rrTV-PHOTO   New HD TV
HOME   rrTV-PHOTO   GALLERIES   MY GALLERY   HELP-FAQ
myHOME PM pmRR MEMBERS 348 ONLINE 20 EVENTS SEARCH REGISTER  START HERE
 
1 page570 viewsPOST REPLY
E-flite . Next D . Fast Lad Performance

.
.
e-Miniature Aircraft Furion - Razor - Ion-X > Chris: another quick question for you
 
 
Bonkers
Senior Heliman
Location: New York

Using a shorter tail boom, I'm assuming, reduces the torque applied by the tail rotor to counter the main rotor. In light of this, does this mean that using a shorter tail boom (i.e. 1.5" shorter) would require some trim adjustment of the tail rotor? If so, how much? My physics is a little rusty!
03-24-2005 Over year old.
 
 
MinAirChris
Heliman
Location: Sunny Florida

If I said something like 4.5%, would that mean anything? That is roughly the difference between a 33 inch boom and a 31.5 inch boom. Thrust from the tail rotor would remain the same. The torque is just force X moment so....

I would be very surprised if you made a trim change at all other than to recenter the linkages. I think the gyro would absorb the change.

Chris

Previously known as ChrisS
03-24-2005 Over year old.
 
 
Bonkers
Senior Heliman
Location: New York

I guess what I'm trying to ask is.....

As it stands now, the IonX appears to be set up so that it can yaw equally fast to the left and the right at maximum control throw in either direction. In order to accommodate a shorter tail boom, an adjustment would need to be made in the pitch of the tail rotor (carried out by adjusting the trim or by the gyro doing it). Presumably this adjustment would limit the amount of extra tail rotor pitch in one direction, and thus reduce the maximum yaw rate in one direction. Is this a correct statement in theory?
03-24-2005 Over year old.
 
 
MinAirChris
Heliman
Location: Sunny Florida

Mathematically, yes. The shorter boom will in effect reduce the available angular velocity in the yaw axis. However, in reality, there is so much there to start with, you couldn't possibly want or need as much as is available. I have seen XL's, old ones even, with the 31.5" booms that were set up for pirouette rates that were blinding. So fast I wondered why the battery didn't sling loose from the radio tray. Add to this the fact that the high head speed and consequently high tail speed give the Ion-X so much more tail than is usually available...I really can't imagine you would miss 1.5" off the end of the tail.

As for balancing of the yaw rates in either direction, this is just radio/linkage setup and I would think that even pulling one side back so that it matches the other, you would still have plenty. I could be wrong, there may be someone out there who likes a blury helicopter in full yaw...

All of my prototypes had 31.5" booms and they felt/flew fine. Many people flew them and I can't ever remember anyone telling me the tail felt underpowered or unbalanced FWIW....

Chris

Previously known as ChrisS
03-24-2005 Over year old.
 
 
Bonkers
Senior Heliman
Location: New York

It's worth a lot Chris. Thanks.

P.S. I hope you don't mind all the technical questions!
03-24-2005 Over year old.
 
 
Bonkers
Senior Heliman
Location: New York

Question about Ion parts.....

Chris,
Is there a part number for a 31.5" tail boom kit? MA has a 33" kit (i.e. that includes the boom, drive shaft, boom supports, etc.), but I didn't see one for a 31.5" kit.
Also, do you know if anyone makes bodies for the Ion? i.e. like an Airwolf body, for example?
03-25-2005 Over year old.
 
 
MinAirChris
Heliman
Location: Sunny Florida

I'm not sure what the 31.5" "kit" P/N would be, I'll check tomorrow. The Ion-X is a fairly short frame set, I plan on putting one into a fuselage myself later this summer. I am pretty sure it will fit into most if not all of our fuelages of at least 60 size. I'm sure the same is true for the Century fuse's as well. I helped a local guy here put one into a Bell 222 fuse a couple months ago. It was neat, one of the Century fuses, about 46 size, he used a 29 or 30" boom if I'm not mistaken. Ran it on 8S with a 24-4 and 600mm blades. Complete with re-tracts and really nice paint...it looks sharp.

Chris

Previously known as ChrisS
03-25-2005 Over year old.
 
 
1 page570 viewsPOST REPLY
Ace Hobby . Esprit Model . Thunder Power RC

.
.
e-Miniature Aircraft Furion - Razor - Ion-X > Chris: another quick question for you
 PRINT TOPIC Advertisers 

Subscribe to This Topic

Saturday, November 22 - 12:18 pm - Copyright © 2000 - 2008 runryder.com | email | link to rr | runryder needs cookie