JAE21 GE P-Spec

[Eric Bourlet]

Here is a video (http://www.youtube.com/watch?v=98q6tyiyLd0) of my P-Spec running in NAMBA District 8 open hydro class at the last poiints race. It has a UL-1 motor, Turnigy 120 Speed controller and 2 R/C car 5000mAhr batteries in series. http://www.youtube.com/watch?v=98q6tyiyLd0

[Meniscus]

Eric, welcome to the forum!

Man, that is sweet, great job. What prop are you using and where is the COG (Center of Gravity)?

[Darin Jordan]

Eric,

You have that thing DIALED, and WAY to stay on the pins!!

I found an issue with my Raptor that I'm just about finished fixing that may have expained it's "radical" handling... Hopefully I'll have it setup well enough to give you and Brian some fun at the Eugene race later this month!

Get more of those Nitro guys to make the switch! Can't seem to get any of these FE guys to show up, but we'll keep trying.

[Doug Smock]

Very nice Eric!!
Doug

[RayR]

Eric,

Good job drivin the pins! You have that thing smokin!

All the best,

Ray

[FloatDaBoat]

Yeah !!! . . . . A few more laps & you'd have certainly Lapped that Nitro Boat - - HAW !!!

[teach]

Just awsome!

[Eric Bourlet]

Yeah !!! . . . . A few more laps & you'd have certainly Lapped that Nitro Boat - - HAW !!!
Thats the cool thing about the JAE it is easy to drive on the pins. Once I figured how little throw it takes it drives like a Cadillac.

FYI, I did lap the X cat. Man was Frank upset :bounce:

[6S HYDRO]

what prop?

[NativePaul]

Thats the cool thing about the JAE it is easy to drive on the pins. Once I figured how little throw it takes it drives like a Cadillac.

I allways thought that Cadilacs handled like boats, I was thinking of oil tankers though not riggers.

[6S HYDRO]

prop please?

[Eric Bourlet]

H10

[6S HYDRO]

thanks, where did you find one?

[Rumdog]

Geez I need to build one of these!

[Doug Smock]

thanks, where did you find one?

Don't try to pull that prop with the UL-1 ESC. Even back cut 1mm it will pull 80 amps IME.

Doug

[6S HYDRO]

what do you suggest doug, h7

[Doug Smock]

Yes sir. De-tongue it and add some cup and a bit of pitch and go have some fun.
Doug

[Eric Bourlet]

You are correct Doug, mine draws between 84-90 amps, peaks to 130 from a dead start. I have not tried the H7 because it has less root pitch. The H10 is pitched no cup. Keep in mind the JAE is a very loose running boat so it has lower drag than many boats. The Turnigy is only about $50.00 for a 120Amp controller that allows you to change timing.

[6S HYDRO]

im prob gonna run a hydra 120

[6S HYDRO]

where can i get some abc h props, steve doesnt have em

[detox]

where can i get some abc h props, steve doesnt have em

Yes he has them !


...

[6S HYDRO]

it says the h7 is a larger dia. than the h10 but with less pitch, seems if your gonna cup and pitch up the h7 why not use the h10- ill be using a hydra120

[Doug Smock]

The specs on the UL-1 motor are.
Max.constant current 50amps.
Max.surge current 80 amps/5 sec.
We are going just as fast with the modded H-7 as we could with the H-10 and with less load. We were on a quest for 1mph/amp., and dang near did it.:cool:

Having said all of that. I've heard the motor and esc are under rated, so I guess there is nothing wrong with pushing them a little harder.

Have fun!!!
Doug :beerchug:

[Eric Bourlet]

The specs on the UL-1 motor are.
Max.constant current 50amps.
Max.surge current 80 amps/5 sec.
We are going just as fast with the modded H-7 as we could with the H-10 and with less load. We were on a quest for 1mph/amp., and dang near did it.:cool:

Having said all of that. I've heard the motor and esc are under rated, so I guess there is nothing wrong with pushing them a little harder.

Have fun!!!
Doug :beerchug:

Doug how much pitch and cup are you putting in the H7? BTW the UL1 motor does fine at 80-85 amps.

[Eric Bourlet]

The specs on the UL-1 motor are.
Max.constant current 50amps.
Max.surge current 80 amps/5 sec.
We are going just as fast with the modded H-7 as we could with the H-10 and with less load. We were on a quest for 1mph/amp., and dang near did it.:cool:

Having said all of that. I've heard the motor and esc are under rated, so I guess there is nothing wrong with pushing them a little harder.

Have fun!!!
Doug :beerchug:

Doug how much pitch and cup are you putting in the H7?

[6S HYDRO]

just got my h-7 in the mail, so i leave the dia. the stock 47.5mm

[Doug Smock]

Hi Eric,
A pitch guage has been on my list of "wants" since 06 but there is allways a "must have" that put it on the "one of these days list". LOL
Long story short. UL-1 motor and ESC , new Hyperion 4s 5000 35C.
I did all of my testing with a Eagletree Seagull , 100+ amp sensor and the GPS expander. I was testing several props to start with (1450s,H-10s, S15s with various mods, reduced back cut ect.) but landed on the H-7 pretty quickly (two weeks :olleyes:) because I was just plain going 3 to 5mph faster with less load.
First I started adding some cup to flatten out the roostertail. Then it was several runs over a couple of weekends edit:adding pitch, trying to go 60mph pulling 60 amps. I ended up running 57 to 59 consistantly pulling 63 amps. The warmest thing in the boat is the motor wires at 109'F after a 1mile heat race.
What I found according to Eagletree is that after about 65 amps the UL-1 motor just won't give me any more and this was true with all of the props tested.
I am by no means a prop expert, but I've spent more time with props on this boat than any of my other boats except maybe my SAWs monos. It was fun and I learned some things, but I think I'm done until somebody hands me my tail at the races. Then I'll be lookin at his prop. LOL
Sorry I didn't have some solid #s for you. Got an extra pitch guage??LOL

Doug :beerchug:

[Eric Bourlet]

Thanks Doug, so you only added cup? BTW I just finished my gage. I built one with a dial indicator. It was actually rather easy to build. I did find that I had to modify it to get repeatable readings though. The standard way the guys build them cause the ball on the dial indicator to get in the way and mess up the readings. I added a pointer that gets rid of the problem. If you have access to a lathe I can send you pictures of the one I made. You could probably do it with just a drill press.

[Meniscus]

Eric, I'm very curious as to what your gauge looks like and I know our local prop guru would love to see as well. Do you mind posting pictures here, even if it's in another thread?

Thanks!

[6S HYDRO]

i have access to a lathe and a dial indicator, please shoot some piks

[Doug Smock]

Thanks Doug, so you only added cup? BTW I just finished my gage. I built one with a dial indicator. It was actually rather easy to build. I did find that I had to modify it to get repeatable readings though. The standard way the guys build them cause the ball on the dial indicator to get in the way and mess up the readings. I added a pointer that gets rid of the problem. If you have access to a lathe I can send you pictures of the one I made. You could probably do it with just a drill press.

No sir I added pitch also, just edited the post. :oSorry.

I'd like to see some pics for sure. Please send them to smockrc@bellsouth.net.

Thanks,
Doug

[Darin Jordan]

Hey Guys... I saw Eric's pitch gauge this weekend. Nicely done. It basically looks like the pic I attached, but it's larger scale and with some features that make it more user friendly. Hopefully he'll post some pics so you can see. He does nice work.

[Eric Bourlet]

I started a new thread titled My Pitch Gage in the Boat Building Tips section (http://forums.offshoreelectrics.com/showthread.php?p=188416#post188416).
It has a link to the original article from T-Mod racing and an explanation of what I changed to make it work better for me along with this link http://s104.photobucket.com/albums/m171/ebourlet/Pitch%20Gage/ to photos of the one I built. Thanks Mike from T-Mod Racing for the original article I based mine on.