O.S.Speed R21-M06 Minicars Marine Engine

Introducing the new 2025 O.S.Speed R21-M06 Minicars Special Edition 3.5cc marine racing engine made by O.S.Engine in Japan!

Features:

• New 2025: DLC coated & balanced R21 Euro-II crankshaft with more timing
• New 2025: 9-port cylinder liner with 3-port exhaust & new piston with 3 oil-grooves
• New 2025: Ceramic main ball bearing
• New 2025: Reinforced "R" conrod
• New 2025: RP6 Turbo plug (instead of RP7)
• New combustion chamber with smaller volume for lower nitro levels
• O.S.Speed developed black crankcase with Minicars Marine Laser Engraving
• Black anodized water cooling head with Minicars Marine Special Edition Laser Engraving
• Backplate with steel thrust plate for lower friction and increased durability
• No carb included - choose your own carburetor (15mm diameter neck)

Specs:

• Displacement: 3.49cc
• Bore: 16.08mm
• Stroke: 17.2mm
• Crankshaft dia: 14mm
• Practical r.p.m. Range: 4.000～43.000
• Output: 2.76hp @ 35.000r.p.m.
• Weight: 265g
• Water Cooling Nipple Thread: M5x0.8

Included:

• O.S.Speed R21-M06 2025-Edition Minicars Marine Engine
• RP6 Glowplug
• O.S.Speed flywheel cone
• O.S.Speed decal
• Printed Manual & partslist

Wholesale Distributed by Minicars Hobby Distribution AB.

Click HERE for more info

O.S.SPEED R21-M05 Minicars Marine 3.5

Introducing the new R21-M05 Minicars Marine 3.5 engine made by O.S.SPEED!

Note, this special edition is only available in Europe through Minicars Hobby Distribution AB's B2B dealer network.

Features:

• Newly developed O.S.Speed black crankcase with Minicars Marine Laser Engraving
• Black anodized water cooling head with Minicars Marine Special Edition Laser Engraving
• DLC coated & balanced "SG-type" crankshaft (4.5mm balance weights)
• 9-port cylinder liner with 3-port exhaust
• Backplate with steel thrust plate for lower friction and increased durability
• No carb included - choose your own carburetor (15mm diameter neck)

Suitable for competition boats (experience level ”high”):

• Hydroplanes
• Offshore (with gear deduction)
• Endurance (with gear reduction)

Recommended fuel:

• Hydroplanes: 25-60% nitro fuel with 8% Klotz Original Techniplate + 8% Klotz Benol oil
• Offshore: 16-40% nitro fuel with 8% Klotz Original Techniplate + 8% Klotz Benol oil
• Endurance: 16-40% nitro fuel with 8% Klotz Original Techniplate + 8% Klotz Benol oil
• Don't run the engine with less oil than the above recommended levels. You may add more recin/castor oil (Klotz Benol) in extreme conditions and heavy loads.

Specs:

• Displacement: 3.49cc
• Bore: 16.08mm
• Stroke: 17.2mm
• Crankshaft diameter: 14mm
• Practical r.p.m. Range: 4.000～43.000
• Output: 2.76hp @ 35.000r.p.m.
• Weight: 265g
• Water Cooling Nipple Thread: M5

Included:

• O.S.Speed R21M05 Minicars Marine Engine
• RP7 Glowplug
• O.S.SPEED decal
• Printed Manual & partslist

Click Here

PDF Drawings are Back Online

Thanks to Joe Petro at Zippkits.com the download pdf's for the KEP's & JAE Hydroplane Freebie's are now online again.

2019 ABC Prop Chart

Here is the latest prop chart from ABC (2019).

Download PDF here.

New IMPBA D-Hydro (45) SAW Record

IMPBA D-Hydro (45) SAW 2019 Record

Martin Truex Jr sets a new IMPBA record in D-Hydro (7.5/45) = 135.3 MPH / 217.74 KMH

Höstmöte & RC Båt Träff 2019

Höstmöte Offshore & Hydro samt R/C Båt Träff 2019

• Datum: Lördagen den 23:e November 2019
• Plats: Minicarshuset Enköping
• Samling: 09.30
• Start: 10.00
• Lunch: Om ni önskar lunch så kostar den 140:- i kontanter eller Swish - Notera att i lunchen ingår även fikat under dagen
• Anmälan: Obligatorisk (och bindande vad gäller lunchen). Anmäl er senast Söndagen den 17:e November till niklas@minicars.se – var god notera vid anmälan hur många ni kommer och hur många lunch ni önskar.

Dagordning (provisorisk):

• 09.30-10.00: Ankomst fika/frukost
• 10.00: Sektionsmöte Offshore & Hydro
• 13.00: Lunch
• 14.00: Fortsättning av mötet och efterföljande R/C Båt snack tills vi tröttnar...

Välkomna!

Mvh,

O&H sektionen - Mattias & Lelle

Mikael Sundgren 1950-2019

We have lost a big RC boating profile!

Wednesday August 21 we lost my friend Mikael Sundgren after a short illness.

I've known Mikael since the mid 80's when I shifted to hydroplane RC boats from racing off-shore boats before that. After we booth made a comeback to boating some 13-14 years ago, me and Micke have shared many trips to the ponds and races around Europe. He was the one I discussed technical solutions with whenever I had some doubts or that I just wanted his opinion.

He has also been very helpful and influential in the development and testing of all KEP's boats.

I've lost one of my best friends.

R.I.P.

The funeral service will be held at Pilgrimskapellet in Järfälla Wednesday September 18 at 13.30.

More info of the funeral service can be found HERE

Invitation Swedish iMBRA H&O League 2019

Here is the invitation to the Swedish iMBRA Hydro & Offshore League race in Oxelösund end of May.

Link to the invitation in English

Link to the invitation in Swedish

Link to the registration site

The race includes:

• iMBRA H&O League

• Nordic Champs 2019

• Swedish Champs Race 2

• NC2 (Norway Cup Race 2)

RC Boating Today - Episode 110

RC BOATING TODAY 110 from Maturo Entertainment Group on Vimeo.

RC Boating Today - Episode 108E

RC BOATING TODAY 108E from Maturo Entertainment Group on Vimeo.

RC Boating Today - Episode 107

RC BOATING TODAY 107 from Maturo Entertainment Group on Vimeo.

Höstmöte & R/C Båt Träff 2018!

Höstmöte FSR-O & H samt R/C Båt Träff

• Datum: Lördagen den 17 November 2018
• Plats: Minicarshuset Enköping
• Samling: 09.30
• Start: 10.00
• Lunch: Om ni önskar lunch så kostar den 140:- i kontanter eller Swish - Notera att i lunchen ingår även fikat under dagen
• Anmälan: Obligatorisk (och bindande vad gäller lunchen). Anmäl er senast Söndagen den 11:e November till niklas@minicars.se – var god notera vid anmälan hur många ni kommer och hur många lunch ni önskar.

Dagordning (provisorisk):

• 09.30-10.00: Ankomst fika/frukost
• 10.00: Sektionsmöte FSR-O & FSR-H
• 13.00: Lunch
• 14.00: Fortsättning av mötet och efterföljande R/C Båt snack tills vi tröttnar...

Välkomna!

Mvh,

O&H sektionen - Mattias & Lelle

KEP's 21 World Champion 2018!

iMBRA 2018 Hydro World Championships Egletons France

Hydro 3.5 Results:

1. Martin Fields - UK - 1169p - KEP's 21
2. Keith Burgess - UK - 927p - KEP's 21
3. Dominique Marzolf - France - 863p - Rocket
4. Mattias Bengtsson - Sweden - 575p - KEP's 21
5. Benoit Argoud - France - 519p - KEP's 21
6. Christian Hoff - Germany - 475p - Warlok (edited)
7. Winfried Ott - Germany - 450p - JAE
8. Markus Schwab - Germany - 25p - ?

Photo Gallery from the Worlds

Complete Results from the Worlds

SAW Nitro Record 134MPH = 215 KPH

SAW Nitro World Record 134MPH = 215 KPH!

Earlier this April Martin Truex Jr set a new straightaway world speed record in a SAW event in Huntsville with an impressive 215 KPH!

• Average 2-way speed: 134 MPH (215 KPH)
• Fast past: 135.054 MPH (217 KPH)
• Motor: CMB VAC .91
• Prop: ABC 2727 - 19° rake - 38% blade area
• Radio: Futaba

RC Boating Today - Episode "106"

Episode 106 from Maturo Entertainment Group on Vimeo.

KEP's T3-45 V2 Freebie

Presenting the updated KEP's T3-45 V2 Freebie!


Main KEP’s T3-45 V2 News (compared to the earlier KEP’s T3-45):

• New Turn-Fin Mount!
• New Turn-Fin!
• New Sponsons to accommodate the new turn-fin mount!

Other Features:

• New Turn-Fin. The new shape makes it more planted on the water and its easier to turn left.
• New Turn-Fin Mount: The new plate mount is more rigid and is easier to make. It can be made in high strength carbon or hard aluminium.
• Kick Up. The rear part of the tub bottom has a kick-up of 2 mm (The original T3-45 had that also).
• Longer sponson ride-pads. Improves rough water handling.
• Slightly new nose section of the tub. Even more rounded nose block plus a little stretched-out side profile in the nose.
• 3 mm longer C-C spacing of the sponson tubes. That is to accommodate a slightly bigger tank.
• Top deck leaning forward. The tub deck where the cowl sits is leaning forward (as it also did on the earlier version).
• Optional ski designs. The ski’s are the same as the earlier T3-45. The optional ski with strakes on the flat running surface improves the tracking and side stability but it’s bit more difficult to do.
• Longer fuel cell. The earlier T3-45 tank still fits but now you can make it 3 mm longer for more fuel capacity. It’s more common now to make the tanks in plastic and that takes away volume as they use thicker material.

Specifications:

• After plane length: 650 mm (26.6")
• Overall length from transom to the tip of the sponsons: 900 mm (35.45")
• Outside-Outside sponson spacing: 560 mm (22")
• Tub length: 796.5 mm (31.36")
• Tub inside width: 76 mm (2.99")
• Tub outside width (with 6 mm thick sides): 88 mm (3.46")
• Tub height: 55 mm (2.16")
• Sponson width: 34 mm (1.39")
• Sponson ride pads (removable): 2 x 40 x 200 mm (.079" x 1.57" x 7.87")
• Ride pads AoA: 3.6°
• Ski width: 40 mm (1.57")
• Ski AoA: 1.5°
• Belly height: 24.8 mm (.98”) (from belly to the drink)

Recommendations:

• Futaba 4PV radio
• 2x Futaba S3172SV mini servos for channel 2 & 3
• Futaba BLS571SV low profile steering servo
• Vapex 1600 mAh 2S LiFe receiver battery
• 8 x 10 mm pultruded carbon sponson tubes (550 mm long)
• 10 x 12 mm aluminum tubes for the tub and sponsons
• 2x12 mm steel pin for securing the sponson tubes (much better then any other securing system we've tried by far).

Fuel Cell Manufacturers:

• Ian’s Boats - Welded Plastic tanks with brass nipples - www.iansboats.co.uk
• Walter Barney - Stainless tanks with brass tubes - wjbarney@tds.net
• John Steltzer - Stainless tanks & stainless tubes - johnstelzer@yahoo.com

Note, this is the last giveaway freebie rigger design I have planned to do. So: Build it. Race it. Enjoy! :)

KEP's T3-45 V2 Main Drawing - The Freebie drawings paper size: 980 x 594 mm. Make sure that it's printed 1:1 scale / 100% size. Click HERE for download (works best on a stationary normal PC/Mac).

KEP's T3-45 V2 Templates Drawing - The Freebie drawings paper size: A1 = 841 x 594 mm. Make sure that it's printed 1:1 scale / 100% size. Click HERE for download (works best on a stationary normal PC/Mac).

If you have the earlier KEP's T3-45 "V1" - Click HERE for a download of an updated "V2" fin that is adapted for the T3-45 "V1" turn-fin mount. This turn-fin does not fit the T3-45 V2 boat as it has a different turn-fin mount!

This is a size comparison with the KEP's T3-45 V2 (top) and the T3-21 V2 (on the bottom).

KEP's T3-21 V2 Freebie

Presenting the updated KEP's T3-21 V2 Freebie!


Main KEP's T3-21 V2 News (compared to the KEP's T3-21 "V1"):

• New Turn-fin Mount!
• New Turn-Fin!
• New Sponsons to accommodate the new turn-fin mount!

Other Features (vs the earlier T2-21):

• Flat sided sponsons. It really does not matter if the sponson top-view is elliptical, as the earlier T2, or flat sides as the new T3 - there are no performance benefits with elliptical so I changed it to flat sided instead. The new flat sided sponsons are much easier to build also!

• Longer sponson ride-pads. Improves rough race water handling.

• Improved side profile of the sponsons. Creates less lift and less water drag (from the spray behind the ride pads).

• Lower AoA of the sponson ride pads. Improved handling in heat-racing conditions.

• Longer after-plane. It makes it a tiny bit better in rough sea (other improved items makes more of a difference though).

• The tub is leaning forward (lower in the front then in the back). Improved ride that overall creates a better stance of the complete boat on the water.

• Slightly different nose shape of the tub.

• Wider spacing on the sponson tubes (front & rear). Improved rigidity. As the tub now leans forward the tube centers are also adjusted so they are parallel to the water.

• Channel 2 & 3 servos sit on either side of the flex and the receiver on the tub floor. Much easier to fit the mini servos.

• Wider ski with improved AoA. Better in rough water and it's easier to maintain the overall boat AoA everywhere on the course.

• Optional ski design with rakes on the running surface. Improved side stability in the corners and on the straights.

Specifications:

• After plane length: 550 mm (21.65")
• Overall length from transom to the tip of the sponsons: 765 mm (30.12")
• Outside-Outside sponson spacing: 500 mm (19.69")
• Tub length: 682 mm (26.85")
• Tub inside width: 62 mm (2.44")
• Tub outside width (with 4 mm thick sides): 70 mm (2.76")
• Tub height: 47 mm (1.85")
• Sponson width: 23 mm (.91")
• Sponson ride pads (removable): 2 x 30 x 165 mm (.079" x 1.18" x 6.5")
• Ride pads AoA: 3.4°
• Ski width: 35-40 mm (1.38-1.57")
• Ski AoA: 1.4°
• RTR Weight (without fuel): around 1650 g (58.2 oz)

Recommendations:

• Futaba 4PLS radio
• 2x Futaba S3172SV mini servos for channel 2 & 3
• Futaba BLS571SV low profile steering servo
• Vapex 1000 mAh 2S LiFe receiver battery
• V.S. Third channel fuel metering base with O.S. needle
• V.S. Speed 2101M motor
• Note: the T3-21 works equally well with an in-line engine. It will run a tad bit lighter in the front though but that is NO problem.
• Hipex 180° Exhaust Manifolder
• Hipex MP1-21 Hydro Muffled Parabolic Pipe
• Walter Barney @ Tanks 2U made SS tank T2/T3 (same size)
• 8 x 10 mm pultruded carbon sponson tubes (475 mm long)
• 10 x 12 mm aluminum tubes for the tub and sponsons
• 2 mm carbon rod for securing the sponson tubes (much better then any other securing system we've tried by far).
• Propeller: The T3-21 is not that critical regarding props I think and it depends on how you race and drive. For me personally I like an "easy" prop with not that much cup but with a a bit more COB pitch so you get good acceleration. I also like to be able to throttle at all times so that means I don't like props that are heavy on the engine and I don't use that short pipe lengths either. All props I've used are done by Mark Sholund and the ones Ive used the most are ABC 50x69 with 45.25 mm dia, 2.81 COB pitch and 3.33 cup. The ABC H6 with 45.9 dia, 2.9 COB pitch and 3.33 cup works fine also and they let you rev the engine quite easily.

Extra T3-21 V2 info:

• The current KEP's T3 design is based on "3-point flat-plane technology" that means they run very light on the water. This type of outrigger design rely on a good balance between aerodynamics, hydrodynamics, center of weight, how much weight you have on each of the 3-points, rudder and the turn-fin. If you build the T3-21 V2 according to the plans and don't make any of your own design or geometric changes - then there is plenty of adjustment in the changeable/removable ride-pads, the changeable/removable ski and the strut height/angle.
• Please make the V2 turn fin according to the plan and bend it to the specs. DON'T use any other turn fin shape and/or hook. (Make sure its sharpened properly also on the leading edge only.)
• Don't place the turn fin too far forward. The boat will "dart" (wanting to continue to turn coming out of the corners) and it will be difficult to keep straight.
• If your T3 is pulling to the right at speed on the straights: Double check that you have mounted the sponsons straight vs the tub - If not - correct that. If it still pulls to the right, check that the turn-fin is sharpened correctly and not dull on the leading edge. A turn fin that is not sharp will make the T3 to pull to the right even at slower speeds.
• If you want some building tips etc - look to the right in the menus for the earlier T2-21 Build Series I did. The T2 and T3 is not exactly the same but you will get a feel for how to build one. If scratch building is not your thing though - go to Zipp Kits and buy a JAE 21G2 Kit instead and start learn to build on that. :)

KEP's T3-21 V2 Main Drawing - This pdf includes all the templates you need. The Freebie drawing is in A1 size (paper size: 841 x 594 mm). Make sure that it's printed 1:1 scale / 100% size. Click HERE for download (works best on a stationary normal PC/Mac).

KEP's T3-21 V2 Extras Drawing - This pdf includes some extra measurements. There is no real need for printing this one. The Freebie drawing is in A1 size (paper size: 841 x 594 mm). If you chose to print this one also make sure that it's printed 1:1 scale / 100% size. Click HERE for download (works best on a stationary normal PC/Mac).

KEPs T3-21 V2 Optional Ski with strakes. This extra optional Freebie drawing is A3 size (paper size: 297 x 420 mm). If you chose to print this one also make sure that it's printed 1:1 scale / 100% size. Click HERE for download (works best on a stationary normal PC/Mac).

If you have the earlier KEP's T3-21 "V1" - Click HERE for a download of an updated "T3-21 V2" fin that is adapted for the T3-21 "V1" turn-fin mount.

KEP's FE-4S V2 (P-Open) Freebie

Updated V2 version (2017-11-22)!

Freebie drawing of the new updated KEP's FE-4S V2 P-Open 4-cell LiPo Brushless in-runner Outrigger Electric Hydroplane.

• No more toe-in on the turn-fin!
• Updated V2 turn-fin mounting!
• Updated V2 sponsons to accommodate the new turn-fin mount!
• New V2 turn-fin!

Note, the KEP's FE-4S is a P-Open 4 cell LiPo outrigger. The boat can be fitted with brushless in-runner marine motors with physical dimensions of 36 or 40 mm diameter that are 65-74 mm long (note, it's physically possible to actually use motors up to 80 mm long but at those lengths it gets more difficult to make a nice cowling and the clearance towards the rear sponson tube is less "wrench friendly").

There is also an slightly smaller freebie version available for the P-Limited class they run in the US (with Aquacraft 3650-2030KV motors). That boat is called KEP's FE-4SL - click HERE for info and download of that. But if you just want to build one of these I recommend building this one as it also works with the smaller P-Limited Aquacraft motor.

Note, if you plan to go fast - let's say above 100-110 km/h - then you need LOT's of water cooling to stay below 90°C on the ESC. Use at least 4 mm tubes in the tub and matching large silicone tubes. Make an efficient and short cooling loop so the water will flow as much, and easy, as possible. It might be needed also to add a second water pick-up to cool the motor separately.

If you want some inspiration for building your own KEP's FE-4S rigger - Click Here (lot's of build pictures)

Specs:

• Made for 36x65-74 mm and 40x65-74 mm motors
• Tub Length: 689 mm (27.126")
• Total Length, from transom to sponson tips: 754 mm (29.69")
• Tub Width: 84 mm (3.31")
• Tub Height: 51 mm (2")
• After Plane: 537 mm (21.14")
• Sponson Length: 442 mm (17.4")  
• Sponson Width: 23 mm (.09")
• Sponson Ride-Pad Width: 30 mm (1.18")
• Sponson AoA: 3.9°
• Ski Width: 30 mm (1.18")
• Ski AoA: 1.4°

Main drawing of the KEP's FE-4S V2 (1of2). Download it HERE. The PDF size is A1 = 841x594 mm. When you have had this printed out in 100% size you will cut the lower part away to make the actual templates etc.

Complementary drawing of the KEP's FE-4S V2 (2of2). Download it HERE. The PDF size is A1 = 841x594 mm. This one includes some extra info, extra measurements and some set-up tips etc.

If you already have built the original FE-4S (P-Open), or the FE-4SL for that matter, then you can update it with the New V2 Turn-Fin. Make sure you remove all toe-in on the turn-fin mount though!