RC Airboats Discuss R/C Airboats here!

bad porpoising please help..

Reply
Old 03-27-2008, 06:22 PM
  #1
nick34
Thread Starter
 
Join Date: Feb 2003
Location: jacksonville, FL
Posts: 0
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default bad porpoising please help..

hello again im back readjusted eng mount moved way back man what a diff. it even flies on my grass .. i still had the eng pointed up a few washers but it still hops in the front pretty good to the point where it almost flips but i noticed it does it more when i let of the throttle it will be running smooth then start porpoising a little then i let go of the throttle and it starts hoping really bad what else can i do????
nick34 is offline  
Reply With Quote
Old 03-28-2008, 12:15 AM
  #2
boatman1
 
boatman1's Avatar
 
Join Date: Aug 2004
Location: rockawaybeach, MO
Posts: 156
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: bad porpoising please help..

Sounds like you need a bit of weight add to the nose of it

a few oz. in right place may calm it down
if you need more than 6oz. to settle it down , you need to see about
changing the motor angle some more
Hope this helps
boatman1 is offline  
Reply With Quote
Old 03-28-2008, 06:13 AM
  #3
Selph-Inflicted
 
Selph-Inflicted's Avatar
 
Join Date: Mar 2004
Location: Okeechobee, FL
Posts: 1,366
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: bad porpoising please help..

Nick,

Sounds like you may have moved it too far back now. I personally don't like adding weight to the boats. I like to utilize the weight that I have on the boat to make corrections. I would say move the motor forward a little more.
Selph-Inflicted is offline  
Reply With Quote
Old 03-28-2008, 06:23 AM
  #4
asmithnc
 
asmithnc's Avatar
 
Join Date: Feb 2004
Location: Lexington, NC
Posts: 918
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: bad porpoising please help..

I had a big flat bottom with 1.00 and it did the samething. I then added 1 pound to the front and it had no change in the attitude.
Two ideas.... add a water rudder. The extra drag may lessen the hopping. Trim tab will force the front end down causing a better ride.
asmithnc is offline  
Reply With Quote
Reply


Thread Tools
Search this Thread
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -8. The time now is 10:43 AM.