5th scale savage project
 

Ok, heres another large scale project. Yes, I already have the baja 5b brushless project, and another large scale project that I will not be unveiling till it is done...

But back to this, a 3rd project that should be reasonably interesting. Basically going to build a long chassis for savage front and rear assemblies. I plan to use a flux single speed tranny, with a flux motor mount and a neu 1527.

I already have the body, it is the proline desert rat 5t body: http://www3.towerhobbies.com/cgi-bin...&I=LXWKP5&P=ML

So the plan is to use a custom rc alloy's front center driveshaft, and a savage xl rear driveshaft to span between the flux tranny and the diffs. I have the rc alloys shaft and need to determine if the xl rear shaft will work with this body. Measurements were made with the hpi 5t body, which has a slightly different wheelbase. So we will see what the mockup shows.

Battery placement will be in front of the tranny for proper weight distribution. The motor and esc will sit behind the tranny as in the flux.

Now, of course this is inspired by HPI japan's savage 5t, no doubt about that. Since I do not plan to buy 24mm hexes and 5t wheels/tires, I will use some proline 23mm 40 series beadlocks and some sort of 40 series tires. I plan to narrow the beadlocks, and most likely narrow the tires too, most likely to something similar to the width of the std MT tire (such as a badland tire). This should be closer to the width of the Baja 5t tires, and maintain the scale-ish corr truck look.

I do not plan for this to be very heavy, maybe around 13-14lbs complete. So I think that I can get away with a single 1527 2y motor, and 12s lipo, both of which I have. I do not think that I will need a multi speed tranny, but mech brakes may be a requirement. So that means that I will not have reverse... I will gear it for around 40mph.

So here is the part that I need you guys to chime in on. What esc should I use? It needs to be able to handle 12s lipo, and the various demands a wheeled vehicle will place on it. I figure something that can handle 100amps cont should do, and burst needs to be about 200amps? And cheap or used would be preferable, as always. If the CC guys want to "loan" me a 12s Mega Monster Max (if you use that name I expect a little recognition Patrick, or a least a few test units!) I will not complain!

I will get some pics up of the body and other parts tomorrow at work (today?)...

Yet ANOTHER Savage project? I see you are using those f/r assemblies. Does that mean you are forgetting the first extended Savage?

As far as the esc --- plane esc? wish i could be more help Linc. especially after you helped me with my Savage so much. There was that one i was talking to you about. The 12s capable 100HV. On hobbycity.

Pictures ASAP, should be a sweet build. :yes:

I have more than 1 savage... Much like everything else I have!

I am a bit sceptical of a air esc, I do not think the burst rating will be enough. I went with a dual motor setup in the baja 5b conversion mainly because of this.

Hopefully Luciano will chime in with some sort of gangsta esc he had made...

Plugged some info into the calc:

Differential Ratio: 3.3076923076923075
Transmission Ratio: 2.215277777777778
Spur Tooth Count: 47
Pinion Tooth Count: 25
Total Voltage: 44.4
Motor KV: 625
Tire Diameter (inches): 6.5
Spur/Pinion Ratio: 1.88 : 1
Total Ratio: 13.77562 : 1
Tire Circumference (inches): 20.42 inches (518.68 mm)
Total Motor Speed: 27750 RPM
Vehicle Speed: 38.95 mph (62.57 km/h)

gangsta seems to be your favorite word lately. cant wait to see the savage completed. Shoot me a pm if you have any interest in a set of 1 run Savage xl tires

Yes, I am quite gangsta myself....


Anyways, looks like I will definitely need a xl rear driveshaft, the std x/flux rear driveshaft is a bit short... So I will have a look for a good deal on ebay!

I also plan to build some sort of cage to protect the body. Not sure if I should just weld some brake tube up, or try may hand at using nylon rod? I have a feeling the brake tube will hold up better, but it will add weight up top, which is really not desirable... Given the thickness of the body, it really needs something to support the top in the center, especially when the truck rolls over. Maybe a couple of roll hoops, that are attached to each other, and a pair of outriggers on the side between the wheels to hold the sides of the body. I may even put some high density foam on the sides for a little cushion (similar to the front bumper material on touring cars.).

I don't see any pics linc! :sleep:

Jesus, give me a break dog, photohole is taking its sweet time uploading them...

Ok, heres a few pics. The chassis shown has one flux tvp, and you can see it is a bit short with the front axle lined up with the center of the front wheel well. You can also see the "gangsta" custom shaft from rcalloys! "Very Nice, I like!" It is much better than my sister, who is #4 prostitute in all of Kazakhstan!

And the last pic shows the 1527 compared to a cc/neu 2200. It was in a ducted fan jet that routinely went past 150 mph! Zing! That is a 2y motor with 8mm shaft and m4 threads. Beastly!

http://i206.photobucket.com/albums/b...p/DSCF3367.jpg
http://i206.photobucket.com/albums/b...p/DSCF3368.jpg
http://i206.photobucket.com/albums/b...p/DSCF3369.jpg
http://i206.photobucket.com/albums/b...p/DSCF3370.jpg

And if you look carefully you can see Donald Duck's ass.

a-mazing. :yes:

Hey james, here's sme savage xl centre shafts for 16 bucks shipped...
http://cgi.ebay.com/NEW-HPI-SAVAGE-X...3A1%7C294%3A30

Also if you don't feel creative, here's the newera 1/5 conversion kit for the savage, 130 bucks.
http://www.neweramodels.com/item.cgi...=&part_id=3372

My god- only 38mph with a 1527..... HOW MUCH TORQUE DOES ONE MAN NEED?!!?

A lot to get that big son of a bitch moving. :lol:

I just got some, less than 12 bucks shipped and I got some cups too! http://cgi.ebay.com/ws/eBayISAPI.dll...m=120416975946

Thanks for thinking about me though Ian, you are a sweetie!

I try to do what I can to help, then get bored with that and start doing something else, but for a really cool project like this, I thought I'd give it a shot.

Thanks!

I do have a 1521 2.5y but I plan to put that in the 6x6 LST. However that truck may end up being heavier than this truck, so I may swap motors. The 1527 2y is almost the same kv as the 1521 2.5y, so gearing will not change. Not sure if Lutach's LT10 esc will handle the 1527 geared for 35 in the 6x6lst... I guess we will see, 10s at 100 amps at 75% eff is 3.5hp, so I guess it will be fine. Maybe it will work in this truck too... I guess I can give that esc a try, test its limits!

It will be long, but I do not plan to run a super heavy wheel tire combo. The cage/roll bar will add some weight, but I will try to design it to be as minimalistic as possible. Lots of large triangles for strength!

James! I thought we told you to never go near a large triangle again after last month's incedent....

Hmm, long day I guess, I do not follow you with that joke?

Anyways, I had a look at the 1/6 scale chassis you linked to. WB is only 18" and I need to go to about 22-23" to fit the body correctly. Design is basically the same, although I plan to use thinner al for the tvps and brace it so that it is lighter and stronger than a thick tvp chassis would be.

I doubt it's any use to you, but kershaw makes a 4" stretch chassis over the stock savage x tvps. It's also 130 bucks.

Lets find out :lol:.

I was going to pm and ask you what you thought about that... I guess we will see. I will start with conservative gearing. I have not done any sort of cap mod yet, I am guessing that would be a good idea? Since the truck will be heavier, braking stress will be higher. What caps and how many should I use? Any other tips? Maybe put a fan on the esc?

I used 2 Radio Shack 1000uF 50V caps just to see how they would perform and they did the job very well, but I do recommend the Low ESR 105C type capacitors. After the cap mod, leave the ESC as is without a fan, but check temps regularly and if it heats up then add one. Data log the runs to actually see how many amps your set up is pulling. I don't think the 1527/2Y will need a lot of amps to get your vehicle moving.

HPI quotes 22.5". Edit: The stock 5b-5t a-arms have some caster built into the a-arm mount so wheelbase will vary depending on ride height. I built my revo with 22.25" and it looks fine. Definitely keep it light and with as much weight as low as possible. My revo ended up with more weight up top than anticipated and likes to get up on 2 wheels, on the street and grass anyway. BTW I'm at 12.5lbs without the body or mounts.

Can't wait to see how yours turns out. I put my MMM combo back into the buggy until I can at least lower the battery and maybe add the kershaw extension kit to it. And maybe that 10s ESC!

That sounds about right for the WB. I should have the xl rear driveshaft in this week, and plan to get the 15" wb savage done by then... Need to spend some time at work after hours to get the tvps finished!

You do have alot on your plate. Sounds like you and me both need a shop at home. The less time we have to spend at work the better, even if it isn't "real" work.

Very true. If I go home I just play on the pc and watch tv... Sometimes I play golf or bolwing on the wii... Or some Matt Hoffman on Dreamcast.

I will try to get alot done this week. At least with rc! I have a feeling that I will be drunk this weekend, only turn 29 once!

That's the spirit :party:

Yeah, the wife is taking me out to dinner, gotta love hibachi, and I am sure the sake will flow like wine and the women will flock instinctively like the salmon of Capistrano! Or something like that.

I may take Sat off and work on rc all day! Get you guys some well deserved pics!

:party:

I figured that would make you happy Ian!

You bet! :lol:

OK, bringing the 5th scale savvy back from the dead...

Anyways, I just traded a guy for a set of the HPI savage 5t tvps, custom motor mount, and center driveshafts!

So I will have something to start with and maybe, just maybe I can get this beast rolling! He also has it setup for a 1/4 scale seteering serov, which I am also getting from him. I will give it a try with the 1521 2y on 10s lipo with the lt10 esc. Gear conservatively at first. Not sure if I will run the 5t body with this chassis, but I want to get a feel for power requirements.

I really need to get back into rc, but I lost a guy at work (he moved to texas) and I am also trying to get my house ready to put on the market. I have been doing drywall repairs and installing lights all weekend. Plus I put in an offer on a big house today... Hope I can get it!

I will try to get all of this together and put some time on it... Maybe???

cool linc, it would be great to see this project get done

Congrats! did you already stake out your rc area?:lol:

Yeah, it certainly would!

it probably wont but stuff might get done to it!!!!! lol

Very likely! :lol:

Having one less employee at work has caused more work for me... Plus I decided to start cleaning my entire building and doing all of the needed repairs. Save for the roof, too cold and windy up there. That will have to wait for the late spring!

You might already have something better given your line of work, but I stole these from my wife, and they work GREAT for drywall sanding....no more dust in the eyes, and they dont fog as bad as other goggles.
http://www.amazon.com/dp/B000H43IVM/...l_26vi48gmks_b

Without a doubt these scream Pimp