project 2013: #124 - the very last HPR 233

[graill]

I never get tired of hearing them spin up. Folks freak out when they start and realize what they are. Coolness factor is waaaaay up there.

[ManuelW]

will update this thread to the level on the german board within the next days.

For today a few pictures of the turbines within the hull:










regards,
Manuel

[Chrisg81983]

Looks great Manuel turbines are just awesome in every aspect.

[borgie]

maybe on your next build u could use these? http://shop.rcboatbitz.com.au/index....oducts_id=1057

[ManuelW]

@ borgie: A couple of LMT 3080's or NEU 2230's should do the job. That TP is a nice monster but no suitable ESC around to use it.

Also some progress on my big boat. As I already mentioned I could borrow a set of turbines from someone else to take the dimensions and try a few things. As exchange for that I told him, I'll make some nice carbon fibre turbine mounts for him. That way I could also already get some experience for my own ones.

So here the results of that first try, so far I built three of these. One set to be used in another HPR 233 Twin Turbine built by the owner of the turbines. As already Christian did, the mounts do also have the bearing support for the coupler as well as a mounting bracket for the stuffing tube (flexible one in that case). But he had a built-together system whereas this has one big baseplate. That saves weight and increases stiffness.
The 3rd system is a little conservative and simply identical to the stock JetCat system beside the fact that it is carbon fibre and not aluminium.

The baseplates are CAD designed and CNC machined, the brackets on the side were machined and drilled by hand as I couldn't machine these on the CNC machine.
For assembly I used UHU Endfest 300, its an epoxy based 2K glue with high strength and temperature resistant. I glued and screwed the parts together and put them for 15min in the oven at 150°C (should be 300°F Fahrenheit). Due to that the seams were not 100% perfect as the ones from Christian as you have no influence on these when they are in the oven. But I don't mind as on the other hand I get higher strength and stiffness which is more important for me.

I didn't measure it, just from having it in my hands I'd even say they are stiffer than the stock JetCat system but have dramatically less weight:
-JetCat stock: 505g
-JetCat copy carbon-fibre for CT10 Hydroplane: 284g (-44% !!)
-Mount system HPR 233: 326g

And I didn't even had an eye on keeping it lightweight. For my own systems I'll try to keep weight below 200g per unit which saves a lot of weight. On the photo the bearing supports are still missing as they were out for anodizing. Will post a photo of a complete system soon.

regards,
Manuel

Some pictures:

[ManuelW]

Servo

Also the servo for the monster already arrived, ordered via my local hobbyshop. Before I ordered I took some time for research purpose as I wanted to use something in standard size with 7.4V high voltage. Already use a few high quality servos and I think a big quaterscale servo is not necessary any more. After some research only two servos were left for the choice, the Savöx SB-2270MG or the Hitec HS-7950TH.
I then decided for the Savöx, first I run all the boats I built for the last 3 yeards only with Savöx servo and didn't have a single failure (with all boats probably a few hundred runs!) and second it was a little less expensive. It also features a real brushless motor and a hardened gear.

some infos and specs:
dimensions: 40,3 x 20,0 x 38,5mm
speed 60° bei 7.4V: 0,12s
torque at 7.4V: 320Ncm

Did make some dry tests with the servo, simply unbelievable. Compared it to a common Hitec HS-5745MG with 180Ncm torque (will be used in a MHZ Mystic 185), its way less powerful and stable. Will also use a direct power connection between servo and battery as I'm not sure if the receiver is capable of these currents. The servohorn shown on the pictures is from Robitronic.

regards,
Manuel

pics:

[Chrisg81983]

Thats a powerful servo man. Like servo horn as well.

[lavigna]

Looking real nice Manuel! Keep it coming.

[ManuelW]

today some "bling-bling":

props

Attached some neat props I got from Andy Brown and from Chris Hoffman (dasboata) suitable for the big HPR. Should be the complete range I'd need for that boat. At the moment its four different pairs which should cover all circumstances. I have to admit I do really love the prop-work done by Andy Brown, probably the best I've ever seen

Upper left: PropShop 6518/3 SS by dasboata, cut 62.5mm
Upper right: Octura X460 Andy Brown, cut 60mm, TC (=identical to the ones from Christians boat)
Lower left: Octura X470 Andy Brown, cut 64mm, TC, cupped
lower right: Octura X665 Andy Brown, cut 60mm, TC, cupped, 1/4" aufgebohrt

I'll probably have the X665's heat treated, the blades are done awesome and very symmetrical but really thin.

regards,
Manuel

pics:

[Chrisg81983]

Wow nice collection u got there they look great

[srislash]

Those are some nice works there Manuel. Some great testing to come,eh.

[ManuelW]

Today I'm presenting something which is not intended for my HPR 233 but for a HPR 233 from someone else. He has seen some work from me and Christian as well as Hanspeters HPR 233 and loved some of the work especially the gearboxes. Therefore he sent me his set of HPR 233 drives for some "upgrades".
Sadly due to some circumstances this took way too long but there the result:











I'm sorry for the delay, hopefully the result is at least a little worth the waiting.

regards,
Manuel

[lavigna]

I love those drives! Brilliant

[ManuelW]

First a nice picture of me and this project:


HPR "229"

In the meantime I started working on the hull. First I cut away those boxes for the exhausts, was done in 10-15 minutes. First I used a solid carbide cutter to roughly cut them out with a multitool, afterwards I grinded them to the final shape.
At the moment they are right at the original shape and grinded even from inside. For such work the size of the hull is definitely an advantage, you can almost sit in it and work easily from inside or take photos.







And this is how at the moment it looks from inside. I think I will grind both openings about another 1/4" bigger in size. The white border you can see is just GelCoat and white thickened resin without weave. I'll remove that as well before I finally close these.

[Chrisg81983]

Nice mam