FE Newbie, 1527/2215

[zboter1]

I have narrowed it down to these motors. From the research, All these formulas can be a bit overwhelming. LOL. I Want to thank everyone that post their experieces here. I have been getting a good education. LOL.

have a sprint cat/stryker
sounds like I need to run like 10s2
need a light motor ect. looks like my choices are 1527 1y
2215 1.5y

sounds like from your posts the safe bet is the 2215

it is only a few oz. more on weight.

Also what kind of speed do you think I would be looking at?
with nitro 80/90 engine runs mid 60s.

Do you think mid 70s on FE?

Thanks for your help

[RaceMechaniX]

Welcome to OSE,

You will probably find that the common consesus of those who have built gas size cats is that the 2215 is a safer route. You can perhaps get away with a 1527, but several have tried with mixed results. If you can keep it light with good prop loading its doable. Th 2215 is just more forgivable.

I am in the process of just finishing a similar conquest. you might want to read the post here for ideas:
http://forums.offshoreelectrics.com/...ad.php?t=12817

Also do a search for "sprintcat" and you'll find many good posts on builds, performance and cost.

A good estimate on speed is low 60's with a moderate set-up. If you want to go faster you are looking at larger motors, high amp draw and bigger controllers.

A Sprintcat with a good 8o or 90 will run low to high 70's if set-up correctly.
Tyler

[zboter1]

Rx mechx

What kind of speed do you think you will be getting out of your conquest set up?

What size flex will you be using? Will a 3/16" shaft hold up?

[RaceMechaniX]

I expect speeds to be around mid 60's with only 120 seconds of full power using a 2P set-up and maybe 90 seconds using a 1P set-up.

For a 2215 you will want to use a 1/4" cable with a 3/16" step down at the prop.

You might also want to look at the Neu 1900ZR which is between the 2215 and 1527. They say it will be a good replacement for a gas motor which makes prop selection easy and it should require a less demanding power system. Look at the bottom of the page on this link;

http://www.fastelectrics.com/blmotors1.asp

[zboter1]

wow great info. I sure thought I would be getting a little more run time. Yes the 1900zr is intresting.

Thanks again

[RaceMechaniX]

wow great info. I sure thought I would be getting a little more run time. Yes the 1900zr is intresting.

Thanks again

On gas size boats you need about 3kW consistently to run 60+ mph. A 5000mAh pack will only last for 60 seconds at those speeds assuming safe dischage levels. 1 min at 3kW is 3000mAh.

Of course you can run more packs in Parallel to increase the time, but you will reduce speed due to the extra weight and costs go up.

Tyler

[zboter1]

Dam Tyler you let all the hot air out of my balloon. lol. sounds like I need to run a smaller boat to get what I am looking for. I see a few guys are running the 40 sprint. 80 sprint is only 5" longer and 1" wider. Is it all a weight issue. like say I have a 80sprint that weights as much or less than the 40sprint?

[RaceMechaniX]

You might be much happier doing a 1527 in a 40 size sprintcat on 6S or 8S. The difference is almost double in cost and power required when you go bigger.

Tyler