Turbo Trans?

[Brushless55]

Anyone with info of where I could find some kind of Trans that I could use with a CC1717 motor, also pricing on one...
I'm thinking of trying one out in a Rio 51z
If I could gear down maybe 30-35% on 5s, one CC1717 motor could push this hull to mid 40's
or maybe 40% on 6s?

[m4a1usr]

I dont think a FDM turbo trans could stand the power of a 1717. One of the gears is aluminum but the other on all of the ones I have owned has been delrin/nylon. The Hughey gear box does have metal gears but I dont think its capable of mounting a 50mm dia can to it. Its just a smaller gear box so it becomes a clearance issue. Dont know about the car/buggy world. Maybe someone knows of a land based gear box that could work?

John

[m4a1usr]

Here's a pic of a KB45 mounted in one for an idea of size.

John

[Brushless55]

so you think one of the gears could strip out?

[Fluid]

The Hughey gear boxes always came with plastic gears, but I never broke a gear with one or two 05 motors on the five different transmissions I raced. Neither did Ed when we raced together. But it is too small for the 1717 motor to even fit.

The FDM Turbo Trans would hold the 1717 motors, and when set with the correct lash and lube they are good for mid-70 SAW records on 24 and 32 NiMH cells; been there done that. A club member still races one in his 10S mono with a 2280 Lehner and a 55mm prop - no broken gears after two years of racing.

You have to understand transmissions and gearing to get any advantage from them. A lot of folks on OSE tried them but because they failed to understand how transmissions work they "thought" the gear reduction offered no advantage......


.

[Brushless55]

so it sounds like the turbo trans could work for me?

[m4a1usr]

I would bet the synthetic gear couldnt hold up to the HP demand. Just my opinion, but you know the 1717 is a power house. After looking at the picture closely I posted I can see a problem with the rear bearing plate too. I dont think there is enough clearance as the motor will hang over the rear plate holding the bearing in alignment with the front plate. I think the diameter of the rear bearing is too big with a motor having a 50mm dia. Maybe someone who has one in hand can assist with this? I havent had a FDM trans for a couple years now so its all from memory and pics.

John

[m4a1usr]

Looks like Jay posted right before I did. I would trust his judgement more then mine. Like I said its been awhile for me since I have owned one. Here is a side pic of a 36mm can mounted in a Turbo trans.

John

[Brushless55]

now I'm kinda kicken myself for not buying one when I picked up my T29 in the swap shop..

[Brushless55]

The Hughey gear boxes always came with plastic gears, but I never broke a gear with one or two 05 motors on the five different transmissions I raced. Neither did Ed when we raced together. But it is too small for the 1717 motor to even fit.

The FDM Turbo Trans would hold the 1717 motors, and when set with the correct lash and lube they are good for mid-70 SAW records on 24 and 32 NiMH cells; been there done that. A club member still races one in his 10S mono with a 2280 Lehner and a 55mm prop - no broken gears after two years of racing.

You have to understand transmissions and gearing to get any advantage from them. A lot of folks on OSE tried them but because they failed to understand how transmissions work they "thought" the gear reduction offered no advantage......


.

educate me brother

[Fluid]

This is too big a topic to cover adequately in a post, but I'll start. Briefly, a gear drive has little value without a high rpm/high efficiency motor. You trade high rpm power for torque multiplication through the gear reduction. You have to match the output rpm to the prop the boat likes using gear ratios and/or motor Kv. Many folks just use their same direct drive motor in a gear reduction and get lower speeds - which is of course exactly what should happen. They are missing the whole point of the transmission.

Examples: my old Titan 40 ran a TurboTrans with about a 1.3:1 ratio and a 1512/2600 Kv motor on 4S. Direct drive this motor would not have worked at all and I would have burned things up trying for 50 mph. But with the gear reduction I got over 50 mph with low temperatures and moderate amp draw. My new Titan 40 runs a 1521 motor direct drive for less than 2 more mph drawing the same amps. The reason we don't use gear boxes much anymore is because we can now choose a larger motor for larger hulls.

A club member races a Titan 29 with a UL-1 motor in a TurboTrans. Years ago he raced the boat on 18 NiMH cells with a Lehner 2250, but now on 4S spec power the boat is almost as fast. It is faster than any direct drive LSO mono I've seen. He was able to match the high Kv/low torque motor with a prop large enough to efficiently drive the Titan.


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[Brushless55]

Fluid, that's the very reason would like to try this and think it could work

[Flying Scotsman]

A very interesting thread, I have used transmissions on scale boats 48"and above to achieve the ability and efficiency to run large props with small motors. Today, I would go direct drive with the motors that are available now for FE boats.

Douggie