ARC Jupiter
 

Currently putting together a ARC Jupiter kit ive looked over all the steps for construction & there isnt a single picture or any mention on where to mount the engine. Has anyone built this kit or have an idea where on the mount the engine should be?

RE: ARC Jupiter
 

I'd put it up front somewhere. :D

Sorry, couldn't resist being the first to say that. I'll do some research and see what I can find.

RE: ARC Jupiter
 

:eek:

Man, there's got to be one in every crowd!!! :D:D

I don't have any experience with this plane. Does this come with the engine mounts with the plane, or do you have to provide those yourself? Is the firewall pre-drilled for an engine mount? Does the firewall have a center mark on it (usually an "+" shape on the front to of the firewall). I'm asking these questions to hopefully get some info to try and help you out here.

Ken

RE: ARC Jupiter
 

Sorry again for the above. Is the plane the one listed in this page?
http://www.hobbyhorse.com/falcon_kits.shtml

Is ARC the brand name or does it stand for "Almost Ready to Cover"?

You have not given much to work with.

Ken's question about the cross on the firewall is excellent though. It would indicate the thrust centerline if it is there. May be hard to see, so look closely. If it is there, you could determine the mount locations.

RE: ARC Jupiter
 

Hey guys the model is made by ARC Modelfly sorry for not including the full title. Right the whole plane is made of some kind of plastic not sure what? The firewall doesn't have a + on it. There was 3 dimples which you drill through for the mounting screws. There is a motor mount ring which is glued on the opposite side of the firewall it has 3 nuts on it which line up with the holes i previously drilled. there is a engine mount which came with the kit this also has the 3 holes so the whole assembly secures together with 3 bolts which fasten through the motor mount ring on the inside of the fuse. The engine mount can only be mounted 1 way due to the large hole cut in the right handside of the fuse for the engine to stick out. so its just a case of figuring out how far along the mount do i position the engine. Ofcourse the spinner has to clear the opening but how much of a gap should it be? The instructions for the kit are not the best in the world the pics are way to small can't figure out what half of them are.

RE: ARC Jupiter
 

A gap of 1/16-1/8 INCH would be fine.

If this has a "clamp type" mount:
1- try to assemble to motor/prop/spinner assy and slide it into place. May need to assemble in place in some a/c.
2- Loosely install the clamps so the engine can slide a bit.
3- position the engine assy for desired clearance.
4- tighten screws in clamps

If not clamp type, do steps 1 & 3. Then mark where holes need to be drilled. Remove motor and drill holes. Mount engine.

You can usually leave the muffler off until last but not always

RE: ARC Jupiter
 

Thanks bruce will do what you say. Never had a kit yet that hasn't explained the mounting position of the engine. Im sure i will in time know how to position it without instructions, still learning at the moment. oh ive just had another thought the instructions say the C of G is between 85-90mm from the leading edge of the wing but where exactly on the wing is that ? They dont specify a particular part of the wing for example on a P-51 the balace point is normally behind where wing leading edge angles. Should the wing have a specified CofG point ? there isn't even a pic of where it should be located? Gets quite frustrating concidering this is supposed to be a beginner/intermediate kit.

RE: ARC Jupiter
 

AAC --- That question about the engine mount was a real good one ( I think ). I've assembled about 6 of the Jupiters and NEVER even noticed that they didn't explain in detail how to mount the engine. Iv'e done all their planes and it's not on any of them.

On mine ( OS 46 ) the front
ear of the engine sets back from the front of the mount just under 1/4 inch, that puts the ears of the engine about center in the mount and leaves about 3/8 inch from the nose of the cowl to the back of the prop. That also leaves enough room to get the fuel lines out from behind the engine.

As far as the CG goes: measure the 85 - 90 mm back from the wing leading edge at the fuseledge and you should be good, that's where all mine were measured. If you are new to flying I suggest you stick close to the 85 now and maybe shift it back when you get some stick time on it. This plane can be very Aerobatic if you want it to but it can also be pretty forgiving, they are neat planes and I've ENJOYED them for years.

By the way they are made out of a special formulated ABS plastic that makes the material soft and some what plyable keeping them from cracking etc. like some of the older plastic planes did. With CARE you can reform some areas with a heat gun but you have to be REAL CAREFULL with the heat.

I hope this helps and I'm sure you will ENJOY your Jupiter as much as I have all of mine. ENJOY !!! RED

RE: ARC Jupiter
 

I've never seen a Jupiter in person but from the picture it looks like a straight wing (no sweep) so it doesn't really matter where you measure the CG from along the wing. It will be physically easiest right next to the fuselage as suggested by Red Head. Most of the members seem to agree that low wing planes should be balanced inverted (unless the manual says otherwise) and I have a hunch the manual has little to say about this either. I usually just put a piece of tape on the wing in the approx correct area. Measure and mark the tape with the correct point and then suspend the plane on the balancing points. Balance by moving receiver and/or battery as first options before adding additional weights.
I also agree on the 85mm. A tail heavy plane can be a real hand full to fly.

Good luck.

RE: ARC Jupiter
 

Hey Red not sure if you still the jupiter or the instructions for it but i seem to have 2 little plastic nipples left over for the kit. They are identified by the letter V on the molded part there is no mention anywhere in the instructions what they are for? Did you find a use for them?

RE: ARC Jupiter
 

On the ready2 trainer the two plastic nipples are used to fill the holes drilled to allow the undercarriage legs to be screwed to the bulkhead. The undercarriage is the same on the Jupiter and I presume that the hole drilling exercise is the same on this model. Hope this helps.

RE: ARC Jupiter
 

So they are to keep fuel/oil out of the interior?

RE: ARC Jupiter
 

I guess so, plus grass, mud/dust and so on. However, given that the suspension legs can (and often do) snap, it would be unwise to glue these nipples in place too effectively!

RE: ARC Jupiter
 

AAC --- I'm sorry but I don't remember any nipple types with a V on them and I just looked in my junk box and there aren't any there. I took a quick look at the plans but didn't see anything, will look further if I get a chance.
I do have some little dome types with a short leg off the bottom of the dome and those were for the early Ready's and were probably just left on the mold block. They were for the holes in the wing tips and could be painted so they gave the impression of wing tip lights. The Jupiter didn't have them but they were on the mold block.

Checkmate -- I don't have the Ready 11 but the only change was in the trim from the original except possibly that they didn't have the holes in the wing anymore ( Ready & Jupiter -- same wing just a different center section ). On the Ready when you drill the holes to screw the landing gear on you DON'T plug the holes, they stay open for access to the gear with that nice long screw driver they gave you. The Jupiter uses a different system. It has 3 bolts going into the mount and gets tightened with allen wrenches, the Beaver also uses allen bolts.

Bruce --- See the comment for Checkmate

Hope this helped but I don't know how !!! I can't do pictures but if you can I might remember seeing them. ENJOY !!! RED

RE: ARC Jupiter
 

Thanks red i'll just leave the nipples out :D couldnt resist hehe ive checked the model over & there is nowhere they could go, maybe they are left over from the mold. I test fit the wing today & tightened up the plastic bolt as tight as it would go but i still seem to get some play either way with the wing, this will cause me probs when trying to check alignment of the elevator with the wing tips [&o] looked everywhere for a steel bolt as the plastic one is fast loosing its thread but no look hmm i'll just leave it & hope it sorts itself.

RE: ARC Jupiter
 

AAC --- you shouldn't need a metal bolt for your wing, I've been using the nylon bolt that comes with the plane for years. I did replace the one I have now as I had used it a LONG time and it was getting hard to tighten. You may have to tighten it a few times and maybe even reef on it a bit. I sometimes think I'm tightening it to much but in about 8 years I've never broke one ( except on a hard ground loop when the wind got the Ready ).
I have a coin that fits the slot of the bolt that I filed flat on one side that I use to tighten mine. If you can find a Canadian quarter they work great and just go along with your change in the pocket. Just don't try to buy anything with it, the stores have NO sence of humor for some reason.
When you get really comfortable with the plane get back to me and I'll tell you how to Have some real fun with it, but not till you are REAL comfortable with it.
Another little hint I forgot about : I don't know if you SCORED all your glue areas or not I hope so but anyway -- On your landing gear bulkhead -- go back in and run some more medium CA all along the mount edges. They have a tendency to loosen up after a while. I've had to go back and reglue one. Not from hard landings, just rough ground --- --- and if you believe that I've got a couple bridges I'd like to sell you. ( ha ha ) Hope this helps and keep us informed how you are doing. ENJOY !!! RED

RE: ARC Jupiter
 

hi just orderd a jupiter its my first low wing i was wondering if my thunder tiger gp 42 would power it ,i have got a irvine 53 but i think that would be to fast for my first flights prob end up in a tree (only been flying gas 1 month) :D

RE: ARC Jupiter
 

The 42 should fly it fine especially for some one new. ENJOY !!! RED

RE: ARC Jupiter
 

thanks for that red one more question what prop size should i use for my gp42 and irvine 53 on this plane:)

RE: ARC Jupiter
 

On the 42 I'd lean toward a 10 X6 or 10 X 5 And on the 53 I'd start with an 11 X 6 or 11 X 5. These would just be starting points as you will probably want to experiment a bit to see which you like best. ENJOY !!! RED

RE: ARC Jupiter
 

hello again just puting the jupiter together, there is no bar through the wings to strenthen them is this correct,is there no support for the fuel tank eather apart from packing it full of sponge..will the plane move left and right when taxing with out the tail wheel moveing.thanks for the help [img][/img]

RE: ARC Jupiter
 

SIDAV :
1. There is no bar for the wing. Once the 2 halves are glued (epoxy ) togeather inside the wing joiner it will be super strong. Suggestion : make sure you SCORE all parts to be glued, it gives a better grip for the glue.

2. The rubber gromet on the front of the tank is supposed to fit tight enough that you don't need a support, I still do something like the foam or what ever. I use Styrofoam blocks in some cases, it's light and easy to work with.

3. I don't really understand what you mean by the plane moving left and right without the tail wheel moving ????
RE READ your instructions and REALLY look at the pictures. Your tail wheel steering is controled by linkage off your rudder servo. see pictures # 56, 57 and 60 . Make sure when you pin the tail wheel that you don't squeese the tail wheel mount to tight. ENJOY !!! RED

RE: ARC Jupiter
 

I think i know the parts your talking about, if your not using a fuel valve and have a fuel filler pipe to the tank they are used to plug the pipe so the tank can be pressurised, they provide 2 so you have a spare

RE: ARC Jupiter
 

I have flown most of the arc range and the 42 might be a little under powered i personally would go for the irvine, you don;t need to use full throttle

RE: ARC Jupiter
 

I agree with red, don;t use a metal bolt on your wings, if you do it makes a hell of a mess if you are unlucky enough to start doing ground aerobatics, don;t worry to much these planes do fly very nicely