Cookies used in this website are gluten free, wheat free and dairy free. By using this website you agree to our use of cookies. More Info
Guest
Login Below
Join Us On Social Media!
   
Get The Model Boats App!
Apple App Store
Android app on Google Play


Help Support This Website
£
or enter custom amount

(Non Contributor)

Help support this free
website and donate.



£285 a year is needed to keep the website and apps online. Please consider donating £5 or more to help towards these fees.
All donations are securely managed through PayPal. Amounts donated are not published online.

Many thanks for your kind support.

Model Boats Website Team


Donation History
February 2018: 5 people
January 2018: 25 people
December 2017: 7 people
November 2017: 13 people
October 2017: 9 people
September 2017: 15 people
August 2017: 10 people
July 2017: 16 people


Unique Visitors This Month

Website Members

Terms and Conditions
Privacy Policy
Advertising
Contact


Model Boats Website
Active Users (21)
Login or Register
To Remove This Ad

Login or Register
To Remove This Ad
>> Home > Forum > Building Related > Airboat - one rudder?
Airboat - one rudder?
(215 views)
Author Message
cormorant
(Fleet Admiral!)





Forum Posts: 177
17th Jan 2018 17:53  
>> Permalink
mdlbt.com/37496

I am currently building a skimmer (Dave M will be very familiar with the type).
I propose to mount the motor as a pusher on the single pylon.
To minimise clutter I was thinking of a single rudder, mounted centrally behind the motor.
Most skimmers/airboats I have seen have two rudders, but do I really need two?
Any thoughts?
Thank you
Steve


Attached Files - Click To View Large

Dave M
(Fleet Admiral!)





Forum Posts: 1527
17th Jan 2018 18:15  
>> Permalink
mdlbt.com/37497

Hi Steve
The two models of your skimmer we have in our club both have two rudders.
Others have built from scratch but all have moved to two rudders as this gives the best control.
Our lake is large and perhaps on a smaller lake one rudder may be OK.


Live long and prosper

Dave
octman
(Captain)





Forum Posts: 106
17th Jan 2018 19:01  
>> Permalink
mdlbt.com/37501

I would have thought that, every thing else being the same, 2 rudders will probably, maybe, give twice the turning effort, possibly. Does the position of the rudder(s) in relation to the thrust of the prop affect the effectiveness of the rudder though? A single rudder immediately behind the centre line of the prop will have the max air flow at the top and bottom of the rudder blade, so presumably behaves differently to twin rudders on either side of the centre line where the max thrust would be in the central part of the blade. (I think!)
The other option is of course suck it and see, and change it if needed.

Hard to believe I know, but I am not an aerodynamicist!

Chris

RNinMunich
(Fleet Admiral!)





Forum Posts: 1304
17th Jan 2018 23:32  
>> Permalink
mdlbt.com/37509

From what I have seen of Airboats (including several in Florida many moons ago 🤔) two rudders are predominant.
Offset Twin rudders seem to be smaller, not so long front to back and single rudders huge and seem to have been used only on very early versions of airboats.
Must be a reason why they evolved to slimmer twin rudders. My guess is better response with less braking effect and consequent loss of speed in turns and / or less effect from cross-winds.
Whatever, have fun with it, but watch out for the alligators 😲😉
Cheers Doug 😎
PS can highly recommend a visit to an alligator farm 😲😲


Attached Files - Click To View Large


Young at heart - slightly older in other places 😉 cheers Doug
cormorant
(Fleet Admiral!)





Forum Posts: 177
18th Jan 2018 00:28  
>> Permalink
mdlbt.com/37516

Two rudders it is then!
Thanks for your thoughts chaps.

RNinMunich
(Fleet Admiral!)





Forum Posts: 1304
18th Jan 2018 00:40  
>> Permalink
mdlbt.com/37518

Don't mention it Old chap! 😉😉
Happy Skimming 😁


Young at heart - slightly older in other places 😉 cheers Doug
blickwer
(Apprentice)





Forum Posts: 1
18th Jan 2018 03:00  
>> Permalink
mdlbt.com/37522

My airboat has only one rudder and it handles well. If it had two rudders, I think it would be capable of makng sharp enough turns to tip over.

octman
(Captain)





Forum Posts: 106
18th Jan 2018 06:32  
>> Permalink
mdlbt.com/37531

I visited a crocodile farm in N Queensland once. No airboats though.


Attached Files - Click To View Large

cormorant
(Fleet Admiral!)





Forum Posts: 177
18th Jan 2018 14:35  
>> Permalink
mdlbt.com/37560

Hi Blickwer.
What are the dimensions of your boat and rudder? Pictures would be helpful also.

Thank you.

Steve

Falmouth1729
(Sub-Lieutenant)





Forum Posts: 8
18th Jan 2018 20:20  
>> Permalink
mdlbt.com/37570

Mine has one.


Attached Files - Click To View Large