RCCrawler Forums

JohnRobHolmes · 07-22-2005, 10:26 PM

im in the first stages of the Mad Hopper project. its basically a first running model that works.

the axles are Mad Force / Twin Force axles. Traxxas Revo driveshafts mated up to an Emaxx tranny full out the driveline. The wheelbase turned out around 17 inches or so.

The electronics are a JR six channel digital ground radio, Castle Creation Mamba 25 ESC, and a MP Jet "540" outrunner. Ive just been using six cell sub C packs.

On to pics.

edit: Post up if the pics look too dark. The contrast seems to be lacking because its too dark on my screen. I want others' opinions on them.

Reflection · 07-22-2005, 10:47 PM

Looks like a good start. Why the maxx tranny and not the Twin tranny? Just curious.

The pics are a tad dark but still visable,the first pic is probly the worst as far as being to dark. The rest seem to be a little better.

JohnRobHolmes · 07-22-2005, 11:02 PM

i used the maxx tranny because i bought it as a mad force. nitro centerfugal three speed. i want the two speed because of flexiablity, and i have a few tricks up my sleeves as well. so far i have broken two upper links from driving. im going to have to make this thing bullitproof for the future. i would say it goes 8 to 10 mph now in second gear. i want to hit 40 or 50 and still be able to handle any slow speed crawling too.

darkest pic fixed. This was going to be the buildoff rig, but I couldnt hold the cat in the bag. im starting to be an attention *****.

Focker out....

jimbobmarley · 07-23-2005, 05:58 AM

10mph or 40 mph

wow - you would have to have a major difference between the two gears

like 72:1 and 18:1

it can easily be dont tho - so be nice to see
they way i would do it is to run to transmitions over each other

CHECK OUT THIS IDEA

just run a double motor plate and have one motor with a gd-600 gear reduction
and one without

run the motor in the gear reduction for crawling and put it in the other slot for top speed with a 17t pinion or something

---------------------------------------------------------------------------------------------------
but im sure you hav come up with something far more complicated

willyrocket · 07-23-2005, 10:29 AM

IMHO, I think its not a contrast issue, but maybe backlighting????????????

Nice rig, how bout callin it the "Velvet Crawler"!!

Nice servo mounts, let us know if they rotate on the tube or not. I have access to lots of adel clamps.....

nd4spdbh · 07-23-2005, 10:35 AM

that would be pretty sweet if you could make it go 40 then flip a switch and have it go like 5-10 mph with a crawl ratio of like 70:1

sweet truck too

snakeman · 07-23-2005, 01:22 PM

Quote:

Originally Posted by jimbobmarley

....
just run a double motor plate and have one motor with a gd-600 gear reduction
and one without

run the motor in the gear reduction for crawling and put it in the other slot for top speed with a 17t pinion or something

---------------------------------------------------------------------------------------------------
but im sure you hav come up with something far more complicated

I was going to take two motors like you said, use a gd600 on one, and leave the other w/ stock gearing. My only concern was the handling at speed. suspension eing soft enough for crawling and stiff enough to handle high speed bumps. Try it and see, would be very interesting.

radishkid · 07-24-2005, 06:35 AM

I'm digging the possibilities of that outrunner brushless you have mounted on that truck. I'm interested in getting one as well for a project, but I'm just putting the finishing touches on my clod ($$$). Is that the system you were talking about in the electronics thread?

JohnRobHolmes · 07-24-2005, 06:49 PM

yeah, thats the same setup radish. its been flawless so far. it works better than i thought it would.

the clamps have worked good too. the way i have it set up, it clamps down on the axle when i tighten it. i dont think its going anywhere for a while.

JohnRobHolmes · 07-26-2005, 05:44 PM

wow. my post got deleted.

just posting some more pics up. the crawler handles very nice, and does well on vertical for a shafty. it needs to be lowered.

i am in the process of redesigning the chassis whist i fix some broken links. it will be a few weeks probably because my work is going through turning over about 100 duplex sides in a few days.

shafty do good. fast speed ahead in future. suspension tricky part say white man.

sean_lv_crawler · 07-28-2005, 03:40 PM

Killer rig, keep up the nice clean professional work! and funny signature hahaha!

JohnRobHolmes · 07-28-2005, 04:36 PM

hehehe. you know it about the sig. the "missisng post" that i refer to in post ten decided to show itself elsewhere on the board.

thanks for the compliments man. i feel that this rig is my best built and designed so far. its got its kinks, but it loves the velvett!

krawlr · 07-28-2005, 06:56 PM

I like those lower links. Arrows?

Will · 07-28-2005, 08:27 PM

^^^yea i was thinking the same thing

JohnRobHolmes · 07-28-2005, 08:47 PM

yep. the lowers are doing great. ive broken the upper carbon arrows to smithereens. big rocks + 15 mph downhill = lots of broken things. thats why i want it to go faster, so i can just gap the dang rocks.

RCALLOYS · 07-29-2005, 11:07 AM

Looking good. I am diggin' the camo lower links :-)

RCMFMaxxMan · 08-01-2005, 06:05 PM

if you go for the wide gap between low gear and high gear you'll have to be careful about downshifting because if you are going 40 and you shift to low gear you'll end up blowing your motor or the gears or somthin. Like in a real car if you are in any gear above first and you downshift to 1st you will blow somthing up. That is a very cool rig though.

JohnRobHolmes · 08-01-2005, 06:51 PM

im not gonna hit 40 with just higher gearing. the emaxx tranny is gonna stay the same. i really need to finish up the chassis so i can mount everything up. im working turnover this week though and i am responsible for doing maintenance on 50 buildings in five days. probably more once i get done with those.

thanks for the replies and compliments guys. i wish the Mad Hopper was still so clean and shiney! i just wish it were running actually. since i took the tranny out to mock up a tuber i havent gotten it back together. ill be back soon with something new though. just gotta wait on that radio to get back with all centering gimbals.

JohnRobHolmes · 08-28-2005, 08:11 PM

Ive been testing different setups with the Mad Hopper, and i have found out what doesnt work.

the batteries need to be on the axles. it just doesnt work well with they are on the chassis.

Using one inrunner brushless and one outrunner brushless doesnt work for high speed mayhem like i thought it would. No golden ticket for me. The magnetic power and cogging of the outrunner drained and heated up everything and didnt give me good speed that i would use. It was like having the Ebrake on.
-option one to fix the problem would be to make a wide ratio tranny. i dont think i can get a brushless motor that will act well under stall situations and still put out the power to keep a heavy rig going 40. well--- a large inrunner 4 pole plettenberg motor would work but they are mucho$$$.
-option two is to make a tranny that selects one motor or another. it will add a pound of weight to run two motors, but i can sacrifice one pound for high speed at the current junction in time.

the servo holder is working flawless. It doesnt move, and i dont think it will until i loosen it.

Brute_Crawler · 08-29-2005, 09:17 AM

what if you ran two outrunners sliylty out of sync on seperate controlers, so one is always half way between locks. that might help eliminate the week spot on the motor's rotation.

07-22-2005, 10:26 PM	#1
JohnRobHolmes owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down! Posts: 20,290	Mad Hopper im in the first stages of the Mad Hopper project. its basically a first running model that works. the axles are Mad Force / Twin Force axles. Traxxas Revo driveshafts mated up to an Emaxx tranny full out the driveline. The wheelbase turned out around 17 inches or so. The electronics are a JR six channel digital ground radio, Castle Creation Mamba 25 ESC, and a MP Jet "540" outrunner. Ive just been using six cell sub C packs. On to pics. edit: Post up if the pics look too dark. The contrast seems to be lacking because its too dark on my screen. I want others' opinions on them. Attached Images Last edited by JohnRobHolmes; 07-22-2005 at 11:07 PM.

07-22-2005, 11:02 PM	#3
JohnRobHolmes owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down! Posts: 20,290	i used the maxx tranny because i bought it as a mad force. nitro centerfugal three speed. i want the two speed because of flexiablity, and i have a few tricks up my sleeves as well. so far i have broken two upper links from driving. im going to have to make this thing bullitproof for the future. i would say it goes 8 to 10 mph now in second gear. i want to hit 40 or 50 and still be able to handle any slow speed crawling too. darkest pic fixed. This was going to be the buildoff rig, but I couldnt hold the cat in the bag. im starting to be an attention ****. Focker out.... Last edited by JohnRobHolmes; 07-22-2005 at 11:08 PM.*

07-23-2005, 10:29 AM	#5
willyrocket Quarry Creeper Join Date: Jul 2004 Location: Elizabeth City NC Posts: 250	IMHO, I think its not a contrast issue, but maybe backlighting???????????? Nice rig, how bout callin it the "Velvet Crawler"!! Nice servo mounts, let us know if they rotate on the tube or not. I have access to lots of adel clamps..... Last edited by willyrocket; 07-23-2005 at 10:31 AM.

07-26-2005, 05:44 PM	#10
JohnRobHolmes owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down! Posts: 20,290	wow. my post got deleted. just posting some more pics up. the crawler handles very nice, and does well on vertical for a shafty. it needs to be lowered. i am in the process of redesigning the chassis whist i fix some broken links. it will be a few weeks probably because my work is going through turning over about 100 duplex sides in a few days. shafty do good. fast speed ahead in future. suspension tricky part say white man. Attached Images Last edited by JohnRobHolmes; 07-26-2005 at 11:12 PM.

07-22-2005, 10:47 PM	#2
Reflection TEAM MODERATOR Join Date: May 2004 Location: Tennessee Posts: 10,855	Looks like a good start. Why the maxx tranny and not the Twin tranny? Just curious. The pics are a tad dark but still visable,the first pic is probly the worst as far as being to dark. The rest seem to be a little better.

07-23-2005, 05:58 AM	#4
jimbobmarley Pebble Pounder Join Date: Apr 2005 Location: England Posts: 113	10mph or 40 mph wow - you would have to have a major difference between the two gears like 72:1 and 18:1 it can easily be dont tho - so be nice to see they way i would do it is to run to transmitions over each other CHECK OUT THIS IDEA just run a double motor plate and have one motor with a gd-600 gear reduction and one without run the motor in the gear reduction for crawling and put it in the other slot for top speed with a 17t pinion or something --------------------------------------------------------------------------------------------------- but im sure you hav come up with something far more complicated

07-23-2005, 10:35 AM	#6
nd4spdbh Rock Crawler Join Date: Mar 2005 Location: Dude on my dirt bike in SoCal!!! Posts: 949	that would be pretty sweet if you could make it go 40 then flip a switch and have it go like 5-10 mph with a crawl ratio of like 70:1 sweet truck too

07-24-2005, 06:35 AM	#8
radishkid Quarry Creeper Join Date: Nov 2004 Location: In the saddle... Posts: 473	I'm digging the possibilities of that outrunner brushless you have mounted on that truck. I'm interested in getting one as well for a project, but I'm just putting the finishing touches on my clod ($$$). Is that the system you were talking about in the electronics thread?

07-24-2005, 06:49 PM	#9
JohnRobHolmes owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down! Posts: 20,290	yeah, thats the same setup radish. its been flawless so far. it works better than i thought it would. the clamps have worked good too. the way i have it set up, it clamps down on the axle when i tighten it. i dont think its going anywhere for a while.

07-28-2005, 03:40 PM	#11
sean_lv_crawler Quarry Creeper Join Date: Oct 2004 Location: vegas Posts: 310	Killer rig, keep up the nice clean professional work! and funny signature hahaha!

07-28-2005, 04:36 PM	#12
JohnRobHolmes owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down! Posts: 20,290	hehehe. you know it about the sig. the "missisng post" that i refer to in post ten decided to show itself elsewhere on the board. thanks for the compliments man. i feel that this rig is my best built and designed so far. its got its kinks, but it loves the velvett!

07-28-2005, 06:56 PM	#13
krawlr Newbie Join Date: Mar 2005 Location: Cincinnati Posts: 21	I like those lower links. Arrows?

07-28-2005, 08:27 PM	#14
Will Quarry Creeper Join Date: Jan 2005 Location: New Orleans Posts: 265	^^^yea i was thinking the same thing

07-28-2005, 08:47 PM	#15
JohnRobHolmes owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down! Posts: 20,290	yep. the lowers are doing great. ive broken the upper carbon arrows to smithereens. big rocks + 15 mph downhill = lots of broken things. thats why i want it to go faster, so i can just gap the dang rocks.

Sponsored Links

07-29-2005, 11:07 AM	#16
RCALLOYS Quarry Creeper Join Date: Sep 2004 Location: St.Louis, MO. Posts: 369	Looking good. I am diggin' the camo lower links :-)

08-01-2005, 06:05 PM	#17
RCMFMaxxMan RCC Addict Join Date: Jun 2004 Location: ORegon Posts: 1,002	if you go for the wide gap between low gear and high gear you'll have to be careful about downshifting because if you are going 40 and you shift to low gear you'll end up blowing your motor or the gears or somthin. Like in a real car if you are in any gear above first and you downshift to 1st you will blow somthing up. That is a very cool rig though.

08-01-2005, 06:51 PM	#18
JohnRobHolmes owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down! Posts: 20,290	im not gonna hit 40 with just higher gearing. the emaxx tranny is gonna stay the same. i really need to finish up the chassis so i can mount everything up. im working turnover this week though and i am responsible for doing maintenance on 50 buildings in five days. probably more once i get done with those. thanks for the replies and compliments guys. i wish the Mad Hopper was still so clean and shiney! i just wish it were running actually. since i took the tranny out to mock up a tuber i havent gotten it back together. ill be back soon with something new though. just gotta wait on that radio to get back with all centering gimbals.

08-28-2005, 08:11 PM	#19
JohnRobHolmes owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down! Posts: 20,290	Ive been testing different setups with the Mad Hopper, and i have found out what doesnt work. the batteries need to be on the axles. it just doesnt work well with they are on the chassis. Using one inrunner brushless and one outrunner brushless doesnt work for high speed mayhem like i thought it would. No golden ticket for me. The magnetic power and cogging of the outrunner drained and heated up everything and didnt give me good speed that i would use. It was like having the Ebrake on. -option one to fix the problem would be to make a wide ratio tranny. i dont think i can get a brushless motor that will act well under stall situations and still put out the power to keep a heavy rig going 40. well--- a large inrunner 4 pole plettenberg motor would work but they are mucho$$$. -option two is to make a tranny that selects one motor or another. it will add a pound of weight to run two motors, but i can sacrifice one pound for high speed at the current junction in time. the servo holder is working flawless. It doesnt move, and i dont think it will until i loosen it.

08-29-2005, 09:17 AM	#20
Brute_Crawler Rock Stacker Join Date: Jul 2005 Location: Canada, Ontario Posts: 51	what if you ran two outrunners sliylty out of sync on seperate controlers, so one is always half way between locks. that might help eliminate the week spot on the motor's rotation.

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