A 125mm quad designed for 3" props and 1104-1407 sized motors. With a  2mm baseplate, this quad is a difficult build and is nothing more than an avionics/video stack and fast-moving props on a durable platform. Strap up a 4s battery and go for a rocket ride.

The Dirk is a plus-configuration quad designed to go faaaast. With a minimal frontal cross-section and the battery sharing drag with the front and rear arms, it looks like a speeding dagger in the air. This version has a 5mm base plate for maximum durability, but still <100g weight with standoffs and hardware.

http://www.bowtiemultirotors.com/#!dirk/gvree

The Dirk is a plus-configuration quad designed to go faaaast. With a minimal frontal cross-section and the battery sharing drag with the front and rear arms, it looks like a speeding dagger in the air. This version has a 4mm base plate for lighter weight, only 61 grams including hardware and spacers!
 

Check out the Dirk on Bowtie Multirotors website for more info.

http://www.bowtiemultirotors.com/#!dirk/gvree

The Mad Hatter is an incredibly compact build, with arms that narrow in the middle, where the stresses are lower, for minimal thrust blockage. With the some care, the Hatter can be built with only 25mm between the center plates and camera deck--an ultra-compact profile for mass centralization. The arm attachement profile forms the "Cumberbund of Strength"...a continuous perimeter of 4+2+2mm sandwich of high quality carbon fiber.  A minimal cross-section and low weight make this a great racing quad, with a quick 3-bolt changeout if you manage to break an arm (spare included!) At 186mm and <80 grams with hardware, the 5" Hatter is agile enough to let your thumbs and imagination be the limit.

Check out the RCGroups thread at: http://www.rcgroups.com/forums/showthread.php?t=2659784

NOTE!!!  Armattan Productions does not carry the 2x 28mm standoffs and 4x flat M3 nuts required for the "hat" of the Mad Hatter. However, Armattan Quads (sister site and same company) *does* carry the standoffs, at http://www.armattanquads.com/28mm-black-anodized-aluminium-standoff-5-5mm-o-d/, and the nuts are available at most hardware stores and countless online vendors. I have reduced the Mad Hatter kit price (compared to my US site) by $6.80 to reflect the cost of the standoffs and their $5 shipping to anywhere in the world. If you order this "Mad Hatter 186mm -- Separate 28mm Standoff Purchase" kit, you must purchase those two standoffs separately. My apologies for the inconvenience, but this is the best way to provide reasonable shipping and service to international customers (I am based in the US.)

The Nutzo is a battery-centered design, fitting a 4s 1300-1500mah battery right in the prop plane. With the camera gear above and most of the frame weight below, the Nutzo has exceptional balance and handles like a dream. 

Like all Bowtie replaceable-armed quads, an extra arm is included!

NOTE: The kit requires 2x 28mm M3 standoffs and 4x M3 standard nut (not nylock) to complete. While Armattan Productions does not carry these components, you can obtain the standoffs at Armattan quads, and the M3 nuts are available at most hardware stores and multiple online vendors. The price of the kit has been reduced, compared to bowtiemultirotors.com, to compensate for this.

The Mad Hatter is a compact build, with minimal thrust blockage. With the some care, the Hatter can be built with only 25mm between the center plates and camera deck--an ultra-compact profile for mass centralization. The arm attachement profile forms the "Cumberbund of Strength"...a continuous perimeter of 4+2+2mm high quality carbon fiber sandwich.  A minimal cross-section and low weight make this a great racing quad, with a quick 3-bolt changeout if you manage to break an arm (spare included!) At 222mm and <100 grams with hardware, the 6" Mad Hatter can be built with crazy power to weight ratios. Go mad!

Check out the RCGroups thread at: http://www.rcgroups.com/forums/showthread.php?t=2659784

The Mad Hatter is an incredibly compact build, with arms that narrow in the middle, where the stresses are lower, for minimal thrust blockage. With the some care, the Hatter can be built with only 25mm between the center plates and camera deck--an ultra-compact profile for mass centralization. The arm attachement profile forms the "Cumberbund of Strength"...a continuous perimeter of 4+2+2mm sandwich of high quality carbon fiber.  A minimal cross-section and low weight make this a great racing quad, with a quick 3-bolt changeout if you manage to break an arm (spare included!) At 162mm and <75 grams with hardware, the 4" Hatter is agile enough to let your thumbs and imagination be the limit.

Check out the RCGroups thread at: http://www.rcgroups.com/forums/showthread.php?t=2659784

NOTE!!!  Armattan Productions does not carry the 2x 28mm standoffs and 4x flat M3 nuts required for the "hat" of the Mad Hatter. However, Armattan Quads (sister site and same company) *does* carry the standoffs, at http://www.armattanquads.com/28mm-black-anodized-aluminium-standoff-5-5mm-o-d/, and the nuts are available at most hardware stores and countless online vendors. I have reduced the Mad Hatter kit price (compared to my US site) by $6.80 to reflect the cost of the standoffs and their $5 shipping to anywhere in the world. If you order this "Mad Hatter 186mm -- Separate 28mm Standoff Purchase" kit, you must purchase those two standoffs separately. My apologies for the inconvenience, but this is the best way to provide reasonable shipping and service to international customers (I am based in the US.)

The Daft+ is a compact, lightweight plus-configuration quad. With the battery sharing drag with the front and back arms, it cuts through the air effortlessly...and looks great while it's at it. Try putting lights on the side arms for a unique signature when it zooms past.

An extra arm is included, to get you back in the air quickly in the event that you manage to break one.

NOTE: The kit requires 2x 28mm M3 standoffs and 4x M3 standard nut (not nylock) to complete. While Armattan Productions does not carry these components, you can obtain the standoffs at Armattan quads, and the M3 nuts are available at most hardware stores and multiple online vendors. The price of the kit has been reduced, compared to bowtiemultirotors.com, to compensate for this.