How to Build a 1/87 Scale RC truck a.k.a.TTTT - Page 7

arch2b · #91 01-30-2003, 10:23 PM

i have spent countless hours browsing the german ttt sites including thorsten's

i had stumbled into bit's and moded them as much as i could. i got into my mini z for a while and forgot about my bit's.

then i got my overland and started talking to my new friend overlander

and remembered thorsten's and other sites for the ttt's. that's how, as overlander said, this thread began.

i got some prices for those who are new to the thead or just curious as to what costs are involved. these are approximates and not exact.
faller car system starter set - $50
roco miinitanks 470 man 4x4 - $8
gwsr-4pt reciever - $22
gws pico servo - $20
batteries - $2-5 each (has anyone priced an assembled 4pack)
gwt-4a transmitter - $30
gws cn12-b2 motor - can't find price. would the motor from the faller car work?
add cost of brass parts - screws, nuts and washers are expensive.
add cost of soldering supplies - rather cheap
add cost of burns, cuts, cursing in frustration, wife complaining your spending to much time on it, you little kids trying to use you as a jungle gym as your trying to assemble a size 80 brass screw-nut and washer and other trials and tribulation.

all you have to do is look at overlander's, killer's and thorsten's work to know it's worth it.

killer · #92 01-30-2003, 10:35 PM

Quote:

Originally posted by Overlander
arch2b,
Yikes That will be good training for a TTTT No need to promise though, you have kids too

JTM and Killer,

The root of the Rx vs. Tx issue is thatWE CAN NOT GET 27MHZ GWS RECEIVERS IN THE U.S.!!

Killer has offered to be a smuggler. I'm in.

-Todd

:ö: ssshhh.. not too loud!

, just curious, why is it illegal for you to use such frequenzy on country?.

guys, i'll be needing your suggestion on how i can send your 27MHZ GWS reciever to you, the 27MHZ "crystals" are easier to send thru regular mail.

ei, if you have a friend here or will be visiting here in the Philippines ask him to visit me here at Pan Pacific Hotel Manila, i work there.
send me an e-mail first at killer_d76@digitelone.com

Arch,
yup! you can do it!, this little things are sooo cool!!!.. GO FOR IT!!!!
right now... i'm obsesed with this trucks!

thanks to Thorsten!

JTM,
yes, you can use your Futaba FMtx on a 1/87 rc with GWS FM rx, i am using a Futaba 3PDF 3channel pistol type transmitter on my 1/87 with a GWS rx, which is the same "tx" i used on my 1/10 TamiyaTB-01 evo VI rally car..

-æ

JTM · #93 01-30-2003, 10:48 PM

i have a hitec AM transmitter, so i need a set of crystals and then a micro reciever and micro servos... how much is it for s set of crystals i can use in this Tx (and it would also come with one for the Rx right?) also i need a reciever right? what kind should i get (cheap) and you think you could send me one with the set of crystals, check how much it would be for post to 93705.. that would rock so much.

Overlander · #94 01-30-2003, 10:52 PM

Quote:

i'm obsesed with this trucks! thanks to Thorsten!

Golly, what about me...

It is not leagle because the FCC (Federal Communications Corperation) has designated all RC models to be used on ground or water to be on 27MHZ or 75MHZ, and all RC models to be used in the air to be on 72MHZ.

I think the frequencies were getting so crowded that some boat modelers radios were interfering with airplane modelers radios and causing them to crash into people, causing serious injury. So they separated the frequencies

arch2b · #95 01-30-2003, 10:53 PM

killer
you've got mail

jtm
i've priced some stuff above.

killer · #96 01-31-2003, 12:39 AM

Quote:

Originally posted by JTM
i have a hitec AM transmitter, so i need a set of crystals and then a micro reciever and micro servos... how much is it for s set of crystals i can use in this Tx (and it would also come with one for the Rx right?) also i need a reciever right? what kind should i get (cheap) and you think you could send me one with the set of crystals, check how much it would be for post to 93705.. that would rock so much.

:ö: JTM,
You have a HiTec AM transmitter that you use on your 1/10 rc kit right?, then you already have a fair of crystals!(one on your transmitter and the other one is in your car rx).. there's no need to buy a new set of crystals (if you need a spare then there's a need), all you need now is a Micro RX, 2pcs. Micro Servo (you'll be needing only two for the truck, one for steering and one will be modified to be used as your speed controller).. rule no.1 for this project truck," the smaller the better!".
-æ

Silentbob343 · #97 01-31-2003, 03:20 AM

Could you use a bit motor? I have an abundance of thoese laying around.

4-Channel GWS Naro Receiver (JR) GWR4NH72J 1 $21.95

GWS Pico BB Servo (JR) GWSPICBBJ 1 $21.95

Crystal for GWS Pico and Naro Receivers ( For both JR and Futaba 72 MHz Band) GWX1R72XXX Channel: 11 1 $7.45

GWS ICS-50E ESC (JR) GWICS50EJ 1 $14.75

Total: $66.10

Arch where did you find the Tx for so cheap? I found a place that was selling one for 34 but it didn't ask what channel I wanted. And did you make your own speed controller? if so from where did you get the parts for it?

and curse you people for getting me interested

arch2b · #98 01-31-2003, 05:47 AM

s.bob
i rounded my figures but they are about the same as yours.
i found a lot of the gws stuff @ balsa producrs

if you have found a good place to get these parts post a link.

has anyone tried using a pillow ball joint for the rear axle? similar to the overland but in reverse. it would allow movement without a stationary pivot point to get in the way of the gearing at the axle. just need small springs, similar to what qfm sells as suspension upgrade spings. anyone know where to get i tiny pillow ball screw and socket peice? i know i've seen this done on a german site, so it can be done.

Silentbob343 · #99 01-31-2003, 03:47 PM

oops sorrry about not including the link

http://www.aeromicro.com/Catalog/index.htm

arch2b · #**100** 01-31-2003, 04:16 PM

i found a battery pack @ batteriesamerica
ap-nimh
ap-150aaah
150 mah 1/3aaa
4.8v w/ leads____$13

connectors installed (futaba/jr-hitec/airtronics)__$3

the charger, udq-9000 universal charger/conditioner____$50
thats a little steep.

thorsten/overlander/killer- how do you charge your batteries? or do you just buy a lot and replace them when they die.

as you can guess, i'm trying to put together an inventory sheet with parts and prices. i'm trying to get as much as i can from one place to save on shipping. this will help me plan out my project as it will have to be done on the weekends (i'm planning for the month of febuary).

another question-
how do you modify the second servo electronics to make the speed controller?

JTM · #**101** 01-31-2003, 04:31 PM

i apporiximate this project being anywhere from 110 to 200 bucks more if you have to buy a transmitter.

arch2b · #**102** 01-31-2003, 04:39 PM

hopefuly killer can come through and we won't have to buy a transmitter, just an AM reiceiver and crystals.

Overlander · #**103** 01-31-2003, 06:59 PM

I just published a How To on building a speed control from a servo.

Go here to check it out!
http://tinyrc.com/forums/showthread....&threadid=7752

-Todd

Silentbob343 · #**104** 01-31-2003, 08:01 PM

Thanks over

arch2b · #**105** 01-31-2003, 10:34 PM

once again, great directions! thanks.

another question-
the reciever, batteries, servo and such have choices as to what kind of connectors you would like such as futabab, airtronics or hitec. which do i get and i assume all have to be the same for whichever i choose.