Turn fins through the hull

[G-UNIT]

Has anyone tried or thought of installing turn fins through hull about an inch foward of the transom? I've been thinking of this the last few days because I'm
getting ready to over haul the BJ with new paint and in hull water cooling ect and I thought this would be different, I can't see where it would create any more drag then the stock ones and they would be even shorter, what do you guys think?

[CatMan]

I have wondered about this as well, and thought it would be cool to connect them to a servo somehow, where I could drop it down when turning but bring them back up in the straights. have no idea how I would do it and dont know if anyone else has ever tried it, but I'd like to see it!
How are you going to do the in hull water cooling?

[G-UNIT]

Look under tech tips on this forum.
I'd like to do both but I think putting through the hull fins and water cooling near each other
might create air bubbles and and lower the performance or intake of the water pick up,
do you follow my thinking?
but it would be cool.
Your idea sound cool also but how would you keep the water out with servo activated turn fins in the hull. needs a pretty tight seal that would still let the fins raise and lower.
It wound also be cool to make a gear adjustable strut so you don't have to loosen, adjust, and then tighten the bolt to adjust you strut height, just turn a knob and be done with it.
Sometime I think I just think to much, but thats what FE boats is all a bout, right

look under tips and info / how to water cool electric boats

[CatMan]

I was thinking about making a box inside the hull ( 1 for each turn fin)so when the fins are up they would be inside the box, not sure how as far as servo rod would work but thought I could boot the rod where it goes into the box. I feel real funny talking about this as I have never had a boat and have no idea how to make it work. was hoping to figure it out once I actually have some experience with these things. Have had recreational kayaks that have a drop down skeg and this is where i got the boxed in the hull idea so it would still be watertight. and like you I think too much and have also wondered about something similar for the strut, where I could adjust it "on the fly" from the radio. I will be using a 4channel Traxxas Summit radio so I could use the high/low tranny switch for up/down turn fins. and still have a 3 position switch open for a possible 3 position strut adjustment. and as far as air bubbles i was thinking that a piece of flat rubber or plastic recessed above the bottom of the hull in the "box" with a slit just big enough for the fin to come thru would help keep some water out of box enough to make it not ride funny or create air bubbles, but once again I know nothing about it yet, am I an idiot savant or just an idiot? (Im voting on idiot) afterall "catman" is short for cata-moron man. or to make it simpler maybe leave the fins on the back where they are now, but make them adjustable with a servo and boots for the servo rod. I still have just a bare hull and am waiting on a topsecretboats rudder from ebay, but dont know if its too long or not but it has two water pickups, and figured I could shorten it if I need to once I get the boat running. which hopefully I will be able to get the rest of the parts real soon so I can get it up and running. still not sure which motor to get or ESC

[G-UNIT]

Well what can I say, if a person did'ent have any ideas, where would we be today?
so anyway my boat is striped down to the bare hull and I mean striped of everything except
the floatation so I'm going to try a few things. I even ripped out the thin ply at the transom and replaceing it with new. so I have a completely new back end with no holes, I'm even going to cu up small bits of fiberglass cloth and mix it with resin and fill in the holes before I resin over the holes for more strength.
will be adding a layer of cloth to the hull bottom also, this area seems a bit weak.
also I'm going to make a new stuffing tube support ( smaller one ).
I just want to make this boat neat and clean before it gets new paint, so as you can see I got my hands full for awhile.
later.

[CatMan]

Wow your boat is about to look worse than mine!, but at least you have all the parts to put back in it. Are you going to glass in the last step on the hull? are your in hull water pick ups store bought or homemade? so you will have it apart for an hour or two, then all back together again right :)
Since you will have a bare hull, I say go ahead and put in the retractable turn fins and adjustable strut !! it will save me alot of frustration when I do it ( and take lots of pictures) it makes it easier for me to copy Ha Ha he he. and if you run into a problem just let me know, I've stared at this bare hull more than anyone and can tell you the lengths,depth and color. beyond that I'd have to refer you to someone on here with actual knowledge. But I can show you how to tie a string to the front and pull it around the pond, making the motor boat noises is completely optional
Good Luck cant wait to see pictures, and who knows this might just motivate me to put my rudder on (my first & only part so far)

[G-UNIT]

Yes I am going to fill in the last step and my p/u are home made followint the tips and info sectoin.as far as retractable fins thats alittle advanced for me right now and an adjustable strut will take time also im not a machinest to make a gear drive set up for the strut, but I will put in the solid mounted turn fins as long as it does'ent interfere with the water intake.
I will post pics as I go along, no this is not a two hour job I wish it was and would be if I was
retired. but you know how that goes.

[CatMan]

I was being sarcastic about the time, It would take me more than two hours just staring at it trying to figure out how to do it! probably take more time than that just to strip it down and get it ready, and why do I always end up with extra parts when it goes back together? I bet if I did it I would be happy if it was back together in two to three weeks! Cant wait to see pics of the Mod's.

[G-UNIT]

I know you were, yea working two jobs it's going to take alittle time, alittle bit here and a little bit there, alittle drink here and alot of drink there, think about this think about that ect. ect..
thats whats so enjoyable about it. just need to get some pics as I go along.

[WrknItUp]

Okay you guys got the turn fins down it looks like. That would be sweet, have retractable turn fins for diff water conditions. HOW ABOUT Electronic trim tabs OR a way to re pitch the prop on the fly? Like BIG boats with electric trim lol go figure. Not much thought behind id besides i think you could use a second or 3rd servo pending on your setup run a push rod and a rubber boot through the hull to the transom or turn fins with a slight bend in the push rods could allow a quarter to half inch of adjustment on the fly at the turn or press of a button. Imagine being able to adjust the nose while its screaming across the lake. I wonder what kind of speed difference this would allow people to achieve? JUST A THOUGHT!

[G-UNIT]

I diffenitly think this is possible, it just takes some thought and a little know how, just wait and see, soon you will see someone went and did it using our idea and you'll see it here first,
you just never know.
I'll have in the hull turn fins in soon and will put some pics in here.
I know it will look cool, I just hope I get good results from it, can't hurt trying right

[screwball]

i put fins like you described in your first post on my micro scat cat and it berformed terribly it was almost like the boat would lean and they would hold it in that lean, im not saying dont do it but on my hull it didnt work out

[G-UNIT]

Maybe the scat cat just was'ent big or heavy enough, but I'll try it anyway, easy fix if it does'ent work.
thanks for your input.