DF 23 Sniper new @ OSE, Yeah Baby!!

[Tunda]

Steven are you going to get the kit also?

[Steven Vaccaro]

Steven are you going to get the kit also?

I'm not sure. I have to check on the price difference.

[befu]

Don't see how they expected a 37mm outrunner to power a 40" boat????

How fast is it supposed to go and what size prop does it have? I have a 36mm outrunner powering a large 40" long scale scarab hull with a x442 or x445 prop. Works great, but it does only go 30mph. Still, it is fun to run as a scale looking offshore boat. (motor looks really tiny in that large hull!)

I agree if they want 40mph seems like it would be pushing it. How long is the outrunner also?

Brian

[Brushless55]

How fast is it supposed to go and what size prop does it have? I have a 36mm outrunner powering a large 40" long scale scarab hull with a x442 or x445 prop. Works great, but it does only go 30mph. Still, it is fun to run as a scale looking offshore boat. (motor looks really tiny in that large hull!)

I agree if they want 40mph seems like it would be pushing it. How long is the outrunner also?

Brian

not to jack this thread
but this is the outrunner he was talking about that came in my Outlaw OBL
its for sale

[ray schrauwen]

MAnual shows that it was to run on a 225 prop stock.

Kv was 1500, not sure on stock battery voltage requirements but, 4S to 5S sounds right. Remember it only has a Seaking 60 amp esc so, don't push it.

I'll give you a whoppping $20 for that motor shipped to my door or $20 just for the cooler if it can be removed as a separate unit?

The motor i think is only rated @ 50 amps.

[Brushless55]

MAnual shows that it was to run on a 225 prop stock.

Kv was 1500, not sure on stock battery voltage requirements but, 4S to 5S sounds right. Remember it only has a Seaking 60 amp esc so, don't push it.

I'll give you a whoppping $20 for that motor shipped to my door or $20 just for the cooler if it can be removed as a separate unit?

The motor i think is only rated @ 50 amps.

It says upto 5s on this motor, its never been ran Ray
I remember Darla at RCU getting jacked around with her boat
someone on youtube has the OBL running 5s with a CF45 prop and it looks real good
so on 5s it could get 800-1000watts
I think in a 26-29 mono it could do very well

[questtek]

Ran the Sniper with the larger HobbyKing water cooled 2-pole inrunner and 90 A SeaKing ESC.
I attached pictures of the Eagle Tree computer Max readings data dump and the EagleTree Power Panel Max readings.

Interesting to note there is a difference, much greater than I would have expected.
There is a difference in 2 mph on the GPS speed, 6 Amp difference in max draw, and 12,000 RPM difference on the max recorded values.

The max motor temp was 125.1 and the low pac voltage was 9.7

I GPS this boat at both 43 and 45 MPH but on a different set of batteries. The LiPos I used 2 x 3s, 2200mah, 25 C are getting pretty tired after lots and lots of test runs. This will account for the slower speeds, in fact the max speed the battery voltage was about 10.1 VDC only!

Important to note for those considering the use of a small ESC is the amp draw I measured. It was pretty consistant at over 100 amps which the 90 Amp SeaKing handled well.

The oscillation is also out of the boat (side-to-sde rocking). This was due to a combination of a bent motor shaft and trim tabs that were incorrectly set. Correcting both of these poblems and the sniter runs stable, true and like an arrow.

[questtek]

Recharged the battery set fully and did another nearly identical run with the DF Sniper. (just a bit shorter)
Pictures show the results
In comparing again the Eagle Tree Computer Max outputs compared to the onboard Eagle Tree Power Panel Max outputs we see:
GPS speed difference is 2 MPH or a difference of almost 6%
Max amp draw is a 7 AMP or almost 7% difference
The RPMS were both EXACTLY the same as I would expect.

The max temp was 115.5F on the motor and the draw 1146 mahr, due to a slightly shorter run than previous.

Note that the max watts out of this water-cooled inrunner small motor was 1143 or about 1.5 HP !

I included a pic of the Turnigy LiPo packs used. You can see the bottom one is a bit puffed!

It is clear that I ned some of the new carbon nano-tube, hi draw battery pacs.

[ray schrauwen]

Once you feel the puffed pack is toast, can you cut the shrink off carefully as not to puncture.

I would like to know if the 3S packs have both + & - tabs on one end or if they are on apposing ends.

If they are on apposing ends, this may contribute to the puffing as there would be an extra conductor needed to go from the odd cell to the front of the pack.

The 3S Nano tech cells I have, 25-50C 4500's have both tabs at one end of the cell which I feel is superior to the old methods I've heard of with an extra "weak link" conductor to get the leads to come out of one end only.

Older odd numbered packs of 3S & 5S with a tab on each end had this weak link so to say and was a cause of some early failures. Apparently, this was first noticed by the Heli guys running 3S packs etc...

So my curiousity made me cut open my brand new 3S nano's

[Brushless55]

Dang I need to just pull the trigger on one of these and try 4s on the stock setup!

[questtek]

Dang I need to just pull the trigger on one of these and try 4s on the stock setup!

Do you really think that tiny brushless will handle it? Who knows, the small HobbyKing inrunner, (3900kv),r I am using has the following specs:
http://www.hobbyking.com/hobbyking/s...idProduct=8594

Even at 3s that is a LOT of RPm's to handle.

[questtek]

Here are the batteries I am thinking to get for the Sniper to get some real potential speed.
http://www.hobbyking.com/hobbyking/s...dProduct=11953

However, these cells in a 2pac configuration will weigh 634 grams and the Turnigy 2200's twin pacs I am running now weigh 388 grams. I will get lots more omph....BUT the weight increased by almost 40%. I will have to think about that a bit more. Maybe a single 4000 mahr 3s Nano pac would be better like:
http://www.hobbyking.com/hobbyking/s...dProduct=11954

This seems like the best solution at 375 grams, $45, and you can pull 4 x 45 or about 140 AMPS which I need if I believe what the Eagle Tree is telling me at now pulling near 120 AMps. This just might be THE Sniper battery of choice for me.

[Brushless55]

Do you really think that tiny brushless will handle it? Who knows, the small HobbyKing inrunner, (3900kv),r I am using has the following specs:
http://www.hobbyking.com/hobbyking/s...idProduct=8594

Even at 3s that is a LOT of RPm's to handle.

on 3s I think that's going to be to much rpms on that HC motor?

[questtek]

Run 3 of the day with the DF Siper.
Rather than wait for a new battery to come, I built my own pac. I had a few 5000, 40C, 4s pacs that were brand new. I just CAREFULLY, cut out one of the cells making it a 3S, 40C, 5000 mAh pac for the Sniper. Weight of the pac only 418 grams. Pics show the 3S next to the factory 4s pac.

Charged the battery and ran the Sniper, getting about 1/2 lap before the Deans on the Eagle Tree came unsoldered. Even with very short run and certainly no where up to speed, you can see the Eagle Tree Data. (I left off the Eagle Tree Pwer Panel).

GPS speed 40 MPH even it a very short distance and not full tilt. The motor only up to 92.4F and I used less than 10% of the battery capacity.
Note also the Amps and RPM. (I have his calibrated for th Eagle Tree brushless RPM sensor as a 2-pole motor, could I be wrong?) I will re-do the connectors and save the next run for the future. It's cocktail time............

[ray schrauwen]

I'll say it again, I think that 2 pole motor will pull more amps than an outrunner, say a 2500Kv or as i am going to try, 1860Kv on 4S. Higher voltage, less amps... Outrunner with much more torque than the 28mm inrunner. Have you ever seen how small the rotors are on a 28mm motor? Teeny Weenie.

If you ran a Leopard 28mm 4 pole motor you would see alot better performance also.