Prop ID numbers

[Old Vetter]

Is there a cross reference chart for the different mfg's of propellers? For instance my boat runs good on a Pro Boat 1.6x2.5 prop but because it is plastic, it breaks very easily. How do I take these #'s and buy a similar prop from a different mfg? without spending a fortune via the trial & error method? Thanks

[lectriglide]

Here's one I've found helpful.

http://www.fastelectrics.com/octuraprops.htm

or this http://www.aquacraftmodels.com/acces...ropellers.html

For the Fastech and Blackjack, a very good prop is the Octura X642.
All these can be found here at the OSE store.

[NativePaul]

Not with any great accuracy as most folks use different blade shapes which will alter the load even with the same diameter and pitch, but you can work out the diameter and pitch easily enough for a rough aproximation, I couldn't find a proboat prop chart but if your proboat prop is 1.6"diameter and its pitch is 2.5" then these props will be approximates to your plastic one, please forgive me if you saw me talking about 2.5" 63.5mm diameter props before I edited it.
Also note that plastic props flex under load and whilst it may have 2.5" pitch static, its anyone's guess how much it has when loaded, probably less but no idea how much less.

Also you don't mention what type of hull you have or whether you want a lifting prop or a non lifter.

Octura use metric sizes, 1.6" is 40.6mm there are 2 types of Octura props in that size range (40mm or 1.57") that have a pitch of 1.6 times there diameter (2.52")the 1640 which is a lifting prop and the X640 which is a non lifter, lifters normally have spoon shaped blades and work on riggers and hydros and non-lifters have more pointed blades and work on cats and monos. or you can tey slightly bigger diameter and less pitch with the 1.65" diameter 2.31" pitch X442 non lifter

I only know Octuras well but there are other props you can check out,

Prather I think are all 1.5 pitch non lifters with the P215 being a close match to yours at 1.6 dia" and 2.5" pitch.

PropShop have the diameter as the first 2 digits then the pitch modifier as the last 2, the 4014E and 4214E are fairly close to yours at 1.57"x2.2" and 1.65"x2.34", but I don't know how to tell a lifter from a non lifter in their range if indeed they do both types.

ABC are numbered similarly to propshop with the first 2 digits diameter and last 2 the pitch modifier but in imperial measurement not metric so 1614 is 1.6" dia, 1.4 times that that in pitch (2.3"), and the 1616 is 1.6"dia 2.7 pitch, I'm not certain but I believe these number series props to be non lifters.
They also do a H series which I think stands for hydro making them lifters, the numbers for these seems to be just some bizzare code that makes no sense to me but the H-4 is 42mm/1.57"" dia with 66mm/2.6" pitch.

Grimracer do things differently and quote both the diameter and pitch in mm the closest being the 40x52 (1.57"dia X 2.1" pitch) which I think is a non lifter.



If anyone could clarify/confirm/refute that denotes a lifter in the non Octura ranges that I don't use I would appreciate it as much for my own good as for the OP, I'm sure I would make more use of PropShop in particular if I knew more about the characteristics of their props.

[Old Vetter]

Great info and thank you very much. My boat is a Dumas 24" wood tunnel hull with a REK outboard and Pro Boat BL motor and speed control on 4s. It's a nice running boat with speeds close to 40mph. I am not sure if the Pro Boat prop is a lifting prop. Does a tinnel hull need a lifting prop. What does a lifting prop do?

[NativePaul]

A lifting prop throws a lot of water downwards providing lift at the prop as well as backwards to provide thrust, which is usefull to keep the back end of a hydroplane out of the water. No you don't want a lifting prop for a tunnel, too much lift at the back will just ruin the balance and stuff the nose in the water making it run wet decreasing the speed, increasing the amp draw and making it hook in turns.