Will the GP3700's fit the FK05

[Mark Payne]

Anyone know?

[Joost van Leeuwen]

Anyone know?
They will.

[Genem]

Most companies are making it a point to support the newer larger batteries. And even if they don't, you can just sand the slots to allow a better fit.

[al]

Fk'05 chassis was made to fit the larger 3700s......

[Mark Payne]

Hi

Having made it now I can confirm that 3700's do not fit the FK05 correctly.

The chassis is cut for 3300's and is way out for 3700. I filed the chassis from the centre cell pair, working out towards the ends. I allow the cells to sit down a little further in the chassis also.

In doing this I also had to modify the front, back and side cell stops. Its a bit of work but worth it.

Cheers

Mark

[Joost van Leeuwen]

Used mine today, no problem at all. Fits like a glove.

Do you have extra shrink wrap around the cells? To protect the matchlabel maybe? (I do not)

[Sam_Smith]

Same, me and my mate are both using 3700's in our FK05 without a problem or any mod's to the car.

[Mark Payne]

Used mine today, no problem at all. Fits like a glove.

Do you have extra shrink wrap around the cells? To protect the matchlabel maybe? (I do not)

Hi Joost,

No extra wrap, these are Peak's.

I am not saying that the 3700's will not "go in". They will.

However: If you lay the individual cells (unsoldered) on the chassis, they are cramped. The outer cells rest on the outer edge of the chassis slot only. The next cell in prevents it from touching down on both sides of the slot. If you then push down on the outer cell so that it does touch down correctly, it pushes the next cell in up and out of the way.

The errors here are small and in mm's only. I appreciate that not all will see it unless you look in detail. The chassis slot centres are based on 3300 cells, not 3700's, end of story, a ruler and a set of calipers tell you that...... unless Xray have changed it and some have 3300 versions and some have 3700?

If you then try to do a little chassis chamfer to sit the cells down in the solts a little then the problems become slightly worse also.

I like the chassis to form a jig for my cells. I then glue the pack up on the chassis before I solder them up. 100% perfect cell alignment every time.

Now when you tape these in you can use minimal pressure on the tape so as not to tweak the chassis which is the whole point of the tape is it not?

Someone said they fit like a glove....... hmmmm. Look again.

I would estimate that 3700's are going to sit 1mm high (compared to 3300) if you just plonk them and my 3700's with a bit of chassis filing sit 1mm lower.
That's a 2mm difference between "doing it right" and "plonking them in". Based on the fact that one major FK05 design feature to get the COG down
what is the point of not correcting this issue?

So measure the slot centres, measure the cells and have a think about it. The Xray build is a piece of precision ... the cell fitting by default is not.

Cheers

Mark

[al]

The car was designed to fit the bigger 3700s aparently, so i can't see how it would be a problem...

[stuartb]

Just to say that mine also dont fit in. I have 3700's from Doom and they dont appear to have any extra shrink on.

[Sam_Smith]

TBH looking at it how Mark is they don't fit 'perfectly' and they do sit high on the plastic blocks. but they dont come out so :p lol

[Andrew_Carter]

You carnt say that 3700s dont fit in the FKO5.The designer of the car,Juraj Hudy posted on the Xray fourm and said the car is desgined for 3700s!

I dont fink anyone can argue with him! After all hes only designed the best TC on the market! ;)

[Mark Payne]

Andrew... did you make the measurements I was refering to?

No?

Here you go then......

3700 dia = 23mm
3300 dia = 22.6mm
Distance between chassis slot centres = 22.6mm

The chassis is set for 3300's Guru Juraj or no Guru Jurai

.... are we going to go round and round in circles or what? I started the thread question and got the wrong answer. Now I am giving the right one.

Get your file out.

Mark


You carnt say that 3700s dont fit in the FKO5.The designer of the car,Juraj Hudy posted on the Xray fourm and said the car is desgined for 3700s!

I dont fink anyone can argue with him! After all hes only designed the best TC on the market! ;)

[Andrew_Carter]

Didnt even bother reading all that mate,they fit and thats the last of It! I have 8 packs of GP 3700 and they fit! END OF!

PUT UR FILE AWAY!

[al]

I think someone got told to sit down :D

[Mark Payne]

Oh yes ... my mistake.

I'm being way too pickey......

Having looked at it again, a 6 cell 3700 pack also fits my 1/12 scale just fine also. Looks fine to me (http://www.soundfoundation.com/mark/Cells.JPG)

Mark

[al]

Bit off to the left, To Be Honest

[STEPHEN E]

Didnt even bother reading all that mate,they fit and thats the last of It! I have 8 packs of GP 3700 and they fit! END OF!

PUT UR FILE AWAY!

How does this sort of thing help anyone.
If your going to reply to someone at least read what they have to say.

[Mark Payne]

TBH looking at it how Mark is they don't fit 'perfectly' and they do sit high on the plastic blocks. but they dont come out so :p lol

Hi Sam,


What I would be worried about is the fact that all but the end cells are unsupported. This will eventually stress the battery bars and you are more likely to have a pack fail.

Cheers

Mark

[xraydad]

Apparently not Mark, as this is a team driver's response to Daves question on the Xray forum -
"Dave, I checked and you are correct, the current chassis is still based on 3300 measurements. Mario is preparing some instructions on how to modify the chassis to cope with the 3700s. The chassis is also being redesigned for 3700s but unfortunately that won't help you right now."
Watch this space?
Phil

[axpayne]

Hi Folks,

I am a non-Xray owner (Corally RDx owner) and not related to Mark Payne.

Having read this thread and recently attempted to fit 3700 in my corally, the title is my conclusion.

Clearly as people have stated they DO fit in the car, but assuming Mark's measurements are correct (I have no reason to doubt him), a pack is about 2.4mm longer, so the fit will NOT be perfect.

The corally uses a brace and not tape to hold the cells in, so I spent a while last night grinding the posts down to stop the cells forcing the posts apart. This might be why the FK05 uses tape.

The other point to consider is that a number of racers are still likely to continue with 3300 or similar smaller cells. If the FK05 perfectly accommodates 3700, what would the affect be on using 3300. Being slightly smaller they might sit lower than the bottom of the chassis and be prone to damage.

Andrew Payne

[university_dave]

Apparently not Mark, as this is a team driver's response to Daves question on the Xray forum -
"Dave, I checked and you are correct, the current chassis is still based on 3300 measurements. Mario is preparing some instructions on how to modify the chassis to cope with the 3700s. The chassis is also being redesigned for 3700s but unfortunately that won't help you right now."
Watch this space?
Phil

Given that the Nosram 3700s are the same size as 3300s you can sidestep the problem somewhat.

[al]

But nosram 3700 aint as good as the Gp's :)

[university_dave]

But nosram 3700 aint as good as the Gp's :)

There's no pleasing some people is there... ;)

[ldebackker]

this is information I got from someone from a shop:


Diameter:
3300 = 22,75 mm
3700 = 22,95 mm

Will the 2 tenths of a mm. really make a big difference? I'm wondering because I want to buy 3700's for my T1R, which is obviously not designed for the bigger 3700 cells.
The same guy who gave me the diameters, also told me that the cells won't fit in the T1R. but there are also people with an FK05, who say that the 3700's fit just fine in their chassis, without filing, while the FK05 is (like the T1R) not made for 3700's...

so, what I'm thinking, for me it doesn't matter if they don't fit perfect and the CG is .5 mm. higher with these cells. the things that matters is, can they be strapped in without or with little filing?

so can anyone maybe post a picture of his car with 3300's and with 3700's? then I can see the difference. and everybody following this topic can finally see how the cells fit. :)

[Mark Payne]

I gave the actual diameters of Orion GP 3300's and Peak 3700's a few posts back.

Some people seem to think I am making this stuff up?

Two posters owe me an appology .... I'm not bothered either way.....

The difference is 0.4mm per cell. That is about 1.5mm for a pack of three in one side of your T1R. I have played with the plastic chassis and from what I remember 3300's were tight.

I think you will strugge to get these in without modification. But then what do I know?

Mark

[Firestorm]

To an Engineer such as you or I, Mark, 2mm difference over a pack is an awful lot. But hey, if these other boys want to 'stuff' their precious cells in, then let them. :) :) :)



Frank.