.7oz Micro running on the prop on 2S 10g outrunner motor with a 20mm surface prop. 68.4 KB · Views: 37

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Need help with Kontronik Smile 30-6-12 speed control	Neil Morse	Electric Plane Talk	14	Jul 12, 2002 04:33 PM
1700 Sticks in stock 6, 8 and 10	sjslhill	Aircraft - Electric - Airplanes (FS/W)	0	Dec 18, 2001 01:54 PM
I Just Felt The Shock Wave (Unemployed for 6-8 weeks - at least)	Buzz_Man	Life, The Universe, and Politics	12	Sep 27, 2001 11:15 PM
converting 7.2v to 6.0v Speed 400 motor	jnyoun	Power Systems	5	Jun 30, 2001 06:41 PM
9 cells on 6 volt speed 400?	fourstarforty	Electric Plane Talk	5	May 15, 2001 01:35 AM

Sep 21, 2009, 09:51 PM	#76
boredom.is.me Being bored is a living! Join Date: Nov 2007 Posts: 555	http://www.offshoreelectrics.com/pro...prod=kyo-bmw02 Another link. They are out of stock but if you email them they will tell you when it should arrive.

Sep 22, 2009, 01:52 AM	#77
Amp Abuser Registered User Join Date: Dec 2007 Posts: 208	Octura should start a new line of 2mm ID hubs with X series props.

Sep 22, 2009, 05:43 AM	#78
hyper-dart Registered User Join Date: Oct 2007 Posts: 103	How have you al made the drive shafts for those small boats? I have al the gear for it, but I can''t figure out how to make a driveshaft that will run smooth enough... Jacar

Sep 22, 2009, 07:19 PM	#80
Amp Abuser Registered User Join Date: Dec 2007 Posts: 208	I used piano wire (american gage) that was close enough to 2mm from the hobby store and ran it up directly into the brushless motor replacing the stock short shaft that was the motors axle.

Sep 23, 2009, 05:56 AM	#81
hyper-dart Registered User Join Date: Oct 2007 Posts: 103	the problem is nog connecting the axle but getting the axle out of the boat, without the water getting in and not giving to much friction... I have a 9gr outrunner and I will be getting a 240mah 2s lipo (450mah is to big I think...) so I will start with a 10" version. bigger boats use a brass (or similiar metal) tube in which a teflon tube is inserted and the actual axle is threaded flex steel (something like that...) but I can't find a teflon tube small enough... hope someone could shed some light on my problem (perhaps some foto's) Jacar

Sep 25, 2009, 02:03 AM	#84
derk TheyreComingToTakeMeAway! Join Date: Dec 2003 Location: cda, Idaho Posts: 2,313	building a stuffing tube isnt too difficult to do. i used an aluminum tube with brass inserts at either end, the aluminum tube is filled with marine grease to keep the water out. no pics but if i make another one, i will post it up for sure edit does anyone have some setup geometry for a stable outrigger? links?

Oct 13, 2009, 10:38 AM	#85
Yehya Registered User Join Date: Apr 2008 Posts: 56	So did we come up with a good combination of motor, prop, batteries, and speed controller for a small (8" or so) boat? either Hydro or Regular, surface riding or submerged?

Oct 14, 2009, 10:27 PM	#88
boredom.is.me Being bored is a living! Join Date: Nov 2007 Posts: 555	Stupid me. The little Kyosho props actually have a 2mm I.D. and are 15mm in diameter.

Oct 15, 2009, 10:02 AM	#89
HYDROJERRY Its More Fun When Its Wet Join Date: Jun 2009 Location: north carolina Posts: 422	thats pritty incredable never seen a motor that small sweet. im trying to build a 24'' thats hard enough for me.