HJZ Predator Challenge, NorCal, 11/15/09 - Page 2

jrerickson · Nov 04, 2009, 05:38 PM

I'm using a 350 mah NiMH 1/3 AA pack which weighs around 34 grams. I have a Futaba 617 2.4 ghz receiver. 2 Dymond 4.7's and two 6 gram servos. My boom length is 28" from end to end. The rudder is cut into the boom 1 5/8". AUW is around 9.6 oz, but this is prior to fixing the cg. I may try it at a slightly forward position then move it back. If you use the lighter batteries and no regulator (bad idea?) you will be closer.

John

Quote:

Originally Posted by mpodder

Hi John
I have a Low Wing D-tube on order and was wondering which servos you use and how long you made the boom. I know Bob used all 9 g servos and had to add tail weight. I'm planning on going back to D4.7s and RC Builders 19.5 g lipo, without a reg, to try and get ballance without tail weight and an 83mm CG. What do you think?
Maurice

G Norsworthy · Nov 04, 2009, 07:32 PM

I have a 2 cell Lipo and Berg 4ch with 4 D47 servos. I had a NiMH with Hitec Electron 6 before and had to put weight in the tail. The plane is MUCH better in the lighter configuration. The tail weight was bad for the launch, causing hooking to the left. I am now able to compete on an even footing with the famous low wing where before it was just a plane to fly at the park and knock around with.

mpodder · Nov 05, 2009, 12:18 AM

Why is no regulator a bad idea John? I did call Hitec and they said an Electon6 will handle 8.4v. D4.7 are rated at 9.6. I did put this set up in my Taboo Gt and it worked well though I only ran it for a few hrs of operation. I respect your advice and your experience so where am I missing it?

Maurice

ROOSWH · Nov 05, 2009, 09:45 AM

Sorry, I know this thread is about "HJZ Predator Challenge, NorCal, 11/15/09"
but feel I should comment on higher voltages for the servos. Using a higher voltage on the servos will make them move faster and have more power, but at a cost. They will draw more current, run hotter and have a shorter motor life. I can't say I have tested this , but it should be correct electrically speaking. Does this hurt us in DGL, I don't know and have no idea of the difference in motor life span. I'm pretty certain we don't need the extra speed, probably more power (torque ) would be good, and with the larger Lipo batteries, then the higher current draw would not matter. I just thought you guys should at least know the pros and cons. Probably non of what I have said will matter one bit

Running one Lipo on a 40" DLG with 4 D47s the servo current used dropped down to about half or less of the current used in my 60" DLGs with 4 D47s. I can't tell any difference in control response between the 40" and 60" gliders.

walt

Bob, it's ok with me if you want to, or have the moderator do it, to move all this stuff to my "minor questions thread" if it's messing up your thread here. I have no idea of how all that works.

jrerickson · Nov 05, 2009, 11:05 AM

Maurice,

I'm just speaking out of manufacturer recommendations. I'm sure the receiver and servos can handle 7.4 volts. I think the life is going to be shortened on the servos, but if it works for you, go for it. ASK, for example, sells a 7.4v 2 cell lipo pack but he also sells a regulator that drops the voltage down. I just think of it as "redlining" a small servo and I don't want to replace it if I can avoid it.

John

Quote:

Originally Posted by mpodder

Why is no regulator a bad idea John? I did call Hitec and they said an Electon6 will handle 8.4v. D4.7 are rated at 9.6. I did put this set up in my Taboo Gt and it worked well though I only ran it for a few hrs of operation. I respect your advice and your experience so where am I missing it?

Maurice

rcgeorge · Nov 05, 2009, 11:28 AM

Quote:

Originally Posted by mpodder

Why is no regulator a bad idea John? I did call Hitec and they said an Electon6 will handle 8.4v. D4.7 are rated at 9.6. I did put this set up in my Taboo Gt and it worked well though I only ran it for a few hrs of operation. I respect your advice and your experience so where am I missing it?

Maurice

That is no problem, my Blaster-2 for one year. It has D60's wing, D47 in fuse. With 2 cell lipo no reg. I still have this DLG and works just fine. I usually crash in midair or blow up on launch before bad servo.

Kai@UCSB · Nov 10, 2009, 01:11 AM

Woooo....

We have 22 ~ 26 pilots registered now !!

Bob M. 2.4, Predator
AJ M 2.4, Predator
Kai 2.4, Predator
Mitch 13, Predator
Marcin 2.4, Predator
Don C, Raven
Greg 35, 37, Predator
Dom 34, Predator
Yaniv, Predator
Stephan, 2.4 Own Zone
Ron L 34 or 45 or 46, Predator
Mike P 33 and 57, Mini FW
John F. 50 or 52, Raven
Tom K 22, Vandal
Mike B 2.4, Predator
Duncan 2.4, FW4
Craig
Bruce M., Predator
Bob B, Mimi
Jack, Predator
Charlie, Taboo
Rich B, Predator
VespaBob
Kevin Predator

rcgeorge · Nov 10, 2009, 07:55 AM

Man you should have lots of fun, Take it to them Kai.

Bob McGowan · Nov 10, 2009, 07:45 PM

We are up to 28 pilots on the list now. It looks like we may have around 18 contestants in Predator 2 class alone.

There is no doubt that CJ’s generosity with the Predator 2 raffle and booms is helping bring people out. Many of these people are from our Predator 2 group buy so again, credit to CJ for providing an economical model that can win contests. The Predator 2 coming on the market has provided a real surge in our Bay Area DLG activity. Thanks CJ!

I am so pleased with the projected turn out. Thanks for signing up everyone!! It really will be great to see everyone again and meet the couple new guys coming out.

With anything over about 20 people we will need to split into 3 flight groups. It looks like that is what we will do. This is a good thing because that means you can get in some breaks during the day to visit, rest, and look around rather than constantly being on the go with flying or timing duties. With 3 flight groups, we’ll fly four rounds rather than our typical five and we’ll still get off the field at about the same time as usual. I expect we’ll be packing up and leaving the field for Pizza Depot at around 1:30.

The tasks for the day will be:

- Round 1: Best 5 flights, 2 minute max.

- Round 2: 1, 2, 3, and 4 minute max flights, any order

- Round 3: Best 3 flights, 3 minute max

- Round 4: Best 4 flights, 2.5 minute max

All rounds will have a 10 minute working time window.
We will explain in more detail at the pilots meeting.

RubSon · Nov 11, 2009, 09:08 AM

Hi Bob.

Sure would have liked to be there

No doubt!

In Denmark we would like some feedback on the 4 X 2,5 min task.

So please... tell us how it went and how the contestants thougth about it.

I know i´m early, but better safe than sorry

Ruben

jrerickson · Nov 14, 2009, 08:56 PM

Quote:

Originally Posted by G Norsworthy

I have a 2 cell Lipo and Berg 4ch with 4 D47 servos. I had a NiMH with Hitec Electron 6 before and had to put weight in the tail. The plane is MUCH better in the lighter configuration. The tail weight was bad for the launch, causing hooking to the left. I am now able to compete on an even footing with the famous low wing where before it was just a plane to fly at the park and knock around with.

Greg,

Just got a 300 mah 2 cell Lipo pack that weighs 16 grams. I cut out nearly 18 grams of battery weight and I also got to get rid of the tail weight. The plane really floats now. I'm at 256 g AUW and I'm pretty sure I'm throwing around 165'. I'm going to put a RAM3 in tomorrow and get some charts.

Good luck all you Predator owners! Wish I could be there.

John

C. J. Hung · Nov 15, 2009, 10:12 PM

the score;

Kai@UCSB · Nov 15, 2009, 10:50 PM

Score

Kai@UCSB · Nov 15, 2009, 10:51 PM

Quote:

Originally Posted by C. J. Hung

the score;

Sorry that there is typo there...
The 1st pilot, Yaniv, actually flies his own Twister.

The condition is very less wind but very weak lift too.
More pictures and reports will come.

Bob M. got shut down at the first round...
Kai was keep making wrong decision that he could ever make...

...

-Kai

Kai@UCSB · Nov 15, 2009, 10:56 PM

YES, we have 29 pilots show up!!

Some pictures before the contest...

And here is some nice pictures by Mike B.

http://battlewing.net/photo_gallery/...enge/index.htm

Nov 05, 2009, 09:45 AM	#19
ROOSWH Walter Roos Join Date: Aug 2004 Location: Canton, Ga. Posts: 954	Quick Comment Sorry, I know this thread is about "HJZ Predator Challenge, NorCal, 11/15/09" but feel I should comment on higher voltages for the servos. Using a higher voltage on the servos will make them move faster and have more power, but at a cost. They will draw more current, run hotter and have a shorter motor life. I can't say I have tested this , but it should be correct electrically speaking. Does this hurt us in DGL, I don't know and have no idea of the difference in motor life span. I'm pretty certain we don't need the extra speed, probably more power (torque ) would be good, and with the larger Lipo batteries, then the higher current draw would not matter. I just thought you guys should at least know the pros and cons. Probably non of what I have said will matter one bit Running one Lipo on a 40" DLG with 4 D47s the servo current used dropped down to about half or less of the current used in my 60" DLGs with 4 D47s. I can't tell any difference in control response between the 40" and 60" gliders. walt Bob, it's ok with me if you want to, or have the moderator do it, to move all this stuff to my "minor questions thread" if it's messing up your thread here. I have no idea of how all that works. Last edited by ROOSWH; Nov 05, 2009 at 09:50 AM.

Nov 10, 2009, 07:45 PM	#24
Bob McGowan Registered User Join Date: Oct 2003 Location: Fremont, CA, USA Posts: 445	This is getting big! We are up to 28 pilots on the list now. It looks like we may have around 18 contestants in Predator 2 class alone. There is no doubt that CJ’s generosity with the Predator 2 raffle and booms is helping bring people out. Many of these people are from our Predator 2 group buy so again, credit to CJ for providing an economical model that can win contests. The Predator 2 coming on the market has provided a real surge in our Bay Area DLG activity. Thanks CJ! I am so pleased with the projected turn out. Thanks for signing up everyone!! It really will be great to see everyone again and meet the couple new guys coming out. With anything over about 20 people we will need to split into 3 flight groups. It looks like that is what we will do. This is a good thing because that means you can get in some breaks during the day to visit, rest, and look around rather than constantly being on the go with flying or timing duties. With 3 flight groups, we’ll fly four rounds rather than our typical five and we’ll still get off the field at about the same time as usual. I expect we’ll be packing up and leaving the field for Pizza Depot at around 1:30. The tasks for the day will be: - Round 1: Best 5 flights, 2 minute max. - Round 2: 1, 2, 3, and 4 minute max flights, any order - Round 3: Best 3 flights, 3 minute max - Round 4: Best 4 flights, 2.5 minute max All rounds will have a 10 minute working time window. We will explain in more detail at the pilots meeting. Attached Thumbnails Predator 2, standard high wing 11.2 KB · Views: 38 Predator 2, low wing 21.6 KB · Views: 43

Nov 15, 2009, 10:50 PM	#28
Kai@UCSB Registered User Join Date: Nov 2003 Location: San Jose, CA Posts: 1,356	Score Attached Thumbnails 52.5 KB · Views: 19 97.8 KB · Views: 24 88.8 KB · Views: 17 77.7 KB · Views: 15 85.4 KB · Views: 21

Nov 15, 2009, 10:56 PM	#30
Kai@UCSB Registered User Join Date: Nov 2003 Location: San Jose, CA Posts: 1,356	YES, we have 29 pilots show up!! Some pictures before the contest... And here is some nice pictures by Mike B. http://battlewing.net/photo_gallery/...enge/index.htm Attached Thumbnails 122.4 KB · Views: 27 137.9 KB · Views: 26 109.7 KB · Views: 30 138.9 KB · Views: 29 109.2 KB · Views: 31

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Nov 04, 2009, 07:32 PM	#17
G Norsworthy Registered User Join Date: Sep 2008 Posts: 178	I have a 2 cell Lipo and Berg 4ch with 4 D47 servos. I had a NiMH with Hitec Electron 6 before and had to put weight in the tail. The plane is MUCH better in the lighter configuration. The tail weight was bad for the launch, causing hooking to the left. I am now able to compete on an even footing with the famous low wing where before it was just a plane to fly at the park and knock around with.

Nov 05, 2009, 12:18 AM	#18
mpodder Maurice Join Date: Jul 2004 Location: Bakersfield, Cal. Posts: 201	Why is no regulator a bad idea John? I did call Hitec and they said an Electon6 will handle 8.4v. D4.7 are rated at 9.6. I did put this set up in my Taboo Gt and it worked well though I only ran it for a few hrs of operation. I respect your advice and your experience so where am I missing it? Maurice

Nov 10, 2009, 01:11 AM	#22
Kai@UCSB Registered User Join Date: Nov 2003 Location: San Jose, CA Posts: 1,356	Woooo.... We have 22 ~ 26 pilots registered now !! Bob M. 2.4, Predator AJ M 2.4, Predator Kai 2.4, Predator Mitch 13, Predator Marcin 2.4, Predator Don C, Raven Greg 35, 37, Predator Dom 34, Predator Yaniv, Predator Stephan, 2.4 Own Zone Ron L 34 or 45 or 46, Predator Mike P 33 and 57, Mini FW John F. 50 or 52, Raven Tom K 22, Vandal Mike B 2.4, Predator Duncan 2.4, FW4 Craig Bruce M., Predator Bob B, Mimi Jack, Predator Charlie, Taboo Rich B, Predator VespaBob Kevin Predator

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rcgeorge Here is the lift! Join Date: Sep 2005 Posts: 1,175	Man you should have lots of fun, Take it to them Kai.

Nov 11, 2009, 09:08 AM	#25
RubSon Registered User Join Date: Dec 2002 Location: Herning, Denmark Posts: 67	Hi Bob. Sure would have liked to be there No doubt! In Denmark we would like some feedback on the 4 X 2,5 min task. So please... tell us how it went and how the contestants thougth about it. I know i´m early, but better safe than sorry Ruben

Nov 15, 2009, 10:12 PM	#27
C. J. Hung Registered User Join Date: May 2005 Location: Kaohsiung city ,Taiwan,R.O.C Posts: 143	the score;