HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Jan 14, 2009, 03:28 PM
Neil Jarvis
Neil Guildford's Avatar
Surrey U.K.
Joined Sep 2004
2,013 Posts
By the way I'm currently trying to fly the Spark at a balance point of 145mm when measured from the leading edge of the wing where it meets the fuz.

Can anyone please advise me where their balance point is?

thanks
Neil
Neil Guildford is offline Find More Posts by Neil Guildford
Last edited by Neil Guildford; Jan 14, 2009 at 03:33 PM.
Reply With Quote
Sign up now
to remove ads between posts
Old Jan 14, 2009, 07:12 PM
Pursuit of Happiness
Ron101's Avatar
Brentwood, California
Joined Jul 2007
7,190 Posts
your plane looks so good neil
man you were four wheeling..lol (well three)
clean that baby up and hit the pavement

good luck my friend
Ron
Ron101 is offline Find More Posts by Ron101
Reply With Quote
Old Jan 15, 2009, 05:06 PM
Permanently Banned
YellowAircraft's Avatar
San Diego, Ca
Joined Feb 2005
398 Posts
Hi,

I have to agree with Ron. Your plane looks sweet, Neil!
YellowAircraft is offline Find More Posts by YellowAircraft
Reply With Quote
Old Jan 16, 2009, 09:15 AM
Senior Member
Bob P's Avatar
Wiltshire England
Joined Feb 2001
917 Posts
Neil

My CG is at 146mm from the centre leading edge.

At last on Tuesday (13th but my lucky day) I managed to maiden the Spark on tarmac at Colerne. At that CG the take off was very smooth just by feeding more and more elevator until the model lifted off easily with no jump. I had no flaperon or speed brake set. The angle on the ground is a tad positive and I discovered in flight that a couple of clicks of up trim was needed. The model was very smooth and easy to fly and the control response was well damped so I suspect that the CG is safely forward and could be moved back. I set my elevator and aileron low rates to about 70% of the throws in the manual and they suited me fine and the nose could be lifted on the roundout.

I was apprehensive about the landings and spent most of the first flight testing the slow speed handling with speed brake, flaperons and u/c down. As the book says 'don't worry about slowing the model down'. With speed brake and flap settings as the manual the model pitched down when they were lowered. I therefore mixed in 10% up elevator with speed brake. This seemed just a tad too much on the second flight. So I will try 7% next time. The model (Springair wire legs) touched down smoothly with no bounce, even though I reckon I was on the fast side.

In knife edge the model rolled sharply into the rudder so I have mixed in opposite aileron with rudder ready for the next flight. Whenever that will be.

Great fun to fly even on my tired 10s cells, and oooooooooh that sound I'm in love again.

Bob
Bob P is offline Find More Posts by Bob P
Last edited by Bob P; Jan 16, 2009 at 09:58 AM.
Reply With Quote
Old Jan 16, 2009, 11:20 AM
Registered User
Gordon's Avatar
Joined Aug 2000
3,918 Posts
Great news Bob. Congratulations on both your successful maiden, and finding a weather window to perform it!

Looking forward to seeing it in action.

Cheers

Gordon
Gordon is offline Find More Posts by Gordon
Reply With Quote
Old Jan 16, 2009, 12:46 PM
GRX
gettin on the banned wagon
GRX's Avatar
Joined Jun 2008
601 Posts
I wish i had a runway like that! At my field every landing is like landing on an aircraft carrier.
GRX is offline Find More Posts by GRX
Reply With Quote
Old Jan 16, 2009, 01:05 PM
Just here to fly stuff
LeadSled's Avatar
Everywhere
Joined Dec 2005
421 Posts
Hey Bob, Congrats on the Maiden. The Spark is a great flying plane. Glad to see another purple, orange and white Spark.
LeadSled is offline Find More Posts by LeadSled
Reply With Quote
Old Jan 16, 2009, 02:12 PM
Registered User
kevin's Avatar
ohio
Joined Aug 1999
3,585 Posts
I wish i had a runway like that! At my field every landing is like landing on an aircraft carrier.

I know what you mean....its all i can do to get my planes down on this 1000ft runway ... which is why the spark will have brakes
kevin is offline Find More Posts by kevin
RCG Plus Member
Latest blog entry: Video of my HK Cobra
Reply With Quote
Old Jan 16, 2009, 02:19 PM
Just here to fly stuff
LeadSled's Avatar
Everywhere
Joined Dec 2005
421 Posts
Come on Kevin...lol...1000 feet, go ahead and rub it in .

Actually the Spark slows down very well when you pull the nose up. I still do not have breaks on mine and it lands slow enough to stop in a couple hundred feet.
LeadSled is offline Find More Posts by LeadSled
Reply With Quote
Old Jan 16, 2009, 02:25 PM
Registered User
kevin's Avatar
ohio
Joined Aug 1999
3,585 Posts
you think that starfire will fit on there in september?
kevin is offline Find More Posts by kevin
RCG Plus Member
Latest blog entry: Video of my HK Cobra
Reply With Quote
Old Jan 16, 2009, 02:29 PM
Just here to fly stuff
LeadSled's Avatar
Everywhere
Joined Dec 2005
421 Posts
Yes, it will be there, but I might wimp out and add brakes to to the second one.
LeadSled is offline Find More Posts by LeadSled
Reply With Quote
Old Jan 16, 2009, 02:42 PM
GRX
gettin on the banned wagon
GRX's Avatar
Joined Jun 2008
601 Posts
Quote:
Originally Posted by kevin
I wish i had a runway like that! At my field every landing is like landing on an aircraft carrier.

I know what you mean....its all i can do to get my planes down on this 1000ft runway ... which is why the spark will have brakes
that is a "field of dreams", mine is 285'
GRX is offline Find More Posts by GRX
Reply With Quote
Old Jan 16, 2009, 02:54 PM
Just here to fly stuff
LeadSled's Avatar
Everywhere
Joined Dec 2005
421 Posts
Quote:
Originally Posted by GRX
that is a "field of dreams", mine is 285'
WOW, you are putting a Spark down on 285'. You should get an arresting hook for it. That is pretty cool.
LeadSled is offline Find More Posts by LeadSled
Reply With Quote
Old Jan 16, 2009, 09:46 PM
Renegade Fun Forever!!
rvincent's Avatar
Fontana, California, United States
Joined Jul 2004
27,254 Posts
Maybe my new Starfire will land on that strip in Septemer I'd love to make that event. This year I think I may have something for ya'll Still testing our new system for Dynamax fans, but we will have a new 90mm motor for 4.5Kw too JD will have some hot sport jets for 90mm size in about 2 months so I could bring one of those and a pair of Starfires. On hot one, and one INSANE one
rvincent is online now Find More Posts by rvincent
Reply With Quote
Old Jan 17, 2009, 12:50 AM
The blade numbers go up to 11
stumax's Avatar
Sydney, Australia
Joined Aug 2002
4,380 Posts
Great news, Bob! How much power did it have with your tired cells?

Stu.
stumax is offline Find More Posts by stumax
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Comp ARF Impact Bill Mixon Site Chat 5 Nov 01, 2005 04:04 PM
31% Comp-Arf Video Splummer Sport Planes 19 Aug 20, 2005 01:12 PM
Sold Comp ARF YAK 2.6 w. DA 100 Ulf Rieder Aircraft - Fuel - Airplanes (FS/W) 2 Jul 05, 2005 04:08 PM
Comp ARF whistle for AFP Fly-guy Simulators 0 Jan 06, 2005 01:47 AM
NEW Comp-ARF Extra 2x2 kody'd'punk Sport Planes 43 Dec 09, 2004 09:17 PM