1275 replies to this topic

[stevefzr]

What's the deal with bevel gears?

Are they any good? They always feel like they have more drag than plastic ones. Do they rob power? Intuitively it seems they would only on motors with very little end float as the clearance would change as the arm moves back and forth.  Although they feel like they have more friction, my bevel gear atlas seems just as quick as my nylon gear one.
Will bevell gears work with the power of the gp7 b can I'm running?
Regards Steve c

[slotbaker]

I was thinking bevel gears too, due to the finer pitch than 48, as long as the motor box/bracket was strong enough to ensure good mesh, I thought they would handle it OK.

Interested to hear what others think.

[havlicek]

Well, I have my motor down to two arms and a single Green Can setup. It's down to a toss of the dice to figure this out

This one's a B&H* Hemi:


...so now it's down to "hot" or "REALLY HOT". eenie meenie miney mo

-john

(*Bugenis-Havlicek is way too many syllables, "B&H" is easier )

[One27ray]

John, like the orange motor



Soooooo what did you do to Brians Pink lady ? I have one I got from Brian years ago Still in the package, waiting to be unleashed

[Gator Bob]

[havlicek]

Thanks Ray and Bob

Soooooo what did you do to Brians Pink lady ? I have one I got from Brian years ago Still in the package, waiting to be unleashed

Not knowing for sure if Brian wants me to spill the beans at this early stage, I'll let Brian say. All I will say is that you need to be at least a little careful with the "B" motors, but even so, you can go WAY further than you could with a semi-stock Mabuchi You've got an endbell made of actually apporopriate material (instead of candlewax), and strong magnets. I just noticed though that the springs in the packed B above are "upside down". MUCH better if the long leg is on the bottom of the spring tower.

-john

[Jairus]

Well, John is a head of me in the motor department. I stlll have to hear mine turn over.
But, did a little work on it last night getting the magnets fitted and with a set of .030 shims have the endbell fitted as well. The arm spins very nicely inside with a resounding thump, thump, thump, thump....


The "arm" is a vintage "RehCo" #24 that I've been saving for the right project. Gold dust brushes, Mura light springs and a steel pinion round out the bits. Hope to have it together tonight, but right now I have to work.

Edit: By the way, pretty orange color John. That paint has to add a gram or two. ;-)

[havlicek]

Holy guacamole Jairus...with a 24S, I guess you don't plan on being "timid"! My hotter arm choice is a #25S and I'm a little worried about that one. May the god (or is it "goddess") of thingies be with you!

-john

[One_Track_Mind]

Hi John & Ray,
I simply don't mind what is said about my motor. After all, it's in the motor winding thread somewhere? Can't point you to an exact page!

What all the tickling John, has done to this motor, I feel pretty confident that it won't let out the majic smoke he has jammed into it!

I just wanna race the Mura B pink in competition!

[havlicek]

OK then I will say that a Mura B could probably survive (?) with a big wire arm with dynamic balancing and a very careful setup (see Greg's excellent article/post on this). The way I look at those things, they seem much better suited to a typically heavy pro-type anglewinder, and even then with at least a little "air control" (not to mention someone with a great touch driving the thing). Most of these cars, even the ones with the minimal "floppy pans", are going to be way lighter than that and it's going to be something like stuffing a blown rat motor into a Chevette. I could be wrong about that as almost anyone here has much more current track experience than moi

-john

[Jairus]

Well, the modern wing racer has a lot of h.p. stuffed into a pretty light chassis. Just saying...

[MantaRay]

Those Heat Treated Aluminum Chassis' are stronger than what we will be using and they still get bent up...........keeping them on the track and making laps will be the key

[havlicek]

Well, the modern wing racer has a lot of h.p. stuffed into a pretty light chassis. Just saying...

You're right about that (although maybe more RPMs than the torque of the old Muras) Jairus...but they also have wings to help keep them where they're supposed to be. We might be seeing more "air" than "smoke" with this one! Either way, it should be plenty exciting

-john

[Jairus]

Well, I do plan to run a lot of laps on the car BEFORE submitting it to the rigors of a race. If it's going to blow smoke, I'd rather work that out before hand.

[Gator Bob]

Jairus,
What are the two meytal strips in the motor pic.? Two grams of sink?

[macman]

So... I need a 16d motor bracket... Any body got a spare?

[Matt Sheldon]

Jairus,
What are the two meytal strips in the motor pic.? Two grams of sink?

I believe they are endbell shims to fit that endbell to the can being used.

[Gator Bob]

I believe they are endbell shims to fit that endbell to the can being used.

Thanks Matt.
I didn't make the "A" in a "D" connection.

[HarV Wallbanger III]

Spacers for the endbell Bob....

[Jairus]

Make that "B" in a "D" Bob.

Ben, these guys here have your motor bracket for just a few bucks.
http://www.ncphobbie...-cars/aml1027s/

[Gator Bob]

Alphabet soup. lol

Now that could bee a Rotor

AB/DC "TNT oi, oi, oi"

[Gator Bob]

It's down to a toss of the dice to figure this out


...so now it's down to "hot" or "REALLY HOT". eenie meenie miney mo

-john

Ditto

[HarV Wallbanger III]

Make that "B" in a "D" Bob.

Ben, these guys here have your motor bracket for just a few bucks.
http://www.ncphobbie...-cars/aml1027s/

These guys do not answer phone messages the 2 times I have called! I don't know if I trust them! I will see if Roger at Mid-America has them!

[Jairus]

I'd go with the hot for both of you guys.
Nothing on the tube tonight so dialed up some rock music and got that motor together. A single 24 doesn't seem so hot to me on the test bench. I do have a Certus 26 that I can pop in if this doesn't work but... till then I hope to have a chance to get my entry finished and on the track for testing by next weekend.


Updates as they happen.

[Jairus]

These guys do not answer phone messages the 2 times I have called! I don't know if I trust them! I will see if Roger at Mid-America has them!

They might not be opened on the weekends. I generally order on-line and the stuff shows up in the mail box a few week days later.