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Advantage Hobby . Revolution Models . CarbonXtreme

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Scale Model RC Helicopters > MD 530 CG question
 
 
turbo35
Senior Heliman
Location: Southern Ohio

I just got finished putting my Raptor mechanics in a TT MD 530 civi body (it looks great). But the CG is way off and I am having to add lots of weight up front to make it level. I had to put a 5 cell subC battery pack in as well as leaving the 4 cell double A pack for ballast and I had to add some lead just to balance the heli. Has anyone else had the same issue with the TT MD 530 scale body with Raptor mechanics? Is this fairly common on scale project to have to add more weight to CG balance? This just seemed a bit accessive to me. Thanks in advance for the info.

BEAM TEAM USA
07-22-2008 05:14 PM
 
 
BarracudaHockey
rrMaster
Location: Orange Park FL

Make sure you have the tail servo up front and do away with the push pull collective, that helps if you're using the titan.

Also a big battery. Its not critical to get it perfect as you probably won't be doing much inverted work with it so get it close and trim it out w/o making it weigh a ton.


AMA 77227
http://www.jaxrc.com
07-22-2008 07:58 PM
 
 
mylee
Senior Heliman
Location: Rochester, UK

Mine was the same. Balanced nicely until the T tail was fitted
07-22-2008 08:13 PM
 
 
Rodan
Senior Heliman
Location: Prescott Valley, AZ

I've got a 4500 RX pack, plus some lead up front in mine... don't worry too much over it. Most scalers take a lot of weight up front to balance.
07-23-2008 04:53 AM
 
 
SpottedCow
Senior Heliman
Location: Whetstone, Arizona

If your going to add weight (which the MD530 requires alot of) just use it to your advantage by adding something cool looking. For example... I added this light to mine... balances the heli perfect. I got it at Lowes for $15. The only downside was that it is a 12V AC light.. so I need to convert it to a 12V DC.

I built a balsa tray (the older kits came with one I think... mine did not) to provide support for the light... and to provide somewhere to mount an additional 4 cell battery to power the light.

07-23-2008 06:12 AM
HOMEPAGE  
 
 
Dave Willis
Senior Heliman
Location: Sevierville, TN USA

CG

Mine was tail heavy also. I was able to pop apart the wood former in the front of mine. I added the weight to the inside of the former box and then glued the top back on the former. Worked out good, the lead is hard to see and if it came loose it is unable to go anywhere.

Dave
07-23-2008 08:47 PM
 
 
sewu
Senior Heliman
Location: 94132

CG

My is tail heavy before I added 6oz weight at the tip of canopy, see picture below, althought it does adding more weight onto it, but with the way that scale heli flys, It has tons power take it anywhere you want.
Raptor 50 with OS 50, running 30% nitro.

Flying more flys better.

Regards

Sean

07-24-2008 04:01 AM
HOMEPAGE  
 
 
artimus
Veteran
Location: Puyallup WA

MY first venture into the scale world. I just put the body on my Raptor 50 .....mine is just a little tail heavy. Should I just trim it in flight or add weight to it? I wont be doing loops or inverted with this one . This Body went together very fast and looks great too.
By the way it is a TT MD 530 so it fit with no mods.

AMA #890376..... Flying Helis is like sex ...you dont have to be good at it to enjoy it....
07-25-2008 10:28 PM
 
 
SpottedCow
Senior Heliman
Location: Whetstone, Arizona

Always balance your heli... it will make if fly better... I originally flew my MD530 with tail heavy... then added the light to balance it... it flew alot better after balancing.. smoother.. and less drift. Also noticed in a hammerhead the tail was quicker.
07-27-2008 08:24 AM
HOMEPAGE  
 
 
SamZam
Heliman
Location: Back to Sunshine State

Quote 
MY first venture into the scale world. I just put the body on my Raptor 50 .....mine is just a little tail heavy. Should I just trim it in flight or add weight to it? I wont be doing loops or inverted with this one . This Body went together very fast and looks great too.
By the way it is a TT MD 530 so it fit with no mods.

I too have not done nothing to my MD 530. My tail servo is in the boom with no problem. Lot quicker in flight. As you said ( should i just trim it in flight?) I did and it fly's great, no drift only thing is that because of the metal heads i have to use 620 blades, flybar weights to slow it down a bit. They are not made for inverted flight anyway why the mods?..

My Airwolf in other hand is a drifter, tail heavy. Funkey airwolf with a Raptor 50 mechanics also with metal heads..I already add 4 cell 3300mah batt. pack for lighting in front and a Fromeco reg. with batt to get the front even with the tail. With a little trim afterwards it fly's great.

My next project is on the works..Also with Raptor mechanics..IMO Raptor fly's great on a scale. I was just wondering if the Raptor mechanic fits the LAMA fuse?
07-28-2008 12:53 AM
 
 
west-wot
Senior Heliman
Location: u.k

what is the proper way of c of g ing a scale heli
07-28-2008 02:14 AM
 
 
turbo35
Senior Heliman
Location: Southern Ohio

Same as a pod and boom setup, lift the heli under the flybar close to the flybar cage with the main blades front and rear. See if it balances straight when you lift it up. Add weight or move the component forward or backward to balance the CG the way you like it. My MD530 is awesome, it is balanced perfect and flies great. I did 3 demo flights this weekend at a local fish fry that our field sponsors. People were amazed at how real it looked and flew. Must be the pilot

BEAM TEAM USA
07-28-2008 03:45 AM
 
 
sewuSenior Heliman - Location: 94132 -
Agree with Trubo35, my MD530 balance is perfect, it weights close to 11 lbs, but flys great, pitch set as -2 to 10, headspeed is 1750, it can auto as well with TT cabon blade.

07-28-2008 04:13 AM
HOMEPAGE  
 
 
SamZam
Heliman
Location: Back to Sunshine State

Since you guys talk about the balance forward and aft...How about the side to side?..Have any of you really balance the heli right?..You got the front and tail how about the ailerons?.Let the trim take care of it..right?..So in other words your just balancing the front and tail...Why go to all those troubles when you can trim it at your radio?
I have mine +- 9 both ways..with 1800 RPM..
07-28-2008 04:21 AM
 
 
artimus
Veteran
Location: Puyallup WA

I had a chance to do my Maiden Flight this weekend and the balance was good with a double lipo pack in parallel. It will take some getting used to flying this Scale body. It sure flys different then than without the scale body on it. It drops a lot faster and takes more time to recover form a fast descent....it also has a tendency to pitch up very fast in forward flight. It was a little windy today. I just have to tone down the cyclic response some ....may switch back to my black paddles and some flybar weights. I have turned down the head speed for a more realistic rotor sound with good results.
I was very pleased with the flights.

AMA #890376..... Flying Helis is like sex ...you dont have to be good at it to enjoy it....
07-28-2008 06:42 AM
 
 
SpottedCow
Senior Heliman
Location: Whetstone, Arizona

Quote 
Same as a pod and boom setup, lift the heli under the flybar close to the flybar cage with the main blades front and rear. See if it balances straight when you lift it up.

That is one way to balance, but there is a better way to check if tail/nose heavy. Stand in front of heli.. grab the blade grips (not flybar) one in each hand (so blades are perpendicular to fuse)... lift the heli and lean it to the left... the heavier end (nose or tail) will fall... BTW.. when you get it right it just seems weird that neither falls when you have it almost laying on it's side... but that is where you want the balance. Also it is a good idea to do this with about a 1/2 tank of fuel.
07-28-2008 09:23 AM
HOMEPAGE  
 
 
BarracudaHockey
rrMaster
Location: Orange Park FL

I put black paddles, soft dampeners, and moved the washout back to the inner holes on my MD so it flys more scale like and smoother.


AMA 77227
http://www.jaxrc.com
07-28-2008 12:35 PM
 
 
artimus
Veteran
Location: Puyallup WA

SpottedCow
That is a great way to balance your heli. I do it with all my helis and makes sense to do it with thw Scale ship too. I dont like the idea of adding weight to it to balance it. Maybe making a longer battery platform to set the batteries out closer to the nose.
The other issue I need to address is the cooling of the engine. It seems to runs a little hot so I tried 15% and got it to run cooler but lost some power......any body have the hot ticket fix for a hot running scale ....
I am hooked on scale flying.....I put 5 flight on it yesterday and only one on my R90. Now to find a scale body for the R90 and a bigger truck to haul them with.

AMA #890376..... Flying Helis is like sex ...you dont have to be good at it to enjoy it....
07-28-2008 04:42 PM
 
 
SpottedCow
Senior Heliman
Location: Whetstone, Arizona

Most people just leave the side windows out. Its much easier to make adjustments that way. I fly in AZ.. and it can be quite hot outside. I fly 30% due to the altitude 4500 ft and so far no cooling issue.. both my side windows are out... I fly a OS Hyper 50.
07-29-2008 05:39 AM
HOMEPAGE  
 
 
artimus
Veteran
Location: Puyallup WA

The windows were the first thing I chucked when I opened the box.....Turns out I had a fuel line with a micro pinhole in it right at the nipple on the vent line on the main tank....now its making better power and still a little hotter than I like to run but still not cooking the motor......I pumped the exhaust out the back with a long Z bend tube and silicone muffler deflectors......that might add some back pressure and some heat to it also. Maybe a little bigger tubing so as to let it breathe a little easier......????

AMA #890376..... Flying Helis is like sex ...you dont have to be good at it to enjoy it....
07-29-2008 06:12 AM
 
 
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Scale Model RC Helicopters > MD 530 CG question
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