View Full Version : Looking for a thread

Sean Atterbury - n/a
10-Jan-09, 02:46 PM
Hi all, Sorry to read about Barry, Did'nt know him but from posts seemed to be a great guy.

I am looking for one of the posts about 503's and how to fix where the craft rev's fine in a streight line and on left turns, but on right turns it only gives me 5 000, this has been mentioned before I remember but can't seem to remember where.

Help is needed.

Thanks in advance

RHudson - n/a
11-Jan-09, 12:00 PM
You need to back a little pitch off the fan, as its stalling.

jon_curtis - n/a
11-Jan-09, 02:16 PM
indeed its probably fan stall, do you have an after muffler on your 503? as the extra lenght of zorst brings the torque band down a little, which can also help in conjunction with a little less pitch.

Sean Atterbury - n/a
12-Jan-09, 06:52 AM
You know, that may just do it, I have put in all 9 blades and that did make the revs fall to 6 300 at full chat. I will change the pitch and see if it helps, but Y does it only do it when turnning the one way and not both?

No after muffler maybe I should get one some time. http://hovercraft.org.uk/images/icons/smiley_icons/icon_confused.gif

jon_curtis - n/a
12-Jan-09, 08:07 PM
as the fan is spinning in only one direction http://hovercraft.org.uk/images/icons/smiley_icons/icon_razz.gif

air can enter the fan easier in one direction than the other, due to the shape of the blade and the direction of spin, therefore when loaded in the opposiste direction the fan has to do more work for the same flow, as its harder for the air to enter the fan, ergo more load on the fan, the engine is a 2 stroke, which has the torque in the high end and therefore it doesnt have the grunt to keep the rev's up and you get what your seeing!