CG Adjustments / Mod changes

[hghost]

I see many Mods done to the SC. Of course all Mods change weight and a tail heavy and or an extreme nose heavy plane equals disaster.

I see video's and talk about Checking CG and one with a unique cloths hanger jig to check CG.

My question and wonder is when checking CG and if a tail heavy or nose heavy plane, many suggest buying lead weights that stick on to add weight either on the nose or tail. On the cub the Nose cowl would be a nice place to hide some weight, but in case of a nose heavy plane, what would one do with the tail weight ? Being foam and no place to hide any weight, any suggestions ?

And instead of using lead weights , what else is a good idea to add to adjust the CG ? Is there a better way to adjust CG without adding weights ?

And another question when adding larger wheels,wood on wing saddle and battery box reinforcements, clear tape covering, I am sure they all change the CG and add weight, will the stock Cub handle the weight changes ( adding weight for example ) ? I purchased the New Super Cub DSM RTF.....how much can the Cub Stock version stand before one would have to have a larger motor, which would need a different battery and a different ESC to handle it all ?

How much is to much ?

Seems the Cub has plenty of power as is Stock and could stand some added weight, but seriously, how much is to much ?

[realbob]

Hum... a brick is too much!!!!

I added some washer inside my aluminum motor mount. You can also harden the cowl itself which will add some nose weight. Larger wheels would also affect. If Nose heavy, you cann remove the fowm with holes under the cub and glue some weight on it and replace on the plane, that should to it.

But as always, always read flydiver advices! Much more experienced and whisely said.

[flydiver]

It's more advanced building but when you can use components that are necessary and get the job done placing the CG properly. The Cub motor+gearbox is something like 130g. So, you can put a decent size motor up there. Lots of folks have mounted the ESC up there also which provides additional cooling, a plus.
If you must add weight, use leverage. Put as little weight as far away from the CG as possible.
Say you were nose heavy > better to tape a dime on the tail than put 2 quarters somewhere inside closer to the CG point.

[hghost]

Flydiver, Thank you again.....your expertise is like gold.

[hghost]

After all the Mods done , battery box reinforcement, wing saddle enforcement, larger Wheels and larger tail-wheel, adding some decals , and packing tape. Screen wire in cowl and taping the inside in case of cracks. Wing strut eyelets instead of screws , etc etc etc...

I actually believed my Cub would be nose heavy . I was surprised to see it was actually Tail heavy instead . After setting my CG machine and getting it lined up , setting the Cub on the stand one could tell quickly it leaned toward the tail.

After trying a few weights, and either not enough or way to much, I tried coins. It took 2 Nickels and two Pennies to get it precise. I have no sticky weights and was trying washers and nuts to no avail .

After taping one Nickel and one penny on one side and then another Nickel and Penny on the other and resetting the CG machine and using the level it sets perfectly now. To think 12 cents worth in the Nose is what it took to get her level.

Still not able to maiden her yet , weather here still not cooperating. And the flying field still a swamp....Hopefully in the near future I will be able to get her up. At least I know the CG is perfect now .

I also am going to use a AccuThrow to make sure the control services are level and the throws are perfect .

I also have a Champ that is yet to be flown. And just looking at it out of the box I see the Rudder is set way off and would cause an immediate left turn. I tried setting the trim on the radio to see if it would pull it straight, it will not . So a major adjustment is in order for it.

Reason I mentioned it, I see many videos of people taking off with the Super Cub and upon take off have very quick right or left turns . Not sure if their thumbs are to heavy on the stick or the trim is that far off. I wanted to try and make sure the control surfaces are as close to perfect before I fly her. And after seeing this little champs Rudder so far to one side, I wanted to make sure my Cub was set before the maiden flight.

Any comments , suggestions or advice is greatly appreciated .

[hghost]

here you see the Nickels and pennies and the level.

Then you see the tail heavy view and then the level view on the CG machine in these pics

[flydiver]

What's creating the weight up front? Impossible to tell from the outside picture.

[hghost]

FD the weight was in the tail . The only thing I changed in that area was a little larger tailwheel. It was not nose heavy like I assumed it would be . It is basically stock other than the mods I mentioned .

After I took the two Nickels and two Pennies and taped them inside the cowl on either side, it was level after that .

Hope that is what you were asking ?