H&M Intruder twin build

[tlandauer]

Somewhat dissapointing maiden


Well, I had little time today and thought I will give her a try.
Since I am still trying to figure things out, I used a pair of Graupner 40mm K series props.
Long story short, for the first run I took her in below 1 min. and the motors were hot, like 160*. I know Outrunners tend to run hotter, but this was accompanied by the all too familiar lacquer burning smell. No smoke. ESC was 98*, batteries were barely 90*.
I let it cool down and had another run. Same thing. Now the smell is stronger and the boat feels as if she is hesitating, more like stepping on the gas pedal in a small tiny engined car, there is no build up of speed.
I couldn't get a GPS reading, I think the fastest was mid-40s. (mph)
These are FighterCat 3126/2200kv Outrunners. Per their suggestion, I set my timing at 15*.
Well, I won't chance these motors anymore, good thing i have a pair of Scorpion 3026/1900kv Outrunners I bought from Jason. Scorpion suggests timing between 5-15*, I set at 11.25*, is that OK?
Should I be using even smaller props? like 36 or 38mm props?
Boat gets on plane and is not running excessively wet. No binding in the drive lines...
In goes the Scorpion:DSCN7677.jpg
out comes the FighterCat:DSCN7680.jpg

I wish the kv is a bit higher, hopefully these motors will ultimately swing a bigger prop.

[ls1fst98]

Outrunners do run hotter, and from what I've read they tend to heat up and level off between 140 and 160 when you really push them. Those scorpions though are going to be far more efficient and make plenty of power! I'm using the 1400kv version as well in a c5009 build this year.

[srislash]

I don't have a lot of experience with out runners myself, and the one I am running are in a 40"AC hull. I don't imagine there can be a lot of air inside that/your hull. That will effect the heat buildup.

[DINO7]

Change the morors.the hull can take much more props.im running mine-3270kv 3s-with tenshock alu 445/3 props and its very fast from stop to 100km.set the stingers parallel to the hull.

[Heath M]

Hey, that was quick! Can't wait to see your build!
If you have time, can you post a picture of your transom, I like to see if it looks anything like mine.

Yeah it does have the transom fault as yours

[tlandauer]

Outrunners do run hotter, and from what I've read they tend to heat up and level off between 140 and 160 when you really push them. Those scorpions though are going to be far more efficient and make plenty of power! I'm using the 1400kv version as well in a c5009 build this year.

Yup, that is what I thought, but it should not have the burnt smell. I was very disappointed with the FighterCat outrunners.
I would not have the room to run 6s for these 1400kv gems, really glad Jason ( JMSCARD) sold me the pair of 1900kv Scorpions.

[tlandauer]

I don't have a lot of experience with out runners myself, and the one I am running are in a 40"AC hull. I don't imagine there can be a lot of air inside that/your hull. That will effect the heat buildup.

Yeah, I had such ambivalence before the build precisely for this reason, but I would have to use 29xx motors for the inrunners with water cooling, I don't know how Dino7 could have stuffed a pair of 3674 motors in there...

[tlandauer]

Change the morors.the hull can take much more props.im running mine-3270kv 3s-with tenshock alu 445/3 props and its very fast from stop to 100km.set the stingers parallel to the hull.

Only if I have your skills, I could not figure out how to stuff a pair of 36xx motors with cooling jackets there.
Your speed is great, I will have to fine tune mine slowly.
It is also good to know that the hull can handle 45mm props.

[tlandauer]

Yeah it does have the transom fault as yours

At least with German engineering, you can be rest assured that there is consistency!!!!!

[Heath M]

lol this true, although it will be awhile before it hits the water, The hardware i ordered for it 2 weeks ago is still in the states They had run out of one of the items and were waiting 2 - 3 weeks for more stock but neglected to tell me until I asked about it. Luckily though it worked in my favour as I was not happy with what I ordered so got to change it. Happy Days :)
I ordered a custom wind TP 4060 for it yesterday which should make it good for racing :)

[tlandauer]

Scorpion out runner motors ROCK !!!

Ok, I was really lucky to have just bought a pair of Scorpion 3026/1900 Outrunners from Jason.
Mindful of my previous experience, I timed my runs from 30seconds, 60seconds and finally 90seconds.
I would have run longer but I went between my work and time was a limiting factor.
Here are the results:
@30 sec. the motors were barely 98*
@60 sec. they were 106*
@90 sec. they read 116* .
ESC never exceeded 90*
Props are turning inward.
I briefly tried a pair of CNC 42 props, it had more speed but I can tell I needed to adjust the drives, didn't have time. Video was shot running Graupner "k" 40mm props.

It is hard for me to fathom the difference in quality between the Scorpion and FighterCat out runner motors. I am aware the kv is different and it might have accounted for some of the difference in temperature, but still I would say that the temp reading on the FC were way too high. I didn't make any change to the set up. Now I have two nice chromed out runner motors for paper weights. The list is growing...

[tlandauer]

lol this true, although it will be awhile before it hits the water, The hardware i ordered for it 2 weeks ago is still in the states They had run out of one of the items and were waiting 2 - 3 weeks for more stock but neglected to tell me until I asked about it. Luckily though it worked in my favour as I was not happy with what I ordered so got to change it. Happy Days :)
I ordered a custom wind TP 4060 for it yesterday which should make it good for racing :)

I can't wait till you start your build, I think for the size of this hull, single is a better way to go.
Good to hear that you were able to change your order in time.

[785boats]

Glad to see things are working out for you Tim.
I ran a pair of those 3126 2200kv outrunners in a 36" cat for part of last season. They were the Turnigy versions. Didn't see the temps you are talking about though. Had CNC 4214/3 blade props on it with 120A ESC's.

Hey. Heath.
Custom Wind?
What should we prepare for at the next round of EA Cat?

[tlandauer]

Paul, many thanks for chiming in. I certainly wish those motors would have worked, I liked the kv better and I took caution and started with a 40mm prop. Do you think there was something to do with my timing? (15*)
They (FighterCat) no longer have them, I acted on my instinct and got a pair of the Scorpions just in case......
I looked up at HobbyKing and they don't seem to have any Turnigy in that kv as well. I would like to re-evaluate my process. Not ruling out that was my fault.
The temp was consistent on both motors...

[srislash]

You could try higher timing on the FC's. Perhaps later after all is set Tim. I do recall them needing high timing.

Really glad you got a good run in. They don't always GO the first time out. ;-)