Propeller Blade Type 5101

The fog is clearing, the Type Certificate is very useful.

The max rated continuous HP of a 6167 on a 3D40 / 3DX is 825hp, and 909hp for take-off according to the FAA TDS. http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/7b0e7371b1979abf8525670f00671430/$FILE/ATTKC5QH/Hamilton-3d.pdf

The 6101 is 850 / 1,000 which puts you even more centrally in the ballpark. Don’t be distracted by hub designations, of course – the blade at the hub end is described by the shank size only (D), in that it affects the profile at the root.

In reality you could use a 6101 blade profile, trimmed by six inches.

If we discount the 6167 as its max continuous is less than the max rated output of the A74 then nothing fits exactly on the Hamilton side. Unless they did what DH did in some cases – took a ‘cropped’ HS blade and called it a new base design – in which case to create an ‘authentic’ blade rather than one that works (6101-6) we are in the land of looking at photos and comparing unless the Fiat documentation describing just what they did back there can be found.

The Fiat A74 engine was produced with two different sizes of propeller shaft, Type 42 and 51, the A80 with a Type 52 shaft. The A74R1C38S fitted to the CR-42 ran a 20 degree DT3D42-3 propeller. The BR 20 aircraft fitted with an A80RC41S ran a prop from the same series a 20 degree DT3E52-9.
I have three different parts manuals which are extremely detailed with the exception of the blades.
The A74 delivers approx. 840hp, the 6167A and the 6101 appear to have Design Approval to be fitted to engines of half that HP, even with the addition of a third blade on a 3D40 it is fitted to engines with power output of less than 800HP. The 6101 paddle blade would be preferable to the 6167 toothpick.
Thanks for your input. Out there somewhere there must be detail on the 5101!

Another possibility – the Fiat numbering convention isn’t the same as Hamilton Standard’s, and the ‘-30’ doesn’t mean 30 in/cm reduction at all.

In which case a 9′ 6″ prop, if Hamilton-based would almost certainly be modelled on the standard and fairly common 9′ 6″ 3D40 – type blade family 6181, 6381, 6095, 6167 and 6237- figures below:

[ATTACH=CONFIG]260029[/ATTACH]

Can you confirm the prop diameter? Hamilton didn’t make any 10′ 6″ D-shank prop assemblies. Neither did they make 12′ ones, which it would be if the ‘-30’ was in inches.

However, I got the 9′ 6″ from Wikipedia. 9′ 9″, for example, would give us some very good candidates, such as the 6127.

..so I reckon the 5010 was the Fiat choice for Merlin applications and was modelled on the HS 6xxx as per the P-51, which means that we only need the Hamilton model suitable for A.74 (?) applications that Fiat chose and called the 5101. The -30 might be the clue – as the CR-42 had a 9′ 6″ prop diameter I need to find something in the right power and RPM range that is 10′ 6″ (30 cm – ie 12 inches – greater) in diameter ‘uncut’. Already I have an idea – I need to rummage.

Hi Matt
This is the blade for the CR-42, bracket type prop,3D-42, 5101-30.
I have looked at the 3D-40 and 6101 blades but there appear to be many differences, notably of course, metric threads and obviously the spider being size 42 as opposed to 40. Now if we could get some drawings? We have tried the company files in Turin, nothing yet.
Companies are out there to do the work but we need fits and clearances and blade profile drawings.

Interesting that you should mention the G-59. Many years ago I supported I-SPIT for Franco Actis and we recovered some G-59 props which we found to be very similar to the Mustang prop.

OK – either:

An early 1930’s US Navy design (just going by sequential drawing numbers),

A typo for 5010 – the Fiat Aviazione manufactured Hamilton-style blade made for Italian Merlin applications – such as the G-59

A typo for 6101

Apart from that, can’t really find anything in that range – presuming this a Hamilton prop? One thing to note is that none of the 5,000 series – mostly Navy designs – were for controllable-pitch hubs. If that is what you are looking at then 5xxx is not the blade number.

I am interested in what it is you have come across

Cheers,

Matt

I’ve been away.. yes, give me 24 hours.