Pouring the tips. Changing the COG

Changing the COG by using epoxy, resin and tiny little ball bearings. BBs As they are called.  this method is only used as the last ditch effort to changing the COG of a boat.
Normal circumstances battery replacement and electronics can set your COG to preferences
However, some cases extra weight is needed to manipulate the Cog. Scale boats are common to add weight forward.
The boat was pretty to begin with and everything was maximum to a forward setting. Adding only other option to this.
 not the best solution as adding weight is not always good. Only do if necessary

[@RogallaMarineRC]

Sweet!

[@k.f.w.6585]

Good idea to clean those BB's before epoxying them in. Alcohol, whatever.

[@jamesdash1906]

I've NEVER added weight to any of my boats.you move the motor esc battery's.adjust the strut ,shorten or lengthen turn fin .adjust your wings.try a lifting prop

[@mad_lizard]

Yes. I hate adding weight. But had no other option. Cog 3 inch’s behind the fin.
For hydro really needs to be 1-2 inch’s behind the sponson. Center of fin. Battery was max out going forward in the battery location.
Strut was set to 30 mm. 10 mm deeper than the height of the trailing edge of the sponson. Lifting prop sure would have helped. Blow overs were not really the issue. More the turning at speed.
It’s very common with 1/10 scales to add weight. The rear wings are 8 oz on the tail off setting Cog as well.
Hard to compensate to a bad Cog of the hull. Weight was the only option.

[@erickburd6495]

What brand of hydro is that?

[@OGPAPERBOY77]

If you dont want to drill it out next time you can add tubing to the syringe and get in there
🤙🛥️

[@mad_lizard]

Yes, if that was an option, I would’ve done that definitely. Unfortunately with the framing of the hull as to the bulkheads there is no access point to get into the sponson tips. Sponsons are completely sealed with no access. Drilling was the only option

[@OGPAPERBOY77]

@@mad_lizardoh ok thank you for the info