I'm starting this thread to help me gather the information about maules and I figured someone else might find it useful. Mostly M5 and M6. Not looking for a debate about different types, only putting together information I find useful. As I continue to research and have something to add I will update this original post.

Useful loads are guesses I made based upon a bunch of googling, the are probably inaccurate. If I find better numbers I will post them.

If you see incorrect info let me know. If you have something USEFUL to add post it.

I'm looking for a plane with a 1100 pound useful load (I realize the maule is more like a 1000 pound useful and that is if kept light), can burn mogas (a must), and has the option for a 3rd row of seating.

M5

Mogas STC available from Petersen available for both the 0-540-B4B5 and the 0-360-C1F according to http://www.autofuelstc.com

Mod kit #8 installs 5th in the rear of the cabin. http://mauleairinc.com/pdf/modification_kit_index.pdf

Gross weight 2300lbs. Only going to get about ~900# useful...maybe.
Service Letter 43 raises the gross weight of the M5-235C to 2500lbs and raises the M5-180 to 2400lbs.

Universal wing won't fit on the M5 without some fuselage mods.

M6

Mogas STC available from Petersen available for both the 0-540-B4B5 and the 0-360-C1F according to http://www.autofuelstc.com

5th seat was an option on all M6s. There is some concern about CG problems with the 5th seat and the lighter 180hp engine but it sound like that can be dealt with. The battery is under the copilot seat on the M6 but it can be moved to the firewall.

Gross weight for the M6-235 is 2500lbs. Probably can see close to 950lbs useful.
Gross weight for the M6-180 is 2500lbs (TCSD is wrong). Probably ~1000lbs useful. There are some 1050lbs useful planes out there.

Mod Kit #22 modifies the M6-180 to a MX7-180B (2500lbs gross and approved for 5th seat). Not yet sure if the M6-180 actually becomes a MX7-180B in the eyes of the FAA, will call Jeremy and find out. This is a moot point as the M6-180 already has 2500lbs and the 5th seat is approved for all M6.

Droop tip M6 wing was a little weak in aileron authority so they made the ailerons 3.375 inches longer (51 1/4" vs 54 5/8") and ditched the droop tips. This became know and the square tip M6 wing or new M6 wing.

Universal wing fits and is approved on the M6.

Universal wing (32'11" span with 60" ailerons) was used on the M7 after 1993. It is the preferred wing from what I can tell.

The Uni wing is the 32'11'" used after 93 I think the "A" Long wing is 33'8" Having done the M5 to M6 conversion it is a chore but doable and worth it if you like your bird and don't want to buy another... Also nice time to install skylight and other mods if you don't already have.

Be careful on the Mogas compatability with the O-540. I have the O-540-J1A50 which is not listed with Peterson. The later models of M7's have an O-540-B### engine are listed and do have the mogas STC. I don't know about any others. I would like to have the option....

the b4b5 is the low comp that you can use the mo gas..

HS is right. I guess I should have stated that, will update.

Auto gas STCs are also available from EAA.

O-540 included are:O-540-B1A5, -B1B5, -B1D5, -B2A5, -B2B5, -B2C5, -B4A5, -B4B5
http://www.eaa.org/autofuel/autogas/approved.asp

The B4B5 is the only one in the Maule I think.... correct me if I am wrong...

Don't know for sure but EAA website says Maule M-4, Most Models.

You would need to contact EAA to be sure.

no auto gas STC for the Cont IO 360...

Was just gonna ask the same thing iceman.
Mauleflight.com has all the M5s listed as 2500 gross, except the 180 which is 2400. I'd like to know whos right as I am also looking around and there is some nice M5s out there...

iceman wrote:no auto gas STC for the Cont IO 360...

anybody know why no autofuel STC for this engine? (I have this one on my 170B)

You might want to look at weight and balance with the 5th seat option. The 180 hp is a little tail heavy. If you're going to put a human back there it's going to have to be a homunculus. The extra 100+ pounds hanging off the nose of the 235 hp version gives you more baggage/5th seat loading options.

The Maule mogas STC, at least on my 180 hp version, is more than just a sticker. Last I looked it was going to be about $1500 to do the mod. Required a different fuel pump and a new vent that ducted air onto the pump.

Mr. Ed

I wonder, really, how long alcohol free MO-Gas will be available. It isn't available where I live as it is. To base one's choice of airplane on it's ability to use a fuel that is unlikely to be available shortly seems to me to be wishful thinking. Perhaps I'm out of the loop on this score....

EB

I hear what you are saying EB. Where I live E0 is easy to get. Multiple stations of different brands have it, mostly for the snowmobile community. A guy I know who owns a couple stations said he will carry it even if he has to order the clear 88 octane used to make E10 91; that's what he had to do last year.

Good to know that the 180hp version is a little tail heavy...that is defiantly something to consider. Even if I don't have a child in the back seat my 100# dog will be back there.

A1Skinner wrote:Was just gonna ask the same thing iceman.
Mauleflight.com has all the M5s listed as 2500 gross, except the 180 which is 2400. I'd like to know whos right as I am also looking around and there is some nice M5s out there...

M5-235C can be modified to 2500gross. Haven't figured out the M5-180 yet...type certificate lists it at 2300 and I haven't found a mod kit or service letter yet.

https://fdb41ebf-dcb9-418b-8328-810edcf ... ee1cb2.pdf

https://mauleak.com/chronology.html


Here are 2 thing that will help with info you are looking for...

c170pete wrote:

iceman wrote:no auto gas STC for the Cont IO 360...

anybody know why no autofuel STC for this engine? (I have this one on my 170B)

I suspect that it's due to the possibility/probability of vapor lock in the fuel delivery system, which is more likely in a fuel injected engine with the injectors and spider above the cylinders.

MTV

Mogas STC is only available on Lyc O360 C1F and C4F and O540 B4B5 engined Maules.
It requires ducting to gascolator and engine fuel pump.
It also requires removal of Dukes pump and fitting of 2 parallel Facet fuel pumps and apropriate breakers and switches.
It also requires placards and STC paperwork from Petersen and Maule.

whee wrote:Good to know that the 180hp version is a little tail heavy...that is defiantly something to consider. Even if I don't have a child in the back seat my 100# dog will be back there.

Hanging a big CS 3-blade AL prop up there could help to offset that problem a little bit?
(albeit akin to introducing lions to control your tiger problem....)

A question to any Maule guy who can answer this: Are the takeoff roll numbers accurate for 1 person 1/2 fuel in this performance spec sheet? Seems impossible!!!! (Not saying it is, but if it is true that's impressive. 150ft!!!)

http://www.mauleflight.com//M5.html