Neu 1521 1.5d rigger

[jpracing1997]

I have a rigger thats 33 inches long and 19 wide, and i put a neu 1521 1.5d in it with a h10 prop. I am gonna run it on 4 cells! What kind of speeds should i expect.

[Jeepers]

well that motor can take a lot more prop than a H10, to be honest that motor is not really suited for hydro use, it works but takes a big prop to get it to move I would guess in the mid to hi 50's low 60's with that motor and prop. you may need something bigger to really make it move. something like a Octura 1450 or 1650 maybe, but you may get some unwanted prop walk running big diameter props.

I run a pitched up m648 on my Whip 20 with that motor and have very little to no temp issues don't even need water cooling on the motor.

[raptor347]

I run that motor in a mono turning a pitched up X450/3. I've run the numbers on that motor on 4S in a rigger. You'll run a minimum of a 1650 and probably go to a 1655 once it's dialed in. Mot a bad rigger motor if you know how to work props. I figured I could get a 75+mph heat race rigger on that motor and still have it be easy on equipment.

[jpracing1997]

Yeah, the guy that built it said it should run 70 with this motor in this rigger. I was wanting to get some more info from you guys. I value your opinions! Thanks

[m4a1usr]

A Neu 1521/1.5D motor on 4S is a little too low Kv for a rigger. Maybe a sport setup for sunny day playing. I run the 1521/1D in a Mr. Krabbs rigger on 4S and its decent but I would not run a 1.5D The prop would end up being huge not to mention you could see amp spikes all over the place during turns. Mine runs a 2150 prop and a CC240LV speedo. Good setup. Clean. Fast. Not a record breaker thats for sure. But you better be paying attention to your driving cause it covers territory fast!

John

[jpracing1997]

1.5d

Should I run it on 6 cells

[Fluid]

No, 6S is too much, stick with 4S. That motor will work fine in your rigger propped correctly. I get 60 mph in my heavy P Sport Hydro with a Prather 230 prop. Like Brian said, with a pitched up 1650 or cut down 1655 it will work fine. Other props to try would be a P747 or 1950 if you don't feel comfortable bending props.

A 1521/1D has near 40,000 rpm on 4S. I set a SAW record with one a few years ago. A 2150 prop? Talk about amp spikes! You sure it isn't a 1527/1D?



.

[jpracing1997]

Its a 1521 1.5d for sure! I'm gonna run it this weekend and see how it goes.

[Fluid]

...You sure it isn't a 1527/1D?........

This question was for John, his example made no sense.



.

[m4a1usr]

A 1521/1D has near 40,000 rpm on 4S. I set a SAW record with one a few years ago. A 2150 prop? Talk about amp spikes! You sure it isn't a 1527/1D?

Nope. I'm sure. Already went over that with MarkF back in 2008. The 1527 didnt have enough RPM's. Couldnt swing a 50mm prop more efficiently even at lower RPM's. Not that a 2150 was the perfect choice. But a V947 couldnt get aggressive with the strut adjustment/ AOA available and a JG 3I22 slipped excessively. Few options left. Never had a over temp with the 2150, not that its a 6 lap setup. But its not a full blown SAW either.

John

[jpracing1997]

ok, update! I ran it today with a 1747 prop and a 447 3 blade. The 1747 prop didnt do too good and the 447 got it to maybe 40 with 4 cells. That sucked pretty bad. Any suggestions???? I have a 1521 1.5d and it was run on 4 cells, in a 36 inch long rigger and 20 inches wide. The guy I got it from said Paul Packmayer or somebody like that built it and said it should run in the 70's. Please help! Motor suggestions or more cells?

[BakedMopar]

I think you should take the advice that was given to you in the above posts concerning props. Those two guys (Brian and Jay) know what's going on.

Not to sound like a smart ass but tuning a setup (props , attitude etc.) is the key to making a boat fast , not just horsepower.

[jpracing1997]

I ran it with a 1747 prop and it was not pretty! Can anyone suggest a 6 cell motor for this setup? I want to run at least 70 mph with this rigger. I dont want a 4 cell setup in my rigger! Any suggestions on a motor?

[raptor347]

ok, update! I ran it today with a 1747 prop and a 447 3 blade. The 1747 prop didnt do too good and the 447 got it to maybe 40 with 4 cells. That sucked pretty bad. Any suggestions???? I have a 1521 1.5d and it was run on 4 cells, in a 36 inch long rigger and 20 inches wide. The guy I got it from said Paul Packmayer or somebody like that built it and said it should run in the 70's. Please help! Motor suggestions or more cells?

That is likely one of the Cajun Bullets that Paul had built for FE. If it is, you essentially have a modified 45 size Cajun Bullet which would run a 55mm+ diameter prop turning in the high 20K range. You're going to want to prop up. It should be a very good boat.

The 1747 probably won't work unless you radically delift it. Even then it's going to be too small and very light on pitch.

What's the boat weigh RTR?

[jpracing1997]

Prop

What props do yall think will be my next step? I will have to order some more! I only have a 230 prather and h10 abc, that are big. The rest are like 642, 445, 442, 937/3 , 940/3, etc....