Propping a Hacker 20-20L at Altitude  
View related threads: (in this forum | in all forums)

Tower Hobbies
Enter up to 4 keywords or Tower stock numbers
Logged in as Guest



Users viewing this topic: none
  Printable Version
       

All Forums >> Electric Aircraft Universe >> 3D Electric Flying! >> Propping a Hacker 20-20L at Altitude
Page: [1]

Login
Message << Older Topic   Newer Topic >>
Propping a Hacker 20-20L at Altitude - 8/15/2006 7:41:56 AM   
zope_pope



Posts: 1042
Joined: 1/19/2003
From: Aurora, CO, USA
Status: offline 		Hi Guys,

I have an Airfoilz Edge 540 with a Hacker 20-20L, X20 ESC, TP 1320 11.1 Lipo. It comes in at about a pound and has pretty good vertical performance. I live in denver where the air is quite thin and was wondering if I would be better off propping the Plane with a smaller diameter prop for the RPM's or if I am good to go with my 10x4.7. I am just looking for that little bit more ya know? It always is no fun at my altitude trying to get similar performance to the lucky guys at sea level. :P Anyhow, if anyone has experience with this, your help would be greatly appreciated. Thanks!

Adam

_____________________________

If you choose not to make a decision, you have still made a decision.
       Post #: 1

RE: Propping a Hacker 20-20L at Altitude - 8/15/2006 4:45:05 PM   
mikeygp



Posts: 187
Joined: 10/27/2004
From: Greenville, TX, USA
Status: offline 		Try a 9X6 SF

_____________________________

Michael Yosten

(in reply to zope_pope)
       Post #: 2

RE: Propping a Hacker 20-20L at Altitude - 8/15/2006 6:07:52 PM   
jvigani


 

Posts: 48
Joined: 10/2/2003
From: Somerville, NJ, USA
Status: offline 		I would also try the 11x4.7 SF. I think that would perform close to the 10x4.7 at SL.

(in reply to mikeygp)
       Post #: 3

RE: Propping a Hacker 20-20L at Altitude - 8/16/2006 12:47:50 AM   
zope_pope



Posts: 1042
Joined: 1/19/2003
From: Aurora, CO, USA
Status: offline 		Cool. I'll try the suggestions. I didn't even think of going larger. The props turn easier up here and I didn't lose engine power due to altitude (unlike all of my glow planes). I'll try both, and report back on how they work. I am pretty happy with the 10x4.7 as I was able to practice torque rolls and pull out somewhat easily as needed. Extra power is always better though.

_____________________________

If you choose not to make a decision, you have still made a decision.

(in reply to jvigani)
       Post #: 4

RE: Propping a Hacker 20-20L at Altitude - 8/20/2006 2:36:31 AM   
WhtBronco



Posts: 2084
Joined: 10/3/2002
From: Winchester, VA, USA
Status: offline 		Another option, but more expensive, that I went with was to go from the 1320mah pack to a TP 3S 910mah pack. I cut an ounce off my plane, a Skeeter 30. At 14.25oz AUW it pulls out of a hover at truely ballistic speeds with a 20-20L and 10x4.7 APC SF. Course I am not at high altitude either IIRC 800' ASL, but if you drop 1oz performance will improve performance. I only 8 minute flights with this setup pulling 700mah from the pack, but that is nonstop 3D though.

The 910mah can handle the amp draw just fine as well. The motor, ESC and li-po are just barely warm after a flight and pulls a max of 19 amps which is within the discharge rating for the 910mah.

_____________________________

Chris
Wish I was flyin'!

(in reply to zope_pope)
       Post #: 5

RE: Propping a Hacker 20-20L at Altitude - 8/21/2006 12:02:59 AM   
zope_pope



Posts: 1042
Joined: 1/19/2003
From: Aurora, CO, USA
Status: offline 		Thanks for the suggestion. I am really new to all this electric stuff, however, I flew the 11x4.7sf prop for the first time today (it was sold out at all of my favorite stores) and wow, what a difference. It is truely ballistic and it was a really hot day today (air even less dense). I would highly recommend the 11x4.7sf for 3d pilots at altitude with this engine. It now hovers at below 1/2 throttle and rockets out with ease. I was considering dropping the battery size as well but I like my 13-15 minute flights plenty. Hope everyone had a good weekend flying.

_____________________________

If you choose not to make a decision, you have still made a decision.

(in reply to WhtBronco)
       Post #: 6

RE: Propping a Hacker 20-20L at Altitude - 11/27/2006 4:01:19 PM   
3W flyer


 

Posts: 57
Joined: 10/10/2006
From: longmont, CO, USA
Status: offline 		i use that motor and prop an my 21oz fliton mini edge 540 and it has planty of power. i live in boulder at 5500 feet.

_____________________________

walking, walking, walking, ooo look at that plane, flying, flying, flying.

(in reply to zope_pope)
       Post #: 7

RE: Propping a Hacker 20-20L at Altitude - 11/27/2006 5:21:31 PM   
gerrie


 

Posts: 43
Joined: 9/19/2003
From: SannieshofNorth WEST, SOUTH AFRICA
Status: offline 		Hi Everybody

Need some advice , I have a A 20-22L ,924 U/V ,1500mah EVO Li Po pack in a Look@Me (Seba Silvestri bi-plane foamy, 510 grams AUW) swinging ,
10 -4.7 SF, 35Amp GS speed control. The motor gets quite hot after flights. Also tied the 9-4.8 and 11-3.8 SF props -performance is good at 4500 feet above sea level.
HOW HOT IS SAFE FOR THE MOTOR? burns my finger tip on touching, dont want to hert the motor,cooling is okay -plenty.

Many THX
Gerrie

_____________________________

YS forever ! - fly fly fly ....

(in reply to 3W flyer)
       Post #: 8

RE: Propping a Hacker 20-20L at Altitude - 11/28/2006 11:35:17 PM   
lwatson



Posts: 742
Joined: 8/25/2003
From: Fort Collins, CO, USA
Status: offline 		That Hot of motor is probably going to be a problem, you are also not running in the best range for the most power. Try a little less pitch on the prop, or I have sometimes trimmed the tips off 1/4". Use the smallest prop you can that still gives you the performance you want.

If a motor gets too hot it will de-magnetize itself.

(in reply to gerrie)
       Post #: 9

Page:   [1]
All Forums >> Electric Aircraft Universe >> 3D Electric Flying! >> Propping a Hacker 20-20L at Altitude
Page: [1]





Jump to:


Google 



Search | Marketplace | Event Calendar | Local Clubs | Magazine | Product Ratings | New Products | Discussion Forums

Photo Gallery | Member Video Posts | RCU Video Gallery | Instructor Search | Field|Track|Marina Search

Advertisers | Hobby Vendor Resources | Rate Manufacturers | Sign In/Sign Up

SITE MAP!   : :   FORUM RULES

© 2001 - 2007 24-7 RC, LLC, all rights reserved.

Charities we support that also need your help
Yorkie Rescue | Humane Society | ASPCA | Crohn's-Colitis America

Kaango.com Classifieds

0.781RCU1