Flight Trimming

User avatar
illusionist
Member
Member
Posts: 942
Joined: March 20th, 2010, 4:13 pm
Division: C
State: MI

Re: Flight Trimming

Post by illusionist » April 9th, 2011, 8:21 pm

Most of the time, it just takes a tiny drop of glue to balance out the rotors. Put it on the tips of the rotors (lever efficiency and all).
2012-2013 Building Event Captain
Rule 7d. "Event Supervisors are allowed to break any competitors' devices" -bearasauras

User avatar
kjhsscioly
Exalted Member
Exalted Member
Posts: 517
Joined: January 16th, 2009, 11:55 am
Division: Grad
State: IL
Location: Chicago

Re: Flight Trimming

Post by kjhsscioly » April 9th, 2011, 8:25 pm

The issue with that is that you can't predict how heavy the glue is going to be. I like to sand the corners of the heavy side, so I can control what I take off.

User avatar
mrsteven
Exalted Member
Exalted Member
Posts: 815
Joined: March 13th, 2011, 5:40 pm
Division: C
State: IL
Location: UIUC (Formerly BGHS)

Re: Flight Trimming

Post by mrsteven » April 9th, 2011, 8:33 pm

good idea! but if it only is off enough that a single drop of glue or a little sanding fixes it, then is it really worth fixing at all? what kind of difference does it make time wise?
2011 Helicopters State Runner-up
2012 Helicopters State Champion
2013 Robot Arm State Champion

User avatar
kjhsscioly
Exalted Member
Exalted Member
Posts: 517
Joined: January 16th, 2009, 11:55 am
Division: Grad
State: IL
Location: Chicago

Re: Flight Trimming

Post by kjhsscioly » April 9th, 2011, 8:35 pm

I don't know, but in my opinion, weather always amplifies imbalances, so in the event it is humid, or the room is breezy, I like to balance my stuff.

jander14indoor
Member
Member
Posts: 1581
Joined: April 30th, 2007, 7:54 am

Re: Flight Trimming

Post by jander14indoor » April 10th, 2011, 6:11 am

chia wrote:Hmmm...
2e. Rotor construction: Competitors must construct the rotors themselves. Commercially available rotors or propellers must not be used in whole or part. Rotor thrust bearings may be commercially available items.
I interpreted this as meaning any part of the Ikara prop -hanger included- is not allowed.
So using this
Image
and its corresponding hanger wouldn't be allowed. I know it says bearings can be commercially available, but that just means beads or teflon washers, right?
Again, not the place for clarifications, blah...
To be clear on my earlier post. The only thing illegal under this years rules is the plastic hub and spars to the left in that picture as they are part of the rotor. The bead, washer, wire, and round plastic dohicky (a complex technical term meaning something I don't know the name of!) to the right is part of the prop hanger and OK as others have mentioned.

Jeff Anderson
Livonia, MI

User avatar
mrsteven
Exalted Member
Exalted Member
Posts: 815
Joined: March 13th, 2011, 5:40 pm
Division: C
State: IL
Location: UIUC (Formerly BGHS)

Re: Flight Trimming

Post by mrsteven » April 10th, 2011, 9:28 am

Ya requiring us to make our own bearings from wood seems rather farfetched.
2011 Helicopters State Runner-up
2012 Helicopters State Champion
2013 Robot Arm State Champion

User avatar
kjhsscioly
Exalted Member
Exalted Member
Posts: 517
Joined: January 16th, 2009, 11:55 am
Division: Grad
State: IL
Location: Chicago

Re: Flight Trimming

Post by kjhsscioly » April 10th, 2011, 10:22 am

It doesn't say wood. You could theoretically make them from metal. But I think the purpose of the rule was mainly to prevent people from using commercially made stuff to get a perfect pitch matched on both sides.

User avatar
mrsteven
Exalted Member
Exalted Member
Posts: 815
Joined: March 13th, 2011, 5:40 pm
Division: C
State: IL
Location: UIUC (Formerly BGHS)

Re: Flight Trimming

Post by mrsteven » April 10th, 2011, 10:47 am

kjhsscioly wrote:It doesn't say wood. You could theoretically make them from metal. But I think the purpose of the rule was mainly to prevent people from using commercially made stuff to get a perfect pitch matched on both sides.
ya thats true. I know teams that have gotten essentially pre-made kits that are online that are specific to SO saying 'SO legal.' I really dont like teams that use those because it's not in the spirit of the competition if someones giving you a mostly built one that all you do is attach prebuilt rotors to prebuilt motor stick.
2011 Helicopters State Runner-up
2012 Helicopters State Champion
2013 Robot Arm State Champion

User avatar
chia
Member
Member
Posts: 558
Joined: January 13th, 2009, 5:09 pm
Division: Grad
State: IL
Location: Derse

Re: Flight Trimming

Post by chia » April 10th, 2011, 12:56 pm

Well, it's not quite that simple to build a kit - then it wouldn't actually be "SO legal". I know what you mean, though... I built my first helicopter from a kit, and I'm really glad I managed to learn from it to build my newest one.
(avatar is by xamag)
Favorite events: Anatomy, Microbe Mission, Ornithology, Circuit Lab, Helicopter
NCHS '13
==>

User avatar
illusionist
Member
Member
Posts: 942
Joined: March 20th, 2010, 4:13 pm
Division: C
State: MI

Re: Flight Trimming

Post by illusionist » April 10th, 2011, 1:35 pm

Not to sound arrogant, but I've never built one from a kit. But I bought a kit for Wright Stuff last year, which taught me a lot toward building indoor duration models. Kit's do help, however students should take the experience and build their own helicopters.
2012-2013 Building Event Captain
Rule 7d. "Event Supervisors are allowed to break any competitors' devices" -bearasauras

Locked

Return to “Helicopters C”

Who is online

Users browsing this forum: No registered users and 2 guests