There's a hole at the center of earth where the rest of the world sinks but i stand still...
Yeah, I always worry about getting that cross threaded and messing up or pulling the thread. I like to thru drill the aluminum and use a 8-32 blind nut with the teeth cut off, epoxied onto the block using the large round head on it. That way if I ever do have thread problems, I can pop out the bad blind nut and use my long needle nose pliers to get another one in there... But the wood framed boats do present access challenges. Is that 6061-T6 material? Really like your build thread, looking good man!
The build is coming along fine. A clear & concise build thread too.
That is a lot of aluminium for the mounting block. I've only ever used 1/4" plate myself. Even in the bigger GP400 & the 1/8 scale hydros. No way will the bolts strip out of the block you have.
Just in relation to the turn fin, I ended up with a UL-1 fin on mine & it worked pretty well too.
Looking forward to the finished boat & the maiden runs.
See the danger. THEN DO IT ANYWAY!!!
https://forums.offshoreelectrics.com/...hp?albumid=319
https://forums.offshoreelectrics.com/...hp?albumid=320
785, that UL-1 fin worked for you, eh? I had that as my first fin on my 34" Hydro and found it was bending right about the apex of the turn. It caused the boat to suddenly understeer. At first I was thinking rudder, but that was fine. I put a side brace on it, it still bent! I didn't bend permanently, just moved like a spring... I had to go with a hardened, 7075 aluminum fin to keep it turning true. But I have a heavy boat...
IMG_4936.jpgIMG_4933.jpgHere you can see my fin mount, which is just a speedmaster universal rudder mount. 4 bolts into a 1/2 thick aluminum block should be good even thru the explosion of our sun lol
And as you can see, the rear predrilled holes are fine, just need to drill a front and I'm good
There's a hole at the center of earth where the rest of the world sinks but i stand still...
Hi Craig.
I would say that this 31" boat is a lot lighter than your 'heavy' 34" boat. Probably why the UL-1 fin worked well on mine.
Here is another fin that works well on sport 20 size boats like this. Designed by "Raydee" here on this forum. I have a couple working well.
cache.jpg
See the danger. THEN DO IT ANYWAY!!!
https://forums.offshoreelectrics.com/...hp?albumid=319
https://forums.offshoreelectrics.com/...hp?albumid=320
See the danger. THEN DO IT ANYWAY!!!
https://forums.offshoreelectrics.com/...hp?albumid=319
https://forums.offshoreelectrics.com/...hp?albumid=320
so, todays attempt at drilling and tapping for the turn fin was an utter failure. i hadn't considered what tapping 1/2 thick aluminum would be like. well, the first attempt the tap broke inside. so i figured ok, ill just move along to another. the second hole wasn't going much better. but instead of making things worse, i just took the heat gun out and heated up the rather fresh epoxy and gently worked the whole block loose and cleaned out all the glue. i will be grabbing a 1/4 block this time and just pre drilling and tapping before glueing in.
also i decided to mount the strut and rudder. the strut went fine, and then i reoriented the rudder to mount on the left side. i should have asked mike first, because after i mounted i asked him and he told me right side. balls. so i put the boat down and called it a day. i really don't need to continue making things worse.
There's a hole at the center of earth where the rest of the world sinks but i stand still...
I have most of my rudders on the left side. Controversial topic, per the norm in this hobby.
Mine all handle great and even the one or two I have on the right run great.
If I were doing this build, I'd leave it on left side and change once I had a chance to run and determine handling.
Mike himself may see how it runs and be impressed. I think there are other variables that are more critical to get right.
"Look good doin' it"
See the fleet
Mine are on the left by design... The boat makes beautiful turns! Don't worry about that, many have success on both sides.
I was concerned about that... aluminum is very grabby to tap. Need to blow, oil and back thread a lot. I was going to recommend a 1/4" block, but I picked up from you that you wanted the thick piece. Good play to pre-tap, you can use one drill size larger to go thru the boat to match up to the block. But matching up those holes isn't real easy which is why I like to thru-drill the block and get a nut glued on the back side. Those blind nuts are damn good dude! I ain't saying no more about that, lol!
IMG_4997.jpgIMG_5003.jpgIMG_4998.jpgI got some 1/4 aluminum, marked the holes then drilled and tapped it before glueing in. I used a small amount of glue when glueing so I didn't get it near the threads, and used the bolts to glue into place to be sure everything lined up proper. That whole part of this build was a bit of a chore for me, but now it's done and I can move on.
There's a hole at the center of earth where the rest of the world sinks but i stand still...
i also need to start thinking about powering this thing.
There's a hole at the center of earth where the rest of the world sinks but i stand still...
Man that's a wicked looking turn fin.
yeah, and i am being rather anal about this part too. i wanted to make sure the mount is seated square to the bottom of the ride pad. i made sure to also drill out any mounting hole just a mm larger than the bolts holding them. a tiny bit can make all the difference when tuning it.
There's a hole at the center of earth where the rest of the world sinks but i stand still...
Yep, you need tweaking room! I found the turn fin to be the most sensitive and productive tuning, even more that the strut. The strut is pretty basic, prop shaft centerline at depth of back of sponsons. I always try to achieve a zero strut angle, that just seems to be a tweak trying to fix another weakness. Sure looks good, enjoy it!
How thick is the material for the turn fin mount?
Nortavlag Bulc
No, I think he's talking about the angle bracket... it looked a little thin to me too...
IMG_5030.jpgIMG_5041.jpg
Last night I got pool noodles in everywhere, then glued the deck on.
sorry for my lack of detail lately. all i did was get out the west systems, coat the area the deck was going on, then coat one side of the deck itself, then used weights, tape and clamps where i could to get it in places.
all set
There's a hole at the center of earth where the rest of the world sinks but i stand still...
Nice looking build! Keep up the good work! Mike
Laser cut, birch plywood rc race boat kits- WWW.MLBOATWORKSRC.COM WWW.DINOGYLIPOS.COM
I have been watching actually! I just dont always post, haha
Laser cut, birch plywood rc race boat kits- WWW.MLBOATWORKSRC.COM WWW.DINOGYLIPOS.COM
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