| Yes this is the allumnium body, rear 4 planetary out of the E4OD tranny. This set up is a 2,17 ratio and i planned to replaced it with a 6 planet, steel planetary, with the 12 lugs.The steel 12 lug set replacement, beds exactly into the machined “lug locks” of the old 4 planetary.What i don’t know if you get a 12 lug plantary to convert to 2.85:1 Must admit that this housings looks good, and the late Lou Ross did a good job with the bellhousing - adapter plate ect.First time to see a redrive in reality, as here is not any examples of it in ZA.At least the housing bolts spot on my 13B and 2 “ears” both sides for the engine frame is easy in the plugs-up setup. This is my first experience with redrives and did not see any of Tracy’s RD C series drives maybe the Ross Aero redrive is a little bit heavy but small penalty to pay for bulletproof housings. At least the ouput propellor shaft is gun-drilled to compensate for weight. It seems also a no brainer to convert the flexplate (old clutch spring center ) with a good rubber dampening set up. It seems possible to cut slots on the side of the bellhousing to reached and inspect the flexplate and proposed rubber dampeners.
The ringgear is pressed fit, and i think the housing is warmed before the ringear was pressed into place. So dissasembling, is not so easy job and i will took it to a engineering shop to took everything apart.
Need your comments and inputs!!
Le Roux
Sent from my iPhone Le Roux Breytenbach On 27 Nov 2020, at 16:29, Charlie England ceengland7@gmail.com <flyrotary@lancaironline.net> wrote:
I was *wishing for* a 2.4-1 set. :-)
I do have a vague memory of a discussion on the 'other' rotary list about a ~2.4- gearset out of a 4 wheel drive truck transfer case. I can't find the posts, but I did find a couple of web links showing the transfer case exploded parts views. It is apparently a Ford NP 271/273 transfer case.
I don't think the discussion ever mentioned whether the planetary set would reverse or maintain input shaft direction. The gears would almost certainly handle a rotary's torque, but I remember that at the time, I wondered about whether the gears and (especially) the needle bearings in the gearset would handle the 6k-8k rpm of the rotary. I couldn't determine from the drawings whether the planetary was downstream of an already-reduced rpm driveshaft.
Maybe you can design one for us. :-)
Charlie Thanks Charlie.
So are there any other ratio’s in the ford sets that can fit our reprove housings?
Steve
> On 27 Nov 2020, at 9:08 am, Charlie England ceengland7@gmail.com <flyrotary@lancaironline.net> wrote:
>
> I'd agree with you; if you limit the rotary to a 'sane' rpm for aviation use (say, 7000), and use a prop that's typically used on smaller 2 place homebuilts with Lycs (meaning 2700 rpm at the prop for 75% power at altitude), then somewhere around 2.6-1 makes sense. On the RVs, even the 180 & 200 HP Lycs use constant speed props that are 74" dia. & turn 2700 rpm.
> https://shop.vansaircraft.com/cgi-bin/shop.cgi?ident=1606438205-166-687&browse=props&product=csprop-hartzell
> Only reason to turn under 2700 in cruise is if you're highly motivated (self or legislated) to keep noise to a minimum.
>
> Another motivator to keep rpms up is that a lot of prop carvers are in uncharted territory when you ask for a 2200 rpm prop. (Right, Sam H. ?) ;-)
>
> When I ran numbers treating the Renesis as a 180 HP engine (~6000 rpm, supposedly the minimum bearing load rpm) and swinging the big 76" dia prop, I was wishing for a 2.4-1 ratio (~2500 prop rpm).
>
> Charlie
>
> On 11/26/2020 5:09 PM, Stephen Izett stephen.izett@gmail.com wrote:
>> Why is that?
>> Tracy made the comment that even the 2.85 which I have is only really useful for props >than 74”
>> Which I understood to be about the tip speed being to low and inefficient with smaller diameter.
>> I dont want to spin my engine more than 7500 rpm.
>>
>> What am I missing?
>>
>> Steve
>>
>>
>>> On 27 Nov 2020, at 7:03 am, Ernest Christley echristley@att.net <flyrotary@lancaironline.net> wrote:
>>>
>>> At 70 inches, you would want to go the other way. The C4 gearset was 3.17, but the problem was the weak planetary gear carrier. But, I just posted a link with a 6 planet carrier.
>>>
>>> On Thursday, November 26, 2020, 5:56:14 PM EST, Stephen Izett stephen.izett@gmail.com <flyrotary@lancaironline.net> wrote:
>>>
>>>
>>> On that note can I ask a gearbox question.
>>> I’ve always understood we only really had the choice of 2.17 and 2.85 :1 gear ratio options if using the Ford planetary gears.
>>>
>>> Looking at our Glasair and I imagine some other aircraft with prop diameters of around 70 inches we would prefer a ration around 2.6:1
>>> giving us I think a better prop rpm and tip speed.
>>>
>>> Are there other options?
>>>
>>> Steve Izett
>>>
>>>
>>>
>>>> On 27 Nov 2020, at 6:32 am, Ernest Christley echristley@att.net <flyrotary@lancaironline.net> wrote:
>>>>
>>>> Is that the 4 planet, C4 gear set? If so, I've been made to understand that there aluminum body gets wallowed out by the planet gear's shaft. I recently found that there is a performance shop selling a replacement unit with six planets. I know nothing about them other than that.
>>>>
>>>> https://speedmaster79.com/Ford-C4-Transmission-Performance-6-Pinion-Planetary-Gear-Set
>>>>
>>>> On Thursday, November 26, 2020, 3:16:01 PM EST, Le Roux Breytenbach breytenbachleroux@gmail.com <flyrotary@lancaironline.net> wrote:
>>>>
>>>>
>>>> Terry : Thanks Terry for the Ross Redrive the parcel arrived on Monday 23 Nov .
>>>> Neil if you want some dimensions on the hollow propellor shaft your welcome.
>>>> Regards
>>>>
>>>>
>>>> Sent from my iPhone
>>>> Le Roux Breytenbach--
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