Possible Hyper 7/Novak conversion
 

Just throwing out some ideas here, let me kno what you think!

So I have a HYper 7 roller sitting here, brand new and waiting for some brushless power. I also have a mm, ccbec, 2 trakpower lipos, and all the radio gear. Instead of the usual feigao motor, I would like to try the novah hv6.5 motor. Kv is a bit high, but on 4s it tops out around 45k rpm, which should be ok as the novak motors are made well. Gearing would be 11/46, so slightly under 40mph. I would also buy novaks mount kit, as it sounds interesting.

Any thoughts on this? The buggy should be reasonably light and novak's site says that the supply a pair of battery trays. I will wait to se the actual layout before I buy it though. I would also do the 5mm shaft upgrade, as people seem to snap the 1/8 shafts off.

Another issue is how well will the MM run the noavk motor? I know that the recent firmware updates make it a better esc. Will my combo of low gearing and light weight (hopefully!) help this?

As far as buggies go, I thought the H7 was a tad on the heavier side.

You may be correct, I have played with a few differnt buggies, but most of them were lower end so they all seemed very similar. I am sure that a rc8 or 8ight would be lighter.

The thing that worries me about these conversion is that they mount the motor on the wrong side of the diff; they diff has off-set from the center, away from the motor. Since electric motors use less space than nitro motors, and batteries take more room than the nitro tank, it's better for the weight ballance to put the motor on the opposite side.

I wouldn't take the 4.5, i would take the 6.5, since the gearing ratio is pretty tight on a buggy. The torque on the 6.5 would be slightly higher than the 4.5 since it has got more windings.

And get a hvmaxx with a 5mm shaft instead the normal 3.2; i heard a lot of people wasted the 3.2mm shaft on their rather 'direct drive' buggies. 5mm is the way to go.

If you have got enough room to mount the batteries, i wouldn't worry about the placement of the motor, since it's a convenience conersion.. I like the direct drop-in bolt on idea in general. It just needs some tinkering to get it worked out perfect. The nitro chassis isn't an ideal template to start with. (unless you move parts around)

Now, more questions, I have a plett maximum and it has similar ratings to the hv6.5. I may try it out, but the 1.8 sahft does worry me a bit. I will use a plastic spur, and will not be jumping the buggy. Whatcha think!

I'm interested as I've got a hyper7 PBS just waiting for the MMM. Would be cool to see what you come up with, what works and what doesn't...

Well, since I have the rcm motor mount for the hyper 7, I was thinking about picking up the rc product designs battery trays. This would give me a good mount for my trakpower packs and kep the cg low. Plus I like the bolt in approach.

I am a bit worries about the 1.8 shaft on the plett, not sure how good their service is. I guess if I broke it I would get them to replace it with a 5mm shaft. I also have a hacker c50 max motor that I could use. That may be the ticket, as it was cheap and I really would like to see how a low geared high speed motor works compared to the higher geared lower speed motors that I am used to. We shall see. ime to order some 1/8 buggy badlands!

hyper 7 pbs

pbs?

pivot ball suspension, like how the e-maxx, t-maxx suspensions are.

Ok, did some work on it earlier. No pics as the camera is dead and I do not have any other aas.

I installed the rcm motor mount and the hacker c50 maxx motor. Smallest pinion that will fit is a 13t. This is with the motor slid all the way to the end of the mount slots. There is also about 2mm between the motor and the rear center diff output, so that will be the gearing it gets! I replaced the steel spur with a kyosho 46t spur. Fits nicely, but it may need another diff gasket or two to get the front center diff bearing completely in the front bulk.

I also ordered a set of the rc product designs battery trays for the hyper 7. They look nice and give me a premade solution to running the 2 trakpower lipos. Should keep the cg low, but the batts will be further out away from the center line. We shall see how this affects handling.

The trays look good in pics, I will most likely need to mod the motor mount, as it looks to be in the way of the tray. No worries, I will just trim the end off and radius what is left to clear the tray and be asthetically pleasing.

Only one issue, the battery trays are 70 bucks per side inc shipping. Kind of a smack to the nuts if you ask me. The good thing is that I just sold a few motors and a bunch of junk on ebay, so the money was there for these. They had better be nice, that is all I can say.

I plan to use a MM for esc duties, but I also have a mgm 90amp 4cell esc lying around. I will mount it directly opposite to the motor. We shall see. I really like the MM and have a spare now that the xxx-cr has a sidewinder in it. Not sure on the steering servo yet, need a 130oz or better and would prefer a digital. Time to find a good servo!

ouch and I thought it was bad when I bought one of there earlier designed trays. I think I paid $60, but I only needed one so it was okay.:neutral:

Ouch is right!

At least the rest of the equip was cheap. 100 bucks for the MM, 50 bucks for the motor, lipos were traded for some labor, as was the ccbec. I think I paid 170 for the hyper 7 roller, brnad new. Motor mount was 40 IIRC, And the rest was just hanging around.

Crap, I paid almost as much for the trays as I did for the mm AND the motor, and not far off the roller. Damn, at least it should look good when I am done.

Have not received the trays yet, but I did some work to the MM.

I decided to add a novak cap the the board where the main power leads attach. I left about 1.5 inches of wire on the cap so that i could mount it out of the way.

While i had the plastic case off I had a good look at the MM. Turns out that the heatsink was barely glued on! I removed it and the thermal glue residue. I then filed the bottom flat with a file and used some arctic silver thermal epoxy to hold it together. I used very little and made sure that I coversed the entire surface of the fets with a thin coating. It looks good now and the only light that can be seen is between the rows of fets from each end. I feel better that the heatsink is properly attached!

I will have to check my other MM escs and see how they are!

Update with Pics!
 

Got the battery trays in today and did some work to the motor mount.

I had to flip the motor mount upside down so that the motor would sit where the nitro engine would be. This was due to the fact that the battery trays overlap the chassis toward the center. Since the diff is offset to one side, the motor fit nicely on the other side. I had to cut a portion of the motor mount off and enlarge the thread on the bottom from m3 to m4. The diff sits higher now, and I had to mod the existing front bulk to get the bearing carrier holes level for the center diff.

I will have to make a new srevo tray and upper plate for the center diff bulks. I have some cf sheet that I will use for that. Looks like the MM will be across from the motor and the receiver will be across from the steering servo.

The battery trays did not come with the straps, those are emaxx battery straps. The al stap mounts were included, but no bolts or screws came with the trays. I eventually found that the small allen head screws that come with the associated battery cups had the correct thread (sae) and they have a hole drilled thru the head to accept a body clip to retain the straps. It would be nice if RC Product Designs would have included a note about that.

I need to scare up some diff gaskets, as it is too tight with the Kyosho plastic gear and the spider gears are binding. That should also space the center diff correctly in the bulks, as there is a bit of play right now.

Hopefully I can get those parts together quickly and finish this build!

Heres the pics:

http://i206.photobucket.com/albums/b...p/DSCF1871.jpg

http://i206.photobucket.com/albums/b...p/DSCF1872.jpg

looking good bro.
phil

So I got everything together and gave it a test run. Went well with the 13/46 gearing, plenty of power and the motor and esc got warm, but not hot. I would guess that it is running near or over 40mph.

Now for the bad part, I snapped the shaft, right where it is turned down to 1/8". That sucks.

However, I had my machinist friend take a look at it and he seemed to think that it could be fixed. So he gave me a section of steel bar that is slightly larger than 5mm. I will clamp that and the shaft into a v block and weld them back together. And then he will turn it back down to 5mm. I know that the hacker motor shafts are made of some really hard steel, hardened all the way thru. So hopefully my miller mig welder can weld the two materials together well.

I will take some pics tomorrow of the shaft before and after welding!

So I had a c50 L can motor laying around that I got cheap, due to the previous owner not knowing what wind it is. Threw it in the hyper with the mm and 4s worth of trakpower lipos. Tried a 14t pinion first. Wow, really fast, like 50mph! But it thernmalled the mm. So I stepped down to a 12t pinion, smallest that I can fit without modding the motor mount. Much better, plus I added a fan to the mm. Temps after 20min were 150 on the motor, 130 on the esc, and about 110 on the lipos.

This motor must be a 8l, so rpm is around 45k. Incredible power, especially from half throttle and up, usually when the slower turning motors are running out of power/torque. This motor just seems to build power the faster it spins. The temps suprised me, as I expected to cook something!

I will mod the motor mount so that I can fit a 10t pinion. That will be as small as I can go before the motor can hits the rear center driveshaft. I think an 11t pinion will be perfect for this combo, but want to be able to fit a 10 too.

The hyper really handles well, especially considering the weight.

I will post some pics of the current setup. I still need to move the servo so that the linkages are parallel, and make a cf servo plate.

Speaking of the servo, I am running a MG995 servo that cost $22 a pair! Great performance on 6v from the ubec, I would recommend this servo! For 11 bucks you cannot go wrong. Just as good as my hitec 645 and digital 5245.

Man....such a sweet looking rig. It does suck that the shaft broke.

Thanks, I tried to do a nice job on this buggy!

I will have the shaft welded up tomorrow and all should be ok when he turns is back to 5mm. Plus with the 5mm shaft it should not do this again! Hopefully!

I can't wait until Mike starts selling the diffs with the integrated slipper, that wil realy take some stress off the motor shaft!

Somewhat of an update. The lhs finally has my pinions, so I will pick them up tomorrow. I will have to mod the motor mount to get the motor closer to the center so that the mesh will be good.

Otherwise everything else seems to be working fine. I ran a full pack thru it and it was ridiculous, a bit too fast for my bashing area. Got decent runtime and the temps were ok, would like to see them slightly lower, so the 11t pinion will most likely be the best bet.

I also picked up another hyper 7, this one has the pivot ball front suspension. It also has the complete rcproducts design kit, with the trays, motor mount, etc. I have a 8xl and a mtroniks truck esc to try out in it. That may be for sale soon, how knows.

I will post pics and info when I get everything back together, hope I have time tomorrow.

The RCP conversion for the Hyper is actually very nice. I like the balance of saddle packs and if you wanted to get crazy you have room to dump some big lipos in. I like the way you flipped the motor, that makes sense. if you can't scare up any dif gaskets, drop me a line. I could toss some in an envelope. I am sure I have a few kicking around. what's a buck for an envelope... Weight is not always a bad thing, especially when you make contact with another buggy hehe

I picked up an Xray, and a Jammin tonight to play with next. I won't count the Ofna Ultra in the box, it's a tank that will be sold as a parts car to someone lol.

Those are some sweet lookin' battery trays and your conversion is very clean, lincpimp. I also converted a Hyper 7; check mine out.

Subscribe: I too have a Hyper-7 to convert! Watching this build closely. Still looking for finished pics showing your servo configuration. Why wouldn’t the stock servo plate work again? Do the RCP trays interfere with the stock mounting?

Looks good, nice conversion!

The RCP trays take up 1 hole that the stock standoff mounts to. Look at the pic on the rcp site and you will see what the servo mount needs to look like.

Ok, snagged a pinion for this project to gear it down a bit. Only dropping 1 tooth, but that should be perfect. I will have to remove the mount, and make the slots slightly longer so that I can ge the smaller pinion to mesh correctly.