RC Scale Boating Enjoy rc scale boating? Talk about it here.

Need help with COG Crandall flyer 15

Reply

Old 09-22-2018, 09:32 AM
  #1  
Grizzle1
Thread Starter
 
Join Date: Aug 2009
Location: San Diego, CA
Posts: 28
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Need help with COG Crandall flyer 15



strut angle and prop distance from rear


overall setup


big prop turns it into a submarine, smaller black prop porpoises like crazy


balances about here


engine placement
Hi all! I am just finishing up a Crandall flyer 15 build and I am having a problem with porpoising at low to medium speed with a 50mm 2 blade.. (5-15 mph) I cant go any faster either as it starts actually coming out of the water. Totally out of control. Right now it balances at almost exactly 50% of total length. 21" at 42" long. If I use a larger 70mm 3 blade prop it will plow the bow underwater. Here are some pics of the set-up I have. I have a few different scale props hopefully coming today to see if that will make any difference. Any suggestions? Oh, the motor is an HP 1.2 gold cup inline twin turned marine. Thanks in advance!
Grizzle1 is offline  
Reply With Quote

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


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service