G'Day, I'm one of those new kids - building one of those fandangle multicopters that are all the rage these days ;)

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SpamIsHam

Active Member
Joined
Jul 5, 2022
Messages
31
Location
Sydney
Hi All,

Obligitory intro post - I'm SpamIsHamInACan, I'm 40 going on 15 and from Australia.

My previous experience with aircraft building has all been on my collection of "modern" military aircraft, in particular their cockpits. I currently have 2 F-111 cockpit/crew modules, an E and an EF and a complete forward fuselage section that I have spec'd as a C. I also have an F-16 forward fuselage section that is a never ending work in progress (just when I think its perfect, I think of something else to do to it and pull it all apart again lol). None of these are flyers of course, just done for static display.

I have a PC-9/A that I am working on as a very slow, casual and relaxed restoration that I am in no rush to complete, which will eventually be a flyer.

I also have a number of spare parts surplus to my needs for the PC-9 that I will put in the for sale section here just because why not ;)

My reason for joining here today is for my other project, which I am about to really start focusing on now.

I've accepted that I don't have the required skills or patience or area or time or knowledge to scratch build a helicopter or even a plane... putting something together from pieces yes, scratch building - not my strength i'm afraid.

Having a fairly decent grasp on quadcopters and having been flying them for nearly 8 years now, as well as scratch building some of the more complex ones just for shits and giggles, I have decided to combine two assets I can bring to the table and build a man carrying quad.

You can read more about this in my soon to be started build thread :)

Remember kids, don't say HAM, say SPAM - Spam Is Ham In A Can ;)
 

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Tiger Tim

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Joined
Apr 26, 2013
Messages
4,703
Location
Thunder Bay
Welcome to the forum.

Your project sounds interesting. Will it be a true quad or some other sort of multi copter? Also what kind of endurance are you hoping to see at this point?
 

SpamIsHam

Active Member
Joined
Jul 5, 2022
Messages
31
Location
Sydney
Welcome to the forum.

Your project sounds interesting. Will it be a true quad or some other sort of multi copter? Also what kind of endurance are you hoping to see at this point?


Well, here is what might be quite controversial... its basically going to be a clone of a Jetson One...

Almost every part of those are "off the shelf" and available for anyone to buy - and provided you have the programming skills, I see very little reason why you couldn't build your own for a bit over half the price they are asking, with a 2-3 year waiting list.

I'll save the full details for my official build thread, which I'm putting together now, but in answer to your question - its a 4 arm setup, with stacked counter rotating props one over one under.

So 8 motors all up.

20mins + 7mins reserve is realistic with the currently available battery, however solid state batteries that are due out later this year should double that to 40mins.
 

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challenger_II

Well-Known Member
Joined
Jul 15, 2009
Messages
1,084
Location
Fisher County, Tx. USA
Being a "belt and suspendies" kind of guy, if multi-rotor is your game, I would highly recommend a "double sexto" rig. 6 rotors gives more area coverage, and having them paired (one up, one down) gives redundancy in the event of a motor failure. Ensure the drive systems are separate circuits and controllers, yet linked to the (paired, redundant) esc's and batteries.
 

SpamIsHam

Active Member
Joined
Jul 5, 2022
Messages
31
Location
Sydney
Being a "belt and suspendies" kind of guy, if multi-rotor is your game, I would highly recommend a "double sexto" rig. 6 rotors gives more area coverage, and having them paired (one up, one down) gives redundancy in the event of a motor failure. Ensure the drive systems are separate circuits and controllers, yet linked to the (paired, redundant) esc's and batteries.

I have been considering this - my build is a blatant copy of the Jetson One design, which is a quad configuration with 8 blades (up and under). However, having those 4 extra motors by making it a 6 arm configuration does make a MASSIVE difference in lifting power and provide that extra available margin for safety options on an engine out scenario.

However, there are disadvantages to this configuration too - the extra weight of the batteries required comes at a massive penalty, the extra size footprint of the machine makes it look well... a bit silly.... less is more kind of thing...

Also, on the subject, I'm trying to imagine a scenario where just one engine fails?

Its far more likely that it would fail due to an electrical fault or battery failure and that would affect more than one motor..
 

Skypilot053

Member
Joined
Nov 8, 2021
Messages
16
I agree probability of multiple engine out due to controllers or battery system failure is higher than a motor problem so for 20lbs add a ballistic chute should address safety concern
 
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