Ernest Butler suggests the following mods can be tried, but are not really necessary.1. Even though thats a really good battery, and it comes with it's own protective case and is self plugging, you can run larger capacity battery's or save some weight by using your own battery with a few easy mod's.
I have run a three cell battery on those motors that come with it once on one that had hobby gear in it,(the gear it comes with probably won't support three cells) but like I said , once. It melted the motor supports.
2. It comes with prop guards, unless you plan to stick your fingers in the props , I would remove them, before even trying to fly it. It even shows how in the instructions, very easy to do, and gives the most dramatic improvement in flight performance. They also cause some drag , so you do lose some flight time.
The rest will void the warranty , and is meant for hobby guys, from Ernest personally.3. Do the common spring mod, like the aero ace, on the transmitter, then it will fly hands off.
4. Cut off the horizontal, yes , thats right, cut it off. Its much more maneuverable without it. Its just there for looks and helps strengthen the verticals. It also provides a little of the self recovery, but mostly it just kills the effectiveness of the elevator. I have tried running the upper as an elevator too, but it's just unnecessary weight really.
As for removing the horizontal. I wouldn't say it flys better so much as it is more maneuverable. The horizontal serves as the trim for level flight. This allows the elevator to trim level with the main deck, and act in some way, as more wing area.
Removing the Horizontal requires that you trim the elevator up about 3 degrees (which would be hard to put in the instruction). And it loses a little of the self recover in a dive. But the airflow with full up elevator is not blocked by the upper horizontal, making the elevator more responsive.
Experimenting with different size verticals and horizontal, And changing angles is always fun. Its a give and take in performance , function and can greatly change flight characteristics, good and bad
5. Strip the battery down to just the cells and install you own plug, like deans connectors. It will weigh less and then you can use your own battery's and charger if you already own some in that size range.
Lipo Battery Warning!
I feel I must say that i can't recommend that just anybody go prying apart the stock battery unless you feel like you know what your doing and are willing to take the risk in destroying the battery or worse . The few samples I had were relatively easy to take apart but that could change if they use more glue on the battery case seams.
Any 7.4 volt lipo will do as long as it around the same weight and can handle at least 10 amps continuous. The case and the connecting pins that the stock lipo comes and boat uses weighs about 14 grams alone, So if you do away with it you can save quit a bit of weight or run a larger capacity battery. I have run up to 1050's on mine.
I shouldn't say any lipo, cause some brands that I have just won't put out the power that other brands will. Especially compared to the cells that are made for the Hydro.
6. If you don't care about looks, and want pure flight time and performance, remove the intake and exhaust, then the decals. It won't look as cool but it will be lighter. I think it does just fine with them all on though, but if your looking for that last gram....
The empty weight (no battery) should be around 7.3 Oz's in stock configuration.
7. The equivalent hobby gear in weight and performance would be a receiver the weight of a GWS receiver and two striped down 5 amp GWS speed controls or similar. Also a 8 gram servo or less. Its easy to get into the radio compartment to change over. Of course you would need a computer radio with mixing to make it work.
8. Good way to save 4 or 5 grams by carefully removing the shrink wrap and using corrsion X.
9. Transmitter mod. I just Hot glued the top of some hobby sticks from a hobby transmitter, on top of the joy sticks. Use threaded rod for a more permanent solution.
I did this mod all the time with my game pads for computer flying games. Just felt better to me cause I fly RC so much I guess. Plus you almost have to, if you fly using two fingers on one stick. I don't but some do.
Attached Images
Just unscrew the tops off a old Hobby transmitter and mount them on.
10. The motors are real similar to these here
http://www.bphobbies.com/view.asp?i...100&pid=V738321 but are a few grams heavier. The magnets in the BP 130 are stronger and lighter ( cost more) but the armature has a cold wind. If you take the armature out of the Hydro and insert into the BP 130, makes for a lighter motor with good power.