.12 rigger NEED HELP !!!!!

[Ralphie]

Well I am new to nitro riggers but do have experience with Nitro Tunnel Hull and other RC boats, but this thing has got me PULLING MY HAIR OUT !!

What I have is a .12 FireFighter rigger with a Dynamite .12 SPD (air cooled) motor. My problem is I can't get it up on the sponsons. Today I FINALLY got it to make a few SLOW laps, with the throttle wide open. I started to lean it out slightly but had other troubles (2 glow plug batteries went dead and I had about had it for one day). This is the BEST the boat has done, usually would go out 20-30' and bog down like I through an anchor out.

Prop I am using is a modified p215 (P215 recommended for this boat by the designer Tom) also tried a x440 but not much help.

I am running 30% O'Donnell BOAT fuel, but it is a car motor does that matter ??

Prop center line is even with the bottom end of the rear tips of the rear sponsons, the boat does sit low in the water in the back if you just let it sit in the water. Is that normal ?? Or do I need to raise the prop, it is 1/4" below the transom.

Front sponsons are set to the FF plans I'm sure they will need some adjusting but look good by what I can see. Just can't seem to get it up on the front sponsons and the prop blade.

ANY suggestions from you experienced "rigger runners" would be great help and appreciated.

THANKS

 

[Jay Martin Jr]

Well I am new to nitro riggers but do have experience with Nitro Tunnel Hull and other RC boats, but this thing has got me PULLING MY HAIR OUT !!What I have is a .12 FireFighter rigger with a Dynamite .12 SPD (air cooled) motor. My problem is I can't get it up on the sponsons. Today I FINALLY got it to make a few SLOW laps, with the throttle wide open. I started to lean it out slightly but had other troubles (2 glow plug batteries went dead and I had about had it for one day). This is the BEST the boat has done, usually would go out 20-30' and bog down like I through an anchor out.

Prop I am using is a modified p215 (P215 recommended for this boat by the designer Tom) also tried a x440 but not much help.

I am running 30% O'Donnell BOAT fuel, but it is a car motor does that matter ??

Prop center line is even with the bottom end of the rear tips of the rear sponsons, the boat does sit low in the water in the back if you just let it sit in the water. Is that normal ?? Or do I need to raise the prop, it is 1/4" below the transom.

Front sponsons are set to the FF plans I'm sure they will need some adjusting but look good by what I can see. Just can't seem to get it up on the front sponsons and the prop blade.

ANY suggestions from you experienced "rigger runners" would be great help and appreciated.

THANKS

Ralphie,

if you can upload some digital pictures of the rear end maybe we can spot whats wrong.

JJ

 

[Ralphie]

Well I am new to nitro riggers but do have experience with Nitro Tunnel Hull and other RC boats, but this thing has got me PULLING MY HAIR OUT !!What I have is a .12 FireFighter rigger with a Dynamite .12 SPD (air cooled) motor. My problem is I can't get it up on the sponsons. Today I FINALLY got it to make a few SLOW laps, with the throttle wide open. I started to lean it out slightly but had other troubles (2 glow plug batteries went dead and I had about had it for one day). This is the BEST the boat has done, usually would go out 20-30' and bog down like I through an anchor out.

Prop I am using is a modified p215 (P215 recommended for this boat by the designer Tom) also tried a x440 but not much help.

I am running 30% O'Donnell BOAT fuel, but it is a car motor does that matter ??

Prop center line is even with the bottom end of the rear tips of the rear sponsons, the boat does sit low in the water in the back if you just let it sit in the water. Is that normal ?? Or do I need to raise the prop, it is 1/4" below the transom.

Front sponsons are set to the FF plans I'm sure they will need some adjusting but look good by what I can see. Just can't seem to get it up on the front sponsons and the prop blade.

ANY suggestions from you experienced "rigger runners" would be great help and appreciated.

THANKS

Ralphie,

if you can upload some digital pictures of the rear end maybe we can spot whats wrong.

JJ

Maybe this will help ??

THANKS

 

[Jay Martin Jr]

Well I am new to nitro riggers but do have experience with Nitro Tunnel Hull and other RC boats, but this thing has got me PULLING MY HAIR OUT !!What I have is a .12 FireFighter rigger with a Dynamite .12 SPD (air cooled) motor. My problem is I can't get it up on the sponsons. Today I FINALLY got it to make a few SLOW laps, with the throttle wide open. I started to lean it out slightly but had other troubles (2 glow plug batteries went dead and I had about had it for one day). This is the BEST the boat has done, usually would go out 20-30' and bog down like I through an anchor out.

Prop I am using is a modified p215 (P215 recommended for this boat by the designer Tom) also tried a x440 but not much help.

I am running 30% O'Donnell BOAT fuel, but it is a car motor does that matter ??

Prop center line is even with the bottom end of the rear tips of the rear sponsons, the boat does sit low in the water in the back if you just let it sit in the water. Is that normal ?? Or do I need to raise the prop, it is 1/4" below the transom.

Front sponsons are set to the FF plans I'm sure they will need some adjusting but look good by what I can see. Just can't seem to get it up on the front sponsons and the prop blade.

ANY suggestions from you experienced "rigger runners" would be great help and appreciated.

THANKS

Ralphie,

if you can upload some digital pictures of the rear end maybe we can spot whats wrong.

JJ

Maybe this will help ??

THANKS

It looks like you have too long of a rudder, you may want to shorten the rubber. Also make sure there are no blunt spots on the rudder that will cause drag. I usually figure no more than 1.5" below the bottom of the prop for a rudder length ( sometimes I even go shorter), put the prop on the shaft and turn the blade untill it points down then measure from the bottom tip of the blade to the bottom of the rudder. Too much drag and the boat won't go anywhere.

JJ

 

[Jay Martin Jr]

Also check out my photo gallery of my .12 hydro https://www.intlwaters.com/gallery/thumbnails.php?album=607

 

[Ralphie]

Also check out my photo gallery of my .12 hydro https://www.intlwaters.com/gallery/thumbnails.php?album=607

My bottom prop tip is 1.25 above the bottom of the rudder, the picture may be deciving. My rudder can use a good shapening it is kind of fat.

Your rigger looks real good, did you have a hard time setting it up ??

How deep are you running the center line of the prop, mine is at the bottom edge of my sponsons, but the boat sits low in the water when not running.

THANKS

 

[Jay Martin Jr]

Also check out my photo gallery of my .12 hydro https://www.intlwaters.com/gallery/thumbnails.php?album=607

My bottom prop tip is 1.25 above the bottom of the rudder, the picture may be deciving. My rudder can use a good shapening it is kind of fat.

Your rigger looks real good, did you have a hard time setting it up ??

How deep are you running the center line of the prop, mine is at the bottom edge of my sponsons, but the boat sits low in the water when not running.

THANKS

Try to cut a 1/4" off you rudder, when I mean blunt I am talking about when the blade gets to the top it goes from sharp to a flat spot near the pin that holds the blade onto the bracket. If that blunt spot is contacting the water it will cause drag. On the measurements I will have to check since im at work right now. The prop I first ran the boat with was an X438, make sure you have about a 2 degree angle down on your strut, too level and the rear end will sit too low in the water.

 

[Ralphie]

Yes my rudder is Blunt at the top, good point, I will fix that and maybe take .25 off bottom and check the angle I maybe only 1 degree.

I don't know if these little changes will help my BIG problem but I'm will to try anything. I know if I can get it to lift the tub out of the water it will fly.

Do you have water drain holes on your engine and front fuel tank area ? I do they fill up real fast as I can't get the tub up.

Thanks

 

[Jay Martin Jr]

Yes my rudder is Blunt at the top, good point, I will fix that and maybe take .25 off bottom and check the angle I maybe only 1 degree.I don't know if these little changes will help my BIG problem but I'm will to try anything. I know if I can get it to lift the tub out of the water it will fly.

Do you have water drain holes on your engine and front fuel tank area ? I do they fill up real fast as I can't get the tub up.

Thanks

No drain holes in my 12 boat but my 45, 90, and twin all have drain holes. Could be the needle is just set too lean. The bottom of my strut is no deeper than the rear sponsons, mine is real easy to set up and run. Ran it last week at the pond with no problem even though it was a little too windy for the little boat. What percentage nitro are you running? Have mine set up on 45% right now.

 

[Ralphie]

No drain holes in my 12 boat but my 45, 90, and twin all have drain holes. Could be the needle is just set too lean. The bottom of my strut is no deeper than the rear sponsons, mine is real easy to set up and run. Ran it last week at the pond with no problem even though it was a little too windy for the little boat. What percentage nitro are you running? Have mine set up on 45% right now.

Maybe I would be better off pluging the drain holes as the water gets in right away and must be adding weight to the boat. My strut is no deeper the the sponsons too. Using O'Donnel 30% BOAT fuel.

 

[dannyual767]

Ralphie, I don't mean to insult your intelligence but are you giving your boat a toss when you launch it? Most riggers won't get up on plane, ever, if they aren't slung forward with the throttle reved up.

 

[Ralphie]

Ralphie, I don't mean to insult your intelligence but are you giving your boat a toss when you launch it? Most riggers won't get up on plane, ever, if they aren't slung forward with the throttle reved up.

No problem any question is OK with me. YES I am doing exactly that.

Thanks

 

[Watercadet]

Give it more fuel. I had a hell of a time with my FF.12 and a Sirio car motor. I was tuning it on the beach like a car motor, the thing is when the prop gets loaded from the water it leans out the motor even more. So a proper mixture on the beach went lean when the boat hit the water. It would take off from the beach in a blaze of glory then fall off plane and die no matter what I did. I fattened it up about a turn, found an air leak that was not helping at all, and it was off to the races. Give it some more gas!!

 

[anthony_marquart]

IS the motor new? I had the same thing and found a bent rod. The motor should be blubbery rich on the shore... hardly idle without blipping the throttle... The .12s are touchy sometimes.. That engine, from what I know, is not a high output engine. Could be wrong there but I would try less prop. Once you get it setup and trimmed then you can try more prop..

 

[Ralphie]

Give it more fuel. I had a hell of a time with my FF.12 and a Sirio car motor. I was tuning it on the beach like a car motor, the thing is when the prop gets loaded from the water it leans out the motor even more. So a proper mixture on the beach went lean when the boat hit the water. It would take off from the beach in a blaze of glory then fall off plane and die no matter what I did. I fattened it up about a turn, found an air leak that was not helping at all, and it was off to the races. Give it some more gas!!

That makes sence, I will try it.

Thanks

 

[Ralphie]

IS the motor new? I had the same thing and found a bent rod. The motor should be blubbery rich on the shore... hardly idle without blipping the throttle... The .12s are touchy sometimes.. That engine, from what I know, is not a high output engine. Could be wrong there but I would try less prop. Once you get it setup and trimmed then you can try more prop..

Yes new motor.

YES I had someone else also say Smaller Prop, should be worth a try. Will try richening it first that would be an easy try.

THANKS

 

[topfuel443]

Any time im trying to get a new boat going, whether its a rigger, tunnel or whatever... ALWAYS start with a small prop. The smallest prop you have will atleast let you get the motor somewhat tuned and you should be able to see if the hull is handling "ok". ESPECIALLY if this is a new motor. A 215 is quite a large prop for that small of a motor, it may turn it eventually, but not in the begining. Once you get the motor broken in, needle close, and boat set-up properly, THEN try the 215.

Do you have a X438 or somethin along those lines? maybe even smaller?

Riggers in general can make you pull your hair out, not to mention the mini ones....

~James

 

[tnrcboatracer]

Take a 1 1/2'" long piece of radio box tape, and fold 1/2" of it back on itsef (adhesive to adhesive). This leaves 1/2" of adhesive exposed. Degrease the bottom of the hull and apply the tape to the bottom of the hull about 1/16" in front of the hole. The tape will seal the hole by the water pressure when stopped, but will let the water out when running. The tape is like a flap valve.

 

[Ralphie]

Any time im trying to get a new boat going, whether its a rigger, tunnel or whatever... ALWAYS start with a small prop. The smallest prop you have will atleast let you get the motor somewhat tuned and you should be able to see if the hull is handling "ok". ESPECIALLY if this is a new motor. A 215 is quite a large prop for that small of a motor, it may turn it eventually, but not in the begining. Once you get the motor broken in, needle close, and boat set-up properly, THEN try the 215.
Do you have a X438 or somethin along those lines? maybe even smaller?

Riggers in general can make you pull your hair out, not to mention the mini ones....

~James

That is EXACTLY what I have in the works, I have a smaller shaft coming and have some small props to try X432, y535, X632 and a couple of others. Think you guys have hit the nail on the head a bunch of people said the same thing (smaller prop) , I also picked up a new OS .12 CV-R motor I believe it will be a lot better they the Dynimite motor I now have, But will try the Dynimite until it give out.

THANKS

 

[Ralphie]

Take a 1 1/2'" long piece of radio box tape, and fold 1/2" of it back on itsef (adhesive to adhesive). This leaves 1/2" of adhesive exposed. Degrease the bottom of the hull and apply the tape to the bottom of the hull about 1/16" in front of the hole. The tape will seal the hole by the water pressure when stopped, but will let the water out when running. The tape is like a flap valve.

That is a GREAT idea but I don't think it will work on my rigger as my holes are on the side at the bottom.

Not on the bottom of the hull.

Thanks