Stock Genesis Motor on 5S ?

[brandon49ers]

The stock motor in the genesis is not that great. The motor will fail for sure on 5s, mine did on 4s. I would suggest buying a leopard or a TP power 4082 in runner. The factory motor runs hot. It will not take more than 3s. Check out Fightercat website. They helped me with the same thing

[RHurley]

Ordering my Genesis next week. So glad I have all this info to help as I learn what to do. Luckily I have help from a buddy but reading what others are doing or have tried is always a good thing, so thanks for all the posts

[TristanJones]

I put 2 8amp zippy flight max 2s1p packs in series for 8amp 4s. they are 30-40c rated and give me around 10min run time, they also stay nice and cool where my 4amp 40c turnigy batteries will get as high as 70deg c after 5 mins! I highly recommend this approach as the batteries are cheap and light. I do not mix different amperage or C rated batteries.
I use high temp bearing grease in my flex tube I have no problems with water leaks till about 15-20mins run time then just re-grease while charging.
The can size on the stock motor makes it look a LOT bigger than it is. If you look closely where the wires come out u will see the copper is a good half inch down the can from the end, its the same at both ends.... (I have photos) also the magnet is made of lots of little ones glued together, looks nasty to me! I ran mine on 5s for quite a while (put about 20 packs through it), it still runs fine and would continue to do so Im sure, I run 2 separate water circuits for motor and ESC, using the one pick up in the rudder and the one exit. this helped with temps by 2-4deg depending on the day. That said I would not jam pack after pack through it I always left 30mins or so time to cool between runs. I only ever ran this set up in straight line bursts of about 400mtrs (1/4 mile) then turned slowly and ran back again. With the 440metal prop I saw 79kmh or 49mph on 5s but the ESC and batteries were over 60deg c. when I swapped to a HK 42mm P1.2 metal prop the temps dropped to mid 50s everywhere but speed was down to 73kmh. Also I picked up some of the scorpion out-runner bearing oil, this made the motor run much much smoother, $6 well spent, I recommend it.

Since I am on a very very tight budget I will be running the aqua-star 3974 2200kv on 5s (sometimes 4s if motor and ESC temps are high in summer) with a T180 ESC with extra cap bank and will bypass the BEC to prevent any possible issues there. Im hoping this combo will see 50+mph with a m445 prop and not burn anything up. Though I have my doubts the stock 4mm drive system will be impressed with the 45mm prop and most likely cry enough. Aside from upgrading the Flex drive can anyone see any issues with my plans?

What are you guys using for flex shaft grease? Id like to find something that works as well as high temp but with a little less drag if possible.

[1945dave]

I put 2 8amp zippy flight max 2s1p packs in series for 8amp 4s. they are 30-40c rated and give me around 10min run time, they also stay nice and cool where my 4amp 40c turnigy batteries will get as high as 70deg c after 5 mins! .

Very interesting! Good info. A couple of remarks though. Hobby King describes the Zippy brand of batteries as slightly lower quality than the Turnigy with the Nano Tech the highest rated brand that Hobby King sells. The principle differences between any of them are how they stack up as to cell balance and internal resistance along with an estimate for the number of charge and discharge cycles you can expect out of the battery you choose. The Zippy is rated a about half the life cycle of the Nano Tech series. Still from what you have experienced you are getting good reliable performance and that is great. A concern for me is why the Turnigy 4S battery in your testing causes higher temp readings in your Genesis. Can you tell us what the speed differences are using the 4S Turnigy and the 4S Zippy series batteries? Generally higher temps indicate more effort or power. Since your equipment is fairly constant, I would think the issue is how much current is actually being passed to your electronics. This would be one of those great oportunities for a Eagle Tree data logger. Notice that your 4S Turnigy is a true 40C battery. While the Zippy's are 30C constant 40C burst, not the same thing as 40C constant. All I am saying here is there needs to be a reason for the difference in temp readings and while cooler is better there has to be a trade off between these two examples to explain why.

Regarding flex shaft grease. I use and many of us old farts continue to use OBC marine grease, which has been around for over 30 years. This type of grease does not wash away easily and stays put long enough to do its job. For record runs this is probably not the racers choice, too thick and sticky. For those runs where the speed result is more important I have seen everything from Marval Mystry oil (not grease) to a STP and lithium grease mixture. In your case it is obvious that you are also interested in blocking water intrusion which only a thick paste will do. There are no real wrong answers here. The minor (to me) speed differences you can gain by using lower friction thinner lubricates does not offset (again for me) the lower protection of my flex shaft's life. On a limited budget I would think this is still a primary goal and for other than the satisfaction for achieving that elusive 100 kmh number I would recommend sticking with what has worked well for me all these years.

Dave

[TristanJones]

Hi Dave, Yes a data logger would be very nice to have here, Id love to see voltage drop at full load, RPM and AMP draw not to mention temps on the fly!!!!
I used the following train of thought for my battery change and believe my theory has worked, (however the BEC in my ESC died after the first run with the zippys and I did not have the GPS in the boat at the time unfortunately).
The 4ah 40c 4s (or 5s still rated 4ah 40c) turnigy system (by system I just mean the batteries, in series), batteries were reaching temps of 70c+ the total constant AMP delivery available was (4x40) 160A assuming these batteries actually do deliver as rated.
The zippy system is 8ah 4s
8ah x 30 = 240A constant. With temps down to around 35C after a run. This lead me to believe the boat was drawing more amps than the turnigy batteries could provide. The temps on both the turnigy batteries on either 4 or 5s config were the same which seemed a little odd considering the voltage increase.
I can only assume the turnigy batteries had too high internal resistance AND/OR low mAh rating for the boat.
Im also of the opinion that as there are twice the amps available at all times there will be less voltage drop and hopefully a little more top end speed, though that was not the reason for my change.
Im interested to hear what others think on the matter.

I will stick with the high temp grease for reasons you stated, thankyou for that.

Tristan.