P-Limited Motors - Im going to jump on the hot seat.

[Flanders]

i run the Promarine MTR. if someone said i could run my rtr motor, the 2030 would be out in a heart beet i liked the way it ran before

[RandyatBBY]

Randy,

I've researched hi-Amp fuses... it's not... NOT... as simple an implementation as you might think.

You have my ear, it seams it would eliminate the grey area. I am a nuts and bolts guy what makes it so complicated?

[Darin Jordan]

Most (not all) of the RTR 4s boats come with a motor that is less than the 36x61 limits we have been tossing around.

You'll want to make those Limits 36.3mm x 61.2mm. That's based on real-world measurements of already approved P-LTD motors, as well as several motors that have been tossed around over the past year (TP3660-1950KV, etc.).

I think you'll find that's a very reasonable limit.

[Darin Jordan]

You have my ear, it seams it would eliminate the grey area. I am a nuts and bolts guy what makes it so complicated?

All of these fuses have parameters. Some are flat out "blow" at the Amp Limit. Others are various rates of slow/fast blow. The tolerances are pretty broad, much like with our ESCs and motors, so "BURST" rates on, say an 100-Amp "Slow-Blow" fuse might be as high at 175A for 5-Seconds. Hell, that's the length of a straightaway.

Trying to pick the "right" fuse would take a lot of research. Trying to TECH the right fuse sounds to me like a nightmare.

I like the idea, but would the implementation would likely be troublesome, especially considering the number of people in RC Boating who still struggle to understand mAh, paralleling vs. series, etc.

[Darin Jordan]

You'll want to make those Limits 36.3mm x 61.2mm. That's based on real-world measurements of already approved P-LTD motors, as well as several motors that have been tossed around over the past year (TP3660-1950KV, etc.).

I think you'll find that's a very reasonable limit.

P_LITE_MOTOR_DIAGRAM_INRUNNER.jpg

[RandyatBBY]

All of these fuses have parameters. Some are flat out "blow" at the Amp Limit. Others are various rates of slow/fast blow. The tolerances are pretty broad, much like with our ESCs and motors, so "BURST" rates on, say an 100-Amp "Slow-Blow" fuse might be as high at 175A for 5-Seconds. Hell, that's the length of a straightaway.

Trying to pick the "right" fuse would take a lot of research. Trying to TECH the right fuse sounds to me like a nightmare.

I like the idea, but would the implementation would likely be troublesome, especially considering the number of people in RC Boating who still struggle to understand mAh, paralleling vs. series, etc.

Thanks for the info it makes sense to me now.

[Darin Jordan]

Thanks for the info it makes sense to me now.

I did buy several variations to test the theory, but haven't gotten around to actually doing the testing.

You'd really need something that could handle 80A to 100A continuous, but would deal with short spikes to 130 or so to account for normal P-LTD amp ranges. Getting that combination will take some research/testing.

[dethow]

[ATTACH=CONFIG]144773[/ATTACH]

Looks good.
What is a real world time frame in which we may see a proposal made for the change?

[Darin Jordan]

Looks good.
What is a real world time frame in which we may see a proposal made for the change?

That would be up to people up the food-chain. I'm just a PSFEMBC member who decided to write something up our club could use.

The process is, normally, for a District Director to agree to propose it, then they would take it to the NAMBA board to decide to put it out for a membership vote.

[Darin Jordan]

Looks good.
What is a real world time frame in which we may see a proposal made for the change?

That would be up to people up the food-chain. I'm just a PSFEMBC member who decided to write something up our club could use.

The process is, normally, for a District Director to agree to propose it, then they would take it to the NAMBA board to decide to put it out for a membership vote.

I don't actually expect to see any change Nationally... Perhaps a club or two... I know some guys in our club are interested. They've already been running "other" motors which were involved in my motor testing for the past season (TP3660-1950, etc.).

[JohnZ]

So let me get this straight; with my JAE 21 FE, I'm going to run it with a TP Power 3630/2200KV motor, 4S pack but the motor has too high KV to run as P Ltd. So then I would have to either drop down to 1950 or can I use a smaller prop?

[Doug Smock]

IMPBA has offshore rules? I haven't read the book lately. Maybe I missed it.

Late to the party here.

No FE off shore rules in the IMPBA. That's not to say you can't run the class.

[Doug Smock]

I think, and maybe Doug Smock or someone can chime in here, that the IMPBA has an official "proposal and then testing and then official" type of implementation for some of their rules. I'm certain NAMBA doesn't officially have that.

Again late to the party.

1. Rule Proposal under General Rules of Competition, Contest & Racing Rules, Technical
Standards, and Classes
a) Option #1 - All rule proposals supported by a majority of the Executive Board, will
automatically undergo a trial period for one year (except as noted in section 1, C). After
one year, the proposal will be distributed to IMPBA membership with a ballot that will
require a head count for and against the proposal. Ballots shall be returned to the
respective District Director or the IMPBA secretary within the time stipulated. The final
vote of the Executive Board will be effective with the next quarterly report.
b) Option #2 - Board members vote by majority to turn down a submitted proposal. This
option terminates the proposal.
c) Option #3 - All rule proposals not supported and not terminated under option #2 by the
Board, will be distributed to IMPBA membership for vote by a ballot that will require a
head count for or against the proposal. The membership vote will determine the
implementation of said proposal and, if passed, will be effective with the next quarterly
report.
All Racing Rule proposals reviewed by the Board will be published in the Roostertail for
one full quarter before being voted on by the membership in the following calendar
quarter with the exception of one-year trials.
d) Option #4- Board members vote by majority to indefinitely table a submitted proposal.
This option allows a proposal to be revisited at a later time determined at Boards
discretion. A majority vote of the board required to re-visit proposal.

[Doby]

So let me get this straight; with my JAE 21 FE, I'm going to run it with a TP Power 3630/2200KV motor, 4S pack but the motor has too high KV to run as P Ltd. So then I would have to either drop down to 1950 or can I use a smaller prop?

Running in IMBPA or NAMBA??

[T.S.Davis]

So let me get this straight; with my JAE 21 FE, I'm going to run it with a TP Power 3630/2200KV motor, 4S pack but the motor has too high KV to run as P Ltd. So then I would have to either drop down to 1950 or can I use a smaller prop?

John, come by and see us. Come spring your setup will likely be legal locally. I literally just dropped that setup in our JAE too.

MMEU will be running it's own spec come spring. I suspect that is. The club has to vote on it but we've been talking about it all summer and most seem to be on board with the idea.