The head came with something melted into it. No response from customer support.

A great addition to my Red HM-01. These are my two favorite engines in my collection. I’m am extremely happy with them and highly recommend EngineDIY

I couldn’t be happier with this phenomenal instrument. It’s made really well and functions as intended. The see-thru enclosure is a bonus. I was easily able to light up a 120V AC LED lightbulb from a distance of about 8-10cm

A+++

The engine arrived today, it was well packed. After topping up with 95 petrol and 2t oil at 1:25 , putting the batteries in, it took 4 kicks on the starter for the engine to come to life. Very easy to adjust the timing and it runs very well. It looks good and is well machined.

I have used several different igbition modules over the years for my models, from home built, to the less expensive units, to the high priced ones, and this one overall in my opinion, outshines them all. The proce is right and its effectiveness is excellent. I orfered two at the same time, one to put immediately into service, and the second as a stand by. Install os pretty straight forward and should not pose any problems if a bit of plannimg was done ahead of time. The unit will function on just two AA batteries instead of the three that eas mentioned on the limited intructions.

tres bon petit moteur montage bien expliquer et fonctionne bien j'utilise de l'aspen 2

The item arrived extremely well packaged, the build quality is mind blowing and the attention to detail it’s a credit to the designers even the wheels have small brass rivets holding the spokes to the wheel rim and even a rose joint on the draw bar, I have the HM one engine that I need to assemble, but this is a winter project thank you

This is a beautiful model, but I have some issues with the build. There are several hundred tiny bolts and nuts, and fixing these is the major part of the build. They are too small for fingers, so tools are required, but the tools provided are not up to the job. Fortunately, I had a set of drivers and spanners for small fixings which helped, but even so I needed to modify the spanner. I found that the best method was to sit the parts to be assembled vertically so that I could drop the bolts into the holes and gravity would hold them in place. I then put cellotape across one side of the spanner to hold the nuts in place as shown in the photo. This allowed me to present the nuts to the bolt thread to get them started, then I used the spanner provided to tighten them. I feel that for the price of this model it should come with suitable tools that would make the assembly much easier. This is my biggest gripe and the reason that I, reluctantly, have given only four stars. But it is not the only problem. Three bolts could not be fixed because they clashed with other parts: two clashed with the gearbox brackets and one with a base for a part near the tail that isn’t even used (curiously, there are two unused bases near the tail). Also, the charging jack does not fit nicely into the charging port so it provides only intermittent power. This is a big problem, because it means that I can’t recharge the batteries. Also, the charging LED is hidden from view under a cover, which is not helpful. My final complaint is that when I first opened the box I found that all the parts were covered in a black dust, presumably from the packaging material, and I had brush them clean.

Real good model. Ran as it should right out of the box. Interesting learning toy. My grandkids love the whole presentation. The lights on the spinner and the engine running they stay fascinated by it.

Great product, good instructions

I was very excited and restless to take delivery of this beauty. However, when it arrived and opened, I found that the box the engine was in had damage and signs of packing failure. The mailing box showed no signs of damage. My hrart sank when I discovered that the tiny, scale sized wingnut that secures the air filter cover eas all bent up. I reported this damage two weeks ago and am still awaiting the final word as to when I will receive this damaged piece. I am hopeful Engines DIY will make good as they say they will. Question remains, when? I will append this review, once I have gotten the damaged part, but until thst time, three starz only. Other than that, it truly is an amazing piece of work to behold.

This is a basic entry-level RC helicopter, good for beginners. The handheld remote is easy to understand after reading the instructions. The helicopter’s design is simple, and it comes with spare rotor blades, which is a nice bonus.

The left stick on the controller controls throttle and collective pitch, while the right stick is for cyclic pitch. However, the right stick doesn’t fully translate to accurate flight control—the helicopter mostly hovers and spins slowly unless the right stick is constantly adjusted. The tail rotor only kicks in during certain maneuvers, which limits directional control.

Overall, it’s a decent starter model for someone new to RC helicopters and works well as a learning tool before investing in more advanced models.

Side note: The rechargeable battery takes about 45 minutes to 1 hour to fully charge. It lasts around 10 minutes at full throttle, or about 15–20 minutes at moderate or idle throttle.

Built the small-scale Trent 900 model jet engine in about 1.5 hours. Instructions were in another language, but I followed the pictures and had no issues. The engine is very durable, runs smoothly, and works even better with a little multipurpose aerosol spray lubricant. Looks and functions very realistically—great model overall.

Side note: The two main bearings are a little stubborn to fit into the FWD and AFT sections. I recommend using any household or garage lubricant to help slide them into place easier.

This is my 2nd purchase of the wood base and fuel tank for the HM-01. High quality and good construction. Highly recommend.

Received this engine several weeks ago and wanted to run the engine several times before writing this review. While the engine looks fantastic and is made from high quality engineered components, it's let down by a number of design issues which means it will never run properly. The cylinders are too large and encased in a big block of aluminium that draws all the heat out of the steam, consequently the boiler is simply too small to run this engine properly. The water level tube on the boiler is made of frosted plastic and impossible to see the water level. The burner is an open cup that you fill with methylated spirits and ignite, it has no handle so once it's burning you can't remove it from the engine if you need to extinguish it in a hurry. The burner flares up from time to time and you can have a 15cm flame shooting out the top of the flue. I actually find the burner to be quite scary to use and consider it to be dangerous! It takes two refills of the burner to get the boiler and the large metal engine warmed up, and a third refill to get the engine running. While the engine then runs smoothly, it doesn't run for long and doesn't have much power.

I feel like this product hasn't been developed properly and none of the design flaws corrected before it was released for sale.

If you're looking for a static display model then this engine does look impressive. However if you're looking for a working model engine then I would suggest looing at something else.

Very nice engine model, easy to build and precisely reflects the real motor. Parts precision is impressive and fit is amazing. Instructions are simple yet comprehensive.
I own now 3 Teching Jets, turobofan, fighter turboshaft and heli turboshaft. All excellent. Hope there will be a turbo prop.

I was looking really forward to the new Retrol - Okmo 185 miniature engine to be released and couldn’t wait to order it from EngineDiy.com! I ordered it and it was at my doorstep in 5 days. It arrived packed very safely in a beautifully decorated box, that shows that Okmo & Retrol are proud of this engine… packed in a ‘bulletproof’ foam core specially designed for the 185 engine that assured its safe arrival - no matter how it was handled during the trip from China to me here jn the USA. To me, it really says a lot when a company puts a lot of time and effort into their presentation and packaging… definitely impressed!

I chose the pulley drive version of the 185 for a couple reasons; the poly version gives the owner the choice to start the engine from the PTO pulley, or the rear starting clutch shaft. The pulley version includes two stainless starting shafts for each starting location.

The 185 arrives completely assembled and ready for fuel and three AA batteries that provide power to the mechanical ignition trigger switch, something that I thought was really cool to see on a model engine. Typically our model engines have a hall effect sensor, or a reed switch to trigger the CDI to fire the spark plug. The 185 uses a mechanical switch to trigger the spark, which is a very reliable design that doesn’t burn out.

For fuel I chose to use Coleman camping fuel, with a very small amount of marvel mystery oil for for the break-in period. I premixed my fuel & Marvel oil at around 60:1 which will give the engine a little additional lubrication while the piston ring seat during break in - run in period.
The engine has a very unique and complex oiling system that utilizes a gear type oil pump to pump oil through the crankshaft, the connecting rod and out the wrist pin to ensure lubrication of the piston. Oil also travels up the copper pipes and drops from the valve cover down to the camshaft and tappets ensuring cam lubrication. The piston has a true oil scraper ring that allows the engine to run very clean and not burn oil. i gotta give Mr. Jin big applause here 👏

I filled the crankcase with 6ml of 4 stroke 10W30 oil, installed 3 AA batteries, filled the tank with fuel and was ready to start.

* since this engine has a mechanical ignition switch, it’s absolutely important to make sure the 3 AA batteries are NEW for proper ignition. I initially used three AA batteries that I thought were new and strong and it caused the engine to be very difficult to start and run erraticly. Installing three brand new batteries made the engine start immediately and run perfectly *

I chose to start my engine using the pulley side starting shaft. Starting the 185 from the pulley side requires the cordless drill to be rotated COUNTERCLOCKWISE, where if you use the other starting shaft which is located at the back of the engine, the drill needs to rotate CLOCKWISE.

During my first run of my 185 I ran the engine at 1/2 throttle, positioned a fan to blow directly into the flywheel air inlet, which helped to keep the engine a little cooler during the running in period. The 185 engine likes a bit of throttle when starting, positioning the throttle lever at right at half throttle and a quick finger over the carb air inlet to choke and the engine starts immediately. Right out of the box. It is a very stable and well running machine. I only had to adjust the high-speed needle to richen the fuel mixture and my engine ran solid through the first tank of fuel.

The exhaust sound on the 185 is fantastic! it has a very powerful bark and all through the RPM range. It sounds amazing! I noticed the engine starts and runs even better after 2 full tanks of fuel, and I was able to slightly lean out the mixture which helps to make the engine more responsive to throttle input and low rpm runs.

I am thrilled with my 185 and looking forward to running a centrifugal water pump from the pulley drive soon. The engine has a lot of useable power can tell by the construction that it’s definitely built to last and perform.

OKMO & Retrol have done a phenomenal job in all aspects of their 185. The complex oiling system alone deserves a lot of recognition because it’s not common on many model engines today.

Mr. Jin the 185’s designer & engineer has really raised the standard with his OKMO Model company and looking forward to what he and Retrol creates in the future!!

The Okmo - Retrol 185 is an absolutely fantastic engine that I am very, very proud to own in my collection!

Got my motor approximately two or three days ago and I assembled it already put it all together and it is very high-quality and I look forward to building more motors!

The engine looks great and all the parts seem pretty good quality. There were some fairly difficult steps when a few parts were difficult to put together but the end product looks nice.

Everything spins freely but the 3V DC motor does not work at all when the power is turned on. Maybe I received a defective motor but I cannot find a customer service number to try calling for a replacement and most likely will need to purchase one separately, which is an unfortunate issue to experience when I spent a lot of money on this item. Initially the motor seems to want to spin but immediately stops.

For any prospective buyers just keep that in mind that this may not work as intended due to a non-working part and an inability to talk with a customer service rep.

I had to wait a bit longer than expected, it got here on the 17th of June and the box was a bit beat up. Everything is working perfectly because it was so well packed.
Thanks enginediy

Engine arrived in germany within 10 days. The engine is beautifully crafted and painted and ran
immediately on lighter fluid and a little two-stroke oil. The cooling pump is quite powerful, so I made
a cover for it to prevent splashing. Unfortunately, I didn't tighten the ground cable screw, so the CDI
module broke twice. It would have been nice if this screw had been included. A battery box is also
required.

Overall, a great engine with a nice sound. The exhaust I 3D-printed reduces the noise by 90%.

Chegou muito rápido no Brasil! Lacrado e muito bem embalado, muito satisfeito com a compra, agilidade da EngineDIY , recomendo a todos e desejo comprar novamente. 100% satisfeito

I loved assembling the beam steam engine kit . Everything went together well . I wish there was a bit more builder assembly rather than some pre-assembled parts but otherwise fantastic.

Hello, First I like to congratulate the desighn and manufacturing departments for there fantastic job. My kit is a work in progress but till now everything is going very well. The pastic parts do need a little adjustment but nothing serious. I added also a photo of my Radial 5 cylinder engine and my V8 engine. The turbofan is my favorite because I also worked on them in real life.
Thank you and hope to see more of this.

Willem

Had some difficulty in certain areas.