mjmods.com maxijet mods??

[madmax7774]

I took the plunge not too long and bought some of those maxijet 1200 mods from mjmods.com I consider myself pretty hobby capable, and so far I just can't get seem to get it right with these. Has anyone else in WAMAS tried any of these, and if so, how hard was it to get it dialed in? So far I have been fighting with keeping the prop attached to the shaft. It always comes loose. Superglue is the recommended way according to the reefcentral thread on it. That clearly is not going to work in my case. I'm thinking of trying to drill a small hole and pin the prop to the shaft. What has your experience with these been?

John

:(

[kngfisher]

I took the plunge not too long and bought some of those maxijet 1200 mods from mjmods.com I consider myself pretty hobby capable, and so far I just can't get seem to get it right with these. Has anyone else in WAMAS tried any of these, and if so, how hard was it to get it dialed in? So far I have been fighting with keeping the prop attached to the shaft. It always comes loose. Superglue is the recommended way according to the reefcentral thread on it. That clearly is not going to work in my case. I'm thinking of trying to drill a small hole and pin the prop to the shaft. What has your experience with these been?

John

:(

 

I used superglue on the three I and friends built and have had no problem....you can also use the same glue used when glueing frags to rock....

[flowerseller]

The guy with a cold above made me a mj mod and glued it with SGG.

[madmax7774]

ok,

I finally got it working. Now for the bad news. It's too powerful. When I run it in my tank, it creates a massive whirlpool. darn-it. after all this effort, it's too much. I bought 4 of these too. These things are better suited for a long tank like a 72" tank or better. it's too much for my 48" tank. I'll guess I'll see about using a smaller prop to get the flow under control.

:( :( :( :(

[Relad]

ok,

I finally got it working. Now for the bad news. It's too powerful. When I run it in my tank, it creates a massive whirlpool. darn-it. after all this effort, it's too much. I bought 4 of these too. These things are better suited for a long tank like a 72" tank or better. it's too much for my 48" tank. I'll guess I'll see about using a smaller prop to get the flow under control.

:( :( :( :(

 

DON'T GIVE UP YET......... YOU CAN USE A SMALLER PROP FOR THE MOD AT ANY HOBBY SHOP. IT WILL SPIN FASTER BUT WONT' BLOW EVERYTHING DOWN....

[YBeNormal]

 

DON'T GIVE UP YET......... YOU CAN USE A SMALLER PROP FOR THE MOD AT ANY HOBBY SHOP. IT WILL SPIN FASTER BUT WONT' BLOW EVERYTHING DOWN....

 

What hobby shops? I haven't found any in the Manassas area that carries props.

[madmax7774]

There is a great hobby store in chantilly off of 28 called hobby hangar. I am going there this weekend, and will scout out the prop selection that they have. If they don't have what I am looking for, I will put together an order from Tower hobbies.

John

 

Hobby Hanger

14014D Sullyfield Circle

Chantilly, VA 20151-1689

(703)631-8820

Edited January 6, 2007 by madmax7774

[dzekunoi]

What hobby shops? I haven't found any in the Manassas area that carries props.

Strange. Any hobby shop that has RC airplanes has props as well usually.

[YBeNormal]

Strange. Any hobby shop that has RC airplanes has props as well usually.

 

Yeah, but these are smaller props used for boats and the like. I've checked the three hobby stores in Manassas and called others in the general area and none of them carried these props. Sounds like the one in Chantilly might be the ticket though.

[Norboo]

I checked the one in Manassas but they only had one. I told them there would be many people looking for it and they should stock up. Best to my knowledge, they never did.

 

I

[kngfisher]

it's too much for my 48" tank.

 

no, i disagree. I have one, wish I had another, on my 48" long 90gal. they work great. the key is placement. move it down in the tank alittle and the whirlpool will stop....and yes, I got the largest prop on mjmods for my mj1200

 

I have mine 6" below water line

[Jager]

also if your mounting it to the side of the tank, itll be too much flow usually, moving the MJ to the middle of the side of the tank usually keeps it from blasting any one area too much on the other side.

 

if it is too powerful for your applications, try bouncing the flow off the back glass or from behind liverock etc etc , alot of things you can do to slow flow down,

[YBeNormal]

I also had a completed high flow MJ 1200 mod that was pushing way too much water for my little 75g tank (great for the 32g SW mixing container though!). After reading this thread and since I have a few extra Dumas props available in case this didn't work out, I decided to try an experiment.

 

I placed the completed impeller assembly into a drill (minus the end cap of course), clamped lightly onto the metal rod and using some masking tape to prevent the impeller from spinning on the shaft. I then ran the drill at medium speed while I held a cupped piece of 150 grit sandpaper lightly against the outside edge of the prop. Within a few seconds, the prop was reduced from the original 45mm to ~37mm. I then cleaned the edge of the prop by hand using 220 grit sandpaper and reassembled the pump. It now pushes just enough water for my tank and actually seems to run quieter as well.

 

This is a very simple mod and I'm sure the prop could be reduced more or less to suit whatever flow you need. Just make sure that you do not tighten the chuck on the drill too hard and scratch the rod.

[madmax7774]

After my morning coffee, I am going to try your sandpaper idea. let you know how it goes....

[madmax7774]

well, I sanded down the prop, and wouldn't you know it, the prop came loose from the shaft, again... This superglue I am using has got to be bad or something..... didn't they used to run commercials about how superglue could hold a man glued to a steel beam by his head or something like that?

[YBeNormal]

Even superglue doesn't stick to nylon props very well. Did you cut small grooves where the rod goes through the shaft? If not, do that, coat the shaft with super glue, insert the shaft into the prop and apply more super glue around both the top and bottom of the prop and allow this to dry at least overnight before placing it in water.

[madmax7774]

yeah, tried all of that, and I am tired of fooling with this thing. I am going to keep one, and the other 3 are going in the 4 sale forum.

John

[YBeNormal]

What type of super glue are you using?

[madmax7774]

I had the cheap "super glue" brand glue from Lowe's. it was nothing but a problem. I wnt to hobby hanger in Chantilly and got some of the really good "CA" glue that I used to use when I used to build my RC airplanes. That stuff bonds in about 10 seconds. Sanding down the prop was the ticket for my tank. I also sanded mine down to 37mm and it dropped the flow down to an acceptable level. Thanks to Ybenormal for the sanding tip.

John

[YBeNormal]

No problem John. Glad the tip worked for you.

 

I used the super glue gel from Lowes or Home Depot in the small blue tubes and it is holding very well. In fact, I had to cut a prop away from a previously glued assembly and found it to be very difficult to remove. I let it dry at least overnight before exposing it to water though.

[Guest morgan]

I know one thing you cna do is cover up some of the holes in the shroud. If you limit the intake of water it will create less current. Just go and start wrapping black electrical tape around the slits in the shroud and see how it does.

[YBeNormal]

I thought about that but decided against it for several reasons:

 

(1) Who knows what chemicals will leech into the tank from the tape and the glue on the tape

(2) Restricting the flow would needlessly increase power consumption. Reducing the size of the prop reduces resistance and should reduce power drawn.

(3) Not sure how well tape will hold under SW for an extended period of time.