shaft diameter on feigao 540xl

[sailr]

Nice! Where did you get that gearbox! I have been seriously considering build some large scale boats. Yours likes really nice!

thanks for all the info. Here is the gearbox being used, currently 2:1, with the easy option of changing the ratio, this box eliminated the coupling, and the boat its in, so you can see the heavy lump I need to get moving fast!


Boat is not quite finished yet, fittings to go on, its going to be way over scale speed, but thats the fun!

[pmdevlin]

yes I tried RCU, and found this site shop and forum when looking for info on the feigao 540xl that was recommended on RCU.

Response and suggestions has been great here, many thanks, I never know where to post this question, as most serious race guys dont really want to talk about scale, but not the case her! many thanks

The gearbox was custom made by a friend, using belts and gears from MFA. I have tried a number of different graupner 700's, when peeps see the boat they think it is going fast, but it isnt, and this hull is designed to ride rough water fast, thats what I want, hence all the brushless questions. Most peeps dont have a brushless set up in this sort of boat, so its unknown territory!
Here is box in boat, and some more fittings on

Now you can appreciate why minimum 5mm shaft is important The shaft coming through the hull was bending after the gear, hence the extra bearing support, its fine now, all ball raced, thats why I think a 3mm motor shaft will bend, it wont handle the torque

[Brushless55]

yes I tried RCU, and found this site shop and forum when looking for info on the feigao 540xl that was recommended on RCU.

Response and suggestions has been great here, many thanks, I never know where to post this question, as most serious race guys dont really want to talk about scale, but not the case her! many thanks

The gearbox was custom made by a friend, using belts and gears from MFA. I have tried a number of different graupner 700's, when peeps see the boat they think it is going fast, but it isnt, and this hull is designed to ride rough water fast, thats what I want, hence all the brushless questions. Most peeps dont have a brushless set up in this sort of boat, so its unknown territory!
Here is box in boat, and some more fittings on

Now you can appreciate why minimum 5mm shaft is important The shaft coming through the hull was bending after the gear, hence the extra bearing support, its fine now, all ball raced, thats why I think a 3mm motor shaft will bend, it wont handle the torque

And that was I who sent ya to OSE !

[Ub Hauled]

LOL, small world!

[sailr]

That is one beautiful rendition of the Fairey Huntsman. The Huntsman itself has an interesting history. Was yours built from a kit or plans? I really do like the gear setup. Better than the plastic pinion gear arrangements. Looks a lot tougher.

You might want to look into the bigger 580 Feigao motors at OSE. I'm not expert though!

Keep us posted as to your results. VERY NICE INDEED!

[pmdevlin]

thanks brushless!!

sailr, I got it as a bit of a wreck, and didnt really know at the time what it was. Its circa late sixties, apparently the shapeof the bow, "pointy" makes it more desirable than the later copies that have a rounded bow? All ply, and very well made, I then gave it a total stripdown and rebuild, using detailed info from Fairey owners club, and available info from the web.

The good friend who did the gearbox, also convinced me to make the screen from Lexan, which took a lot of attempts forming it around an old biscuit tiin as a mould! rather than using thin plasticard. The air scoops are vacuum formed, another skill I have learnt in this build process, as are the seats. Windows are tinted, using window tint film that is used on cars .

I have one more brushed motor combo to try before buying the 540, I looked at the 580, but wasnt convinced it offered any more performance for the extra money, if anyone can advise that would be great

the final brushed trial will be a graupner 700bb turbo 9.6v neodyme. A friend has this in a large PT boat and it goes very well, but I think it might be very heavy and a real amp hungry motor, but its worth A try as I can borrow the motor.

[domwilson]

Very nice build. What is the size of the hull?

[sailr]

You did a beautiful job. That's for sure. As for the 580, it will have a lot more power than the 540 and thus will swing a bigger propeller. Maybe the Graupner will be just what you need. Being able to borrow it is a plus!

Keep us posted as to how it runs. A video would be great at some point.

thanks brushless!!

sailr, I got it as a bit of a wreck, and didnt really know at the time what it was. Its circa late sixties, apparently the shapeof the bow, "pointy" makes it more desirable than the later copies that have a rounded bow? All ply, and very well made, I then gave it a total stripdown and rebuild, using detailed info from Fairey owners club, and available info from the web.

The good friend who did the gearbox, also convinced me to make the screen from Lexan, which took a lot of attempts forming it around an old biscuit tiin as a mould! rather than using thin plasticard. The air scoops are vacuum formed, another skill I have learnt in this build process, as are the seats. Windows are tinted, using window tint film that is used on cars .

I have one more brushed motor combo to try before buying the 540, I looked at the 580, but wasnt convinced it offered any more performance for the extra money, if anyone can advise that would be great

the final brushed trial will be a graupner 700bb turbo 9.6v neodyme. A friend has this in a large PT boat and it goes very well, but I think it might be very heavy and a real amp hungry motor, but its worth A try as I can borrow the motor.

[sailr]

The Fairey Huntsman, as I recall, was a big winner of boat races in it's day also. It outperformed all of the others in its class and attained a lot of fame. It is a beautiful boat.

[785boats]

They used to do a lot of racing as sailr pointed out. And they stilldo.
Here's a couple of pics. One old & one new.

[pmdevlin]

nice pics 785

got the borrowed graupner neo today, but cant test till after weekend, family duties! will video the event and post, if its rubbish then no more delays, the feigao will be ordered, but.........
the 580 looks great, but its a lot more money, and I would have to get the 8 turn to have similar revs, not really sure what the turns mean??

Dom, its 4 feet long, big old thing! but should look quite nice up on the plane and going fast, wont be able to sail with other scale boats though, it might wreck them

[sailr]

"turns" is the number of wire windings in the motor.

[pmdevlin]

well some progress getting this big old girl to go fast. Tried the borrowed Graupner 700 BB Turbo neo, started with a small 2 blade 30mm prop, and worked up, doing very short stints, keeping an eye on motor temp (with water cooling)

Got up to 50mm (had previously ran 52.5mm with a 9.6v BB Turbo with no probs), boat was a bit faster, but still not the grin factor, then it started to go slow. Brought it in, neo had cooked. ESC cold, packs cold, but motor was steaming! On returning home, the packs had been exhausted very quickly, after only 10 mins, normally lasting a good 20 mins.

I have now installed a brushless align 600L motor, saw it as a real bargain on fleabay, only £25.00 virtually brand new, so thought it was worth a chance. Also got a Castle creations Barracuda 80amp forward/reverse superb esc from overlander batteries, brand new, half price as this model is being discontinued. WAs going to go down the hobbyking esc route, but over on a heli forum it appears that there has been a number of recalls.

Using a 2:1 ratio, it should deliver similar revs to the 700's, but the torque and power output is much higher, so fingers crossed. I have a feeling it will perform well, but run time will dramatically decrease, 15 mins flat out will be acceptable, if I want to "put put" around then I can run on a lead acid 12v!

[pmdevlin]

well its certainly a lot faster now with the align motor, which is running stone cold on 2:1 ratio, 52.5mm x prop, 19.2v nimh, sadly run time was a little shorter than I wanted at approx 12mins flat out before the packs started going off.

Tried several props, ranging from 4 blade cleaver, 3 blade steam, various 2 blade. I think I can fit (just) a 55mm, and need some extra packs so going to go up in volts, then I have the option of trying 1.5:1 ratio, and seeing how that goes, but I think its a bigger lake next time!

http://www.youtube.com/watch?v=OD9dnbj8bJA

[785boats]

Man! That looks great.
If you're happy with the speed I wouldn't increase the voltage. Just add another pack the same size in parallel. This should double your run time (almost). It will also allow you to run a bigger prop without stressing the battery.
Of course a 6s 5000mah 25c lipo will make a big difference too. Two in parallel would be spot on. Both speed & run time would be up, but it might be wise to drop the prop size to 50mm to start with, if you go that way.
I'll say it again.
Man! that looks great.
All the best.
Paul.