Aprilia MXV 450 : Motocross full carbon project completed.

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Aprilia MXV 450 : Motocross full carbon project completed.

Author	Message
morepower	morepower posted 8 Years Ago Post Details
Group: Forum Members Posts: 242, Visits: 1.2K	Good work so far.. The subframe would be my only worry. I made a one piece fuel tank and monocoque seat unit for an Aprilia RS250. It is very strong but not sure about shock loads from impacts being sustainable. I would look at making it overkill and adding a core to add some extra stiffness and possibly get a simple alloy subframe made to embed into the part when you make it. It will have a hard life and as you only have limited experience with composites there is a temptation to make it too light you should look at ways of making sure it will be strong enough.
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Dravis	Dravis posted 8 Years Ago HOT Post Details
Group: Forum Members Posts: 592, Visits: 1.9K	regarding the 4 mounting points for the frame mounting, I would have some machined, in a shape that distributes the load out onto the flat sides you are adding to the frame in Carbon. Consider welding alu- "eyelets" on to flat pieces of aluminium .. Also, I would certainly make this as a sandwich with either Soric or 3D core -- You can then "overengineer" without adding too much unneeded weight - I would also consider adding at least one layer of Kevlar /CF mix cloth in the "stack" Just to make sure of keeping even a broken subframe mostly in one piece "Sapere Aude"... Dare to KNOW! The written word is the only truly efficient vehicle for transmitting a complex concept from mind to mind... 103% of all people do not understand statistics... Do not adjust our mind, theres a fault in reality :-)
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Thanasis	Thanasis posted 8 Years Ago HOT Post Details
Group: Forum Members Posts: 36, Visits: 234	@ morepower Thank you for your advices and conserns. This is my main concern also, to make it as strong as I possible can. Weight is not a matter at all this time, the aluminium subframe weights 1.4 kg which is already very light for my beliefs. The first part could be a lot heavier than the original one, but I don't care at all : ) Also I know that this project could be a little bit out of my abilities and qualifications, but I would like to give it a try even if I fail. The problem is that the motocross use is really very hard on every part of the bike and all the parts (even the frame) should considered disposable at a given time.
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Thanasis	Thanasis posted 8 Years Ago HOT Post Details
Group: Forum Members Posts: 36, Visits: 234	Dravis (15/12/2016) regarding the 4 mounting points for the frame mounting, I would have some machined, in a shape that distributes the load out onto the flat sides you are adding to the frame in Carbon. Consider welding alu- "eyelets" on to flat pieces of aluminium .. Also, I would certainly make this as a sandwich with either Soric or 3D core -- You can then "overengineer" without adding too much unneeded weight - I would also consider adding at least one layer of Kevlar /CF mix cloth in the "stack" Just to make sure of keeping even a broken subframe mostly in one piece Thank you for your valuable advice. I am thinking something like this for the 4 mounting points, 2 semi-bushings sliding into each other : I have plenty of soric that I have used it only to add more thickness in some small areas of some parts I have already made. So I am already detirmined to use it in full scale for the subframe. I have never use kevlar or mix fabric (except a carbon/titanium wire fabric once). But it is a very good idea and I will follow it. Any recomentation for the fabric stack? In some places it has to be extra thick in order to meet the mounting points of frame.
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davro	davro posted 8 Years Ago Post Details
Group: Forum Members Posts: 300, Visits: 2.2K	Nice work! You have done really well with the moulding of some challenging shapes David Stevens YouTube: Comment \| Rate \| Subscribe Instagram Composite Projects Body Package for Dax Rush RC Car Touring Body 1/10 Scale
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Thomb	Thomb posted 8 Years Ago Post Details
Group: Forum Members Posts: 23, Visits: 656	nice job mate! had a mxv too too bad i sold it
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Thanasis	Thanasis posted 8 Years Ago Post Details
Group: Forum Members Posts: 36, Visits: 234	Thomb (20/12/2016) nice job mate! had a mxv too too bad i sold it Oh no, MXVs are not mend to be sold!
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Thanasis	Thanasis posted 7 Years Ago HOT Post Details
Group: Forum Members Posts: 36, Visits: 234	So I found finally some time to finish the mould. It is ready to go!
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Thomb	Thomb posted 7 Years Ago HOT Post Details
Group: Forum Members Posts: 23, Visits: 656	looks great, any pics of how you make the mould edges of the parts with the plastic?
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Thanasis	Thanasis posted 7 Years Ago Post Details
Group: Forum Members Posts: 36, Visits: 234	Thomb (28/01/2017) looks great, any pics of how you make the mould edges of the parts with the plastic? It is simple: all the barriers of the moulds are made with 'polypropylene fluted signboard' that is glued behind the plastic parts with hot glue. I have keep only this photo : Then you can joint the pieces with release tape (green tape) and the voids with filleting wax (yellow material).
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