Search: Posts Made By: ZAGNUT
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01-05-2016, 05:06 AM
Replies: 246
Views: 23,116
Posted By ZAGNUT

that looks more than adequate but will still have...

that looks more than adequate but will still have the mess of tapping blind holes for the prop screws. with the 18mm thick flange at front you will be lucky to get 14mm deep threads and you will...
01-05-2016, 12:52 AM
Replies: 246
Views: 23,116
Posted By ZAGNUT

shorter is always better but be sure to leave...

shorter is always better but be sure to leave enough depth for the prop centering plug to stay nice and square with the clearance it has....i'm sure there are charts out there for that kind of thing...
01-04-2016, 11:30 AM
Replies: 246
Views: 23,116
Posted By ZAGNUT

if you neck it down to 40mm then you're only...

if you neck it down to 40mm then you're only saving ~40g....and then you have to worry about where the holes for your prop screws are going to end up.

with the rear of the hub at 32mm like it is...
01-02-2016, 06:08 AM
Replies: 246
Views: 23,116
Posted By ZAGNUT

there have been quite a few hub failures with the...

there have been quite a few hub failures with the cheap RCGF engines where the wall thickness was around 2mm. these are smaller engines from around 20cc to 45cc and no idea what alloy was used.
...
01-01-2016, 01:12 PM
Replies: 246
Views: 23,116
Posted By ZAGNUT

fine as long as the tubing doesn't harden and...

fine as long as the tubing doesn't harden and leak at the barbed fittings with exposure to the fuel. small spring clamps would be good insurance.

i really would have left the hub full diameter...
12-27-2015, 11:06 AM
Replies: 246
Views: 23,116
Posted By ZAGNUT

maybe removing the hub from the mandrel put a...

maybe removing the hub from the mandrel put a scratch inside? air not escaping due to oil on the parts? that would feel spongy and not a hard stop though.

is the plug steel or aluminium?

and...
11-26-2015, 05:11 PM
Replies: 246
Views: 23,116
Posted By ZAGNUT

would be nice if the 10mm spigot was bored and...

would be nice if the 10mm spigot was bored and taped for a small clamping screw to hold the prop.

having the 10mm spigot integral to the jig is a much better idea than tapping the jig for an...
11-25-2015, 11:19 AM
Replies: 246
Views: 23,116
Posted By ZAGNUT

misread, i thought you were talking about...

misread, i thought you were talking about putting the 10mm spigot on the actual prop washer instead of in the hub....probably not a great idea anyways.
11-25-2015, 09:54 AM
Replies: 246
Views: 23,116
Posted By ZAGNUT

with the amount of beef there i wouldn't worry...

with the amount of beef there i wouldn't worry about not having a chamfer. if you were necking the hub down in the center and using something nasty like 7075 then it would start being important.
...
11-15-2015, 10:21 PM
Replies: 246
Views: 23,116
Posted By ZAGNUT

the toilet stall stuff is 10-15mm thick and...

the toilet stall stuff is 10-15mm thick and usually faced both sides with formica or the like. core is dark red to brown. vandal proof, burn proof and easy to clean.

i believe in the states you...
11-14-2015, 07:27 AM
Replies: 246
Views: 23,116
Posted By ZAGNUT

yep, same stuff, the toilet dividers usually...

yep, same stuff, the toilet dividers usually have formica on both sides. very easy to machine, sand and polish when compared to G10/FR4. not as strong but plenty good for this application, same...
11-14-2015, 02:19 AM
Replies: 246
Views: 23,116
Posted By ZAGNUT

only reason to stick with one of the standard...

only reason to stick with one of the standard prop screw patterns is borrowing props from other modellers. for your engine size that would mean the 29mm xM5 pattern but that sounds like it won't...
10-28-2015, 12:58 PM
Replies: 246
Views: 23,116
Posted By ZAGNUT

general rule is to go over size by 1/1000 of your...

general rule is to go over size by 1/1000 of your bore diameter...1 micron per mm or 0.001" per inch.

so about 0.02mm should be good. heating your hub to 150C over ambient will make it around...
10-25-2015, 10:24 AM
Replies: 246
Views: 23,116
Posted By ZAGNUT

my hub is 41mm in diameter and is a pretty good...

my hub is 41mm in diameter and is a pretty good fit for 22" props, you could go a bit larger.

yes, M5 screws are pretty much the standard. grade 12.9 is the best way to go and even those can...
10-18-2015, 07:38 AM
Replies: 246
Views: 23,116
Posted By ZAGNUT

in the lathe you would need some way to index the...

in the lathe you would need some way to index the spindle and live tooling to drill and tap for the prop screws. that's why i prefer to do the prop screws on the mill in the same setup i do the...
10-17-2015, 02:16 PM
Replies: 246
Views: 23,116
Posted By ZAGNUT

the plug with center shaft is just a very close...

the plug with center shaft is just a very close slip fit and held with the three set screws. needs to be easily removable to get the hub off the engine.

for hub removal i have a thick prop washer...
10-17-2015, 07:44 AM
Replies: 246
Views: 23,116
Posted By ZAGNUT

the hub stock that you put the pilot hole and...

the hub stock that you put the pilot hole and counterbore into is slid over the steel mandrel that you machined to fit and that is still chucked in the lathe. this mandrel is your work holder. a...
10-16-2015, 03:46 PM
Replies: 246
Views: 23,116
Posted By ZAGNUT

by single piece i mean that the tapered end is...

by single piece i mean that the tapered end is integral to the hub instead of being separate like with the zenoah or conversions where the flywheel is turned down.

yes, end of second paragraph the...
10-15-2015, 11:57 PM
Replies: 246
Views: 23,116
Posted By ZAGNUT

that is how the hubs are held on the larger...

that is how the hubs are held on the larger zenoah engines but with only two screws. aftermarket adapters to replace the small flywheel are available. no idea if the taper is the same but if it is...
10-14-2015, 02:43 AM
Replies: 246
Views: 23,116
Posted By ZAGNUT

would be wise to go with C3 bearings. most large...

would be wise to go with C3 bearings. most large two strokes use that or even looser.

standard clearance CN bearings will often die prematurely in this type of application.
10-13-2015, 10:59 PM
Replies: 246
Views: 23,116
Posted By ZAGNUT

forgot, 17x23 is a standard seal size but still...

forgot, 17x23 is a standard seal size but still might be wise to go OEM so you are for sure getting something with the correct material and sealing properties.
10-13-2015, 09:53 PM
Replies: 246
Views: 23,116
Posted By ZAGNUT

put the crank in a garbage bag with only the...

put the crank in a garbage bag with only the clutch end poking through a tight hole and use a thin cut off disc in an angle grinder. go slow and even cool it with water from a spray bottle to keep...
10-11-2015, 10:17 PM
Replies: 246
Views: 23,116
Posted By ZAGNUT

i'm guessing the bearing size would be a 6203 or...

i'm guessing the bearing size would be a 6203 or 17mmx40mm....if so then the open type using oil is good for 21k and the standard contact seal with grease for 12k rpm. if you're up to it then using...
10-11-2015, 03:13 PM
Replies: 246
Views: 23,116
Posted By ZAGNUT

the case does need to be sealed well and standard...

the case does need to be sealed well and standard contact seal bearings don't always cut it. only reliable way to use these is to leave both seals in place and rely on the grease for lube..... the...
06-01-2014, 11:15 AM
Replies: 10
Views: 861
Posted By ZAGNUT

the RCEXL can be bought with different caps to...

the RCEXL can be bought with different caps to fit just about anything you might use on a gas engine:

glow plug sized 1/4-32

10mm CM-6

14mm taper seat with 5/8" hex

14mm gasket seat with...
Showing results 1 to 25 of 500
 


 
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