Model Boat Mayhem

Mess Deck: General Section => Full Scale Ships => Topic started by: Dueller on September 29, 2010, 12:27:05 am

Title: Variable Pitch Prop
Post by: Dueller on September 29, 2010, 12:27:05 am

This prop changes pitch with the speed of rotation and not mechanically so much simpler and even reverses. Any of you engineers fancy building one?

http://www.youtube.com/watch?v=xdxY5Q7wXek&NR=1

http://www.youtube.com/watch?v=t9wcgMVL4WA&feature=related

http://www.bruntons-propellers.com/Autoprop/Brochureandtestimonials/AutopropBrochure.pdf

Title: Re: Variable Pitch Prop
Post by: Martin (Admin) on September 29, 2010, 07:50:16 am

Great idea but it looks like a lot of moving parts that would require a lot of maintenance.

Title: Re: Variable Pitch Prop
Post by: Admhawk on September 29, 2010, 06:00:52 pm

Quote from: Martin - admin. on September 29, 2010, 07:50:16 am

Great idea but it looks like a lot of moving parts that would require a lot of maintenance.

Less moving parts than a normal variable pitch prop with it's internal gears and shafts.

Title: Re: Variable Pitch Prop
Post by: Jimmy James on October 08, 2010, 09:09:47 pm

Friend of mine fitted 2 auto props to his 38 foot work boat about 9 or 10 years ago. He reported he had less cavitation - gained nearly 2 knots of speed for the same throttle settings and had about 40% extra power astern and was burning approx 1 1/2 gallions less of fuel for an 8 Hr trip
 He reckoned maintenance was minimal about 10 min twice a year when he had the bottem power washed
Freebooter

Title: Re: Variable Pitch Prop
Post by: hazegry on December 31, 2010, 02:57:13 pm

harbor models has them they are about halfway down this page

http://www.harbormodels.com/site08/main_pages/propulsion.htm#shafts