Eflite Ultimate flight problem

Eflite Ultimate flight problem
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Eflite Ultimate flight problem - 9/22/2004 1:14:41 AM

Posts: 361
Joined: 8/1/2003
From: Fort Mill, SC, USA
Status: offline

I had my first flights tonight and found that with the recommended CG, and with brush less motor lipos all the power goodies.. the plane wants to fly tail down, so when I make a turn with the ailerons it totally drops the tail down almost to a hover?????? I have the thrust line set up with the battery, rx and speed controller on the carbon fiber thrust line that holds the motor....any ideas..this is my first electric plane I have heard that if I have up thrust in the motor that would cause it, but the 3600 gear box the aluminum one fits perfectly on the stick ?????

< Message edited by Iceman30 -- 9/22/2004 1:15:26 AM >

RE: Eflite Ultimate flight problem - 9/22/2004 1:26:21 AM

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Joined: 7/27/2004
From: cambridge, MA, USA
Status: offline

The recomended setup in the manual is incorrect. There is an addendum to the manual on the horizon website which shows the corrected battery location.

(in reply to Iceman30)

RE: Eflite Ultimate flight problem - 9/22/2004 3:29:08 AM

Posts: 361
Joined: 8/1/2003
From: Fort Mill, SC, USA
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I can't find any thing different, can you explain more?? The instructions look just like mine... thanks though !!

(in reply to IHTFP_RC)

RE: Eflite Ultimate flight problem - 9/22/2004 5:11:57 AM

ual767

Posts: 779
Joined: 12/3/2002
From: Chantilly, VA, USA
Status: offline

There is a product bulletin on the Horizon website:

Ultimate CG Manual Correction
For best flight performance of the Ultimate, a high center of gravity is important. To achieve this, we recommend locating the battery on the cabane strut even with the front edge.

(in reply to Iceman30)

RE: Eflite Ultimate flight problem - 9/22/2004 5:29:43 AM

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Joined: 8/8/2004
From: Central Ohio, OH, USA
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These Ultimates tend to climb under power, whether upright or inverted.
Inverted if I add some power it will loop all by itself. Don't know if I have something wrong.

(in reply to ual767)

RE: Eflite Ultimate flight problem - 9/22/2004 6:02:44 AM

ual767

Posts: 779
Joined: 12/3/2002
From: Chantilly, VA, USA
Status: offline

My Ultimate is the same way. Inverted flight with any power above about 1/4 and it will outside loop on its own. Also, it has the worst knife edge coupling I have ever seen. As soon as you 1/4 roll to knife edge, it will do a tight knife edge circle on its own. I'm sure that if you played with the wing and stab incidences etc, you can make it better, but for a $50 foamie it's not worth the effort to cut it apart and make changes. But it's still a lot of fun - would I buy another one? No.

(in reply to Foamaholic)

RE: Eflite Ultimate flight problem - 9/22/2004 2:52:44 PM

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From: Central Ohio, OH, USA
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Right. Mine's the same way in knife edge.

(in reply to ual767)

RE: Eflite Ultimate flight problem - 9/22/2004 6:17:21 PM

ual767

Posts: 779
Joined: 12/3/2002
From: Chantilly, VA, USA
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Ok, I moved my battery (Kokam 3C 1500mah) to the top of the cabane up against the top wing as per the Horizon update, and the improvement is considerable. It will still climb slowly with full power inverted, but the knife edge pitch is almost gone. Much happier with the way it flies now! This change is a must-do.

(in reply to Foamaholic)

RE: Eflite Ultimate flight problem - 9/24/2004 8:30:37 PM

Posts: 123
Joined: 8/12/2004
From: Westport, MA, USA
Status: offline

Mine with the recommended CG flys perfect hands off at all power settings. And Knife edges are awsome. It does tend to roll alittle but not that bad. I think the CG is very important. I kept mine High and dead on the 3 3/4 mark.

_____________________________

Remember when Inverted Down is Up and Up is expensive!!!

(in reply to ual767)

RE: Eflite Ultimate flight problem - 9/25/2004 2:38:58 AM

Posts: 361
Joined: 8/1/2003
From: Fort Mill, SC, USA
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these things will take a beating though....was working or torque roll about 8 feet up got dumb thumbed and put it in, craced the fuse about 8 inches long ways down the fuse, and poped the middle of the top wing up of the cabine...little glue..flew it again in 15 mins and it hit HARD...but on the sticks all the time...these things no time to think..should help with my big scale plane...I hope..plus this darn thing is fun as heck..once you have all the parts the plane can be repaired or replaced for little of nothing !!

(in reply to Knighthawk2100)

RE: Eflite Ultimate flight problem - 9/29/2004 2:31:24 PM

M3

Posts: 184
Joined: 10/22/2002
From: Westerville, OH, USA
Status: offline

Here's mine:

Typhoon 6
Castle Creations 10 esc (I think that'e the name)
HS55s
Hitec Feather RX
All Shockflyer hardware (carbon linkages, etc)
3 cell 1200 mah lipos

Mods:

1. I added reinforcement "wings" to the front of the fuse for the motor mount and made my own motor plate
2. Used Shockflyer hardware from my two beat up Shockfliers (boy are they flimsy)
3. Mounted battery on bottom side of top wing about 1 1/2" inched in from leading edge (pictures were before I moved it)
4. Moved aileron servos out further on wing and cut holes to drop servos into wing (same for rudder and elevator)
5. Added two carbon rods to stiffen wings
6. Used fiberglass and epoxy to attach/strengthen landing gear instead of sewing

Flight:

Awesome. Far sturdier than my shockfliers, but heavier. The Typhoon six isn't enough power to pull hard out of a hover, but it does OK. I would go with the next size up. Great flight characteristics, doesn't climb much inverted at full throttle (probably because of the higher CG of battery mounted on top wing). Lands well with a little power. I like it so much I am going to sell my third NIB Shocky and buy another Ultimate.

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< Message edited by M3 -- 9/29/2004 2:37:53 PM >

(in reply to Iceman30)

RE: Eflite Ultimate flight problem - 10/6/2004 7:22:39 PM

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From: Winchester, VA, USA
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Recently I read in a amagazine article about another little EP bipe that the author had programmed a bit of flap into, like 2 degrees. He said this made the plane fly much better and then required just a bit of down elevator for inverted flight. I wonder if this would help with this little bipe. It might even help with the knife tucking.

Course on the other hand my DPM Ultimate 40 has upo elevator mixed in with the flaps to keep it level on approach. Well since I am building the Eflite Ulty now I guess I can find out, unless anyone has tried this alredy.

_____________________________

Chris
Wish I was flyin'!

(in reply to M3)

RE: Eflite Ultimate flight problem - 10/12/2004 3:47:47 PM

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Joined: 5/17/2004
From: brady, TX, USA
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Mine flys just fine with the c/g as shown,,Hmax 2014/D gearbox, TP 1350 2c,,moved the battery back further than the plans say but WOW it does get it on,,using my Eclipse 3 flight modes for all kind of stuff,,best damn plane i have flown if 40 years,,very tought plane,,did add carbon rods to the wings (top of cabane to lower wing) ,,i would highly recoment this plane to anyone,,selling all my fuel stuff to buy more Electric stuff,,,jimbo4261

(in reply to WhtBronco)

RE: Eflite Ultimate flight problem - 10/12/2004 4:00:06 PM

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Joined: 8/26/2003
From: Garden Grove, CA, USA
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I have one of these but prob. won't get to it for a few weeks. I learn from list. If the datum C/G needs to be raised [via battery on cabaine] why not put aille servo's in top wing and have link wire x-fer to bottom aille? --john

(in reply to jim haley)

RE: Eflite Ultimate flight problem - 10/12/2004 4:43:33 PM

Posts: 361
Joined: 8/1/2003
From: Fort Mill, SC, USA
Status: offline

I've been flying mine for weeks now. Have friend with two others, running the brushless setups. The battery location takes care of the problem with nose up flight. I have already broken off the carbon fiber tube that holds the motor block on, used 4-40 rod to put it back together, but it bends now if takes a hard hit. I am a 4 year pilot, so not a rookie flying, and fly an edge 540 27% when not flying this thing, but I fly this A LOT...this thing can take some abuse but the rod seems to take the brunt of it, this plane likes to tumble to nose, my friend cracked his couple of weeks ago. I have new one in box waiting on this one to be destroyed, i will reinforce the motor tube with a steel rod before mounting block next time..should not break at ALL like that..

anyone else had problem with CF tube?

(in reply to morpower)

RE: Eflite Ultimate flight problem - 10/12/2004 6:30:52 PM

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Joined: 6/26/2003
From: Champaign, IL, USA
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Guys, ther vertical CG on any airplane has an effect on pitch coupeling. However in larger airplanes, moving stuff inside like batteries etc has a minimal effect as its a small percentage of the weight of the model. However on foamies, the battery pack is a HUGE percentage of the overall weight of the airplane.
On the E-Flite Ultimate it is VERY important that the battery be mounter on the cabane at the leading edge. It will effect KE pitch coupeling VERY much. Its a must, and the effect on the flight performance of the Ultimate is like night and day.

(in reply to Iceman30)