INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

Thanks to Everyone Who Voted for My Engine !

Thanks to Everyone Who Voted for My Engine !

(OP)
The results are in! My entry was in the Top 100 overall (of 868) and the Top 5 in the Aerospace and Defense category (of 115). The judging panel included 76 experts in their field from around the world. Though winning is always gratifying, I’m happy with the result. Thank you to all who voted!

By the way, the design continues to evolve based on inputs from my consultant and my own efforts to focus tightly on the aviation market (which will likely be last to be disrupted by battery electric systems), reduce risk, and cut prototyping costs. The first prototype will be a 50cc engine of 4.75" diameter and 3" thickness (including air cleaner and fuel injectors but not the electric motor/generator) having 8 cylinders completing 6 cycles each per revolution of the output shaft producing 3.3 HP at 2,626 RPM (low to eliminate the need for a propeller reduction unit) with 55% efficiency at up to 18,000 foot altitude. The engine will be machined using the $5,000 5-axis Pocket NC V2 mill and demonstrated using an off-the-shelf radio-controlled RQ-7 model (about 1/2 scale).

Many aspects of the design have come into clearer focus as I've continued working. I'll now concede that the engine is variable compression, that the use of two pistons for the HCCI process is not required from a thermodynamic perspective (the second piston serves primarily to effect a piston gated port in a position that facilitates uniflow scavenge while simultaneously facilitating rapid piston motion via its low mass). Note peak pressure is now below 220 bar to prevent ignition of lubricating oil, max temperature is below 2100K to prevent NOx formation, and ignition occurs after compression is complete in all cases.

https://contest.techbriefs.com/2017/entries/aerosp...

RE: Thanks to Everyone Who Voted for My Engine !

RodRico
Congratulations: I see your engine showed up on page 22 of the November Tech Briefs as having an honorable mention.
B.E.

You are judged not by what you know, but by what you can do.

RE: Thanks to Everyone Who Voted for My Engine !

(OP)
Thank you Berkshire. I didn't know I'd be in the print mag. I wish I could download the issue, but I can't find it anywhere. :(

RE: Thanks to Everyone Who Voted for My Engine !

Rod,
Why don't you write to them at Tech Briefs Media Group , 261 Fifth Avenue, Suite 1901 New York New York 10016. Explain who you are and ask for a copy of the magazine.
Or you could call them at 212 490 3999.
B.E.

You are judged not by what you know, but by what you can do.

RE: Thanks to Everyone Who Voted for My Engine !

(OP)
Berkshire,

Good idea, thanks! I used to work in aerospace and defense, and have also asked former collegues if anyone has a copy.

Rod

RE: Thanks to Everyone Who Voted for My Engine !

I'll wait till we see a running example, and proof test for durability etc.

RE: Thanks to Everyone Who Voted for My Engine !

You'll wait... to do what exactly?

RE: Thanks to Everyone Who Voted for My Engine !

Vote on it.

RE: Thanks to Everyone Who Voted for My Engine !

(OP)
Many of the engineers on my old R&D team said "until you have test results, you can't be sure it will work as you claim." They seem to have forgotten the way I used to get them work was by writing technical proposals describing things we hadn't yet built. They made a living for about 20 years off my selling ideas I could substantiate with preliminary analysis but not prove. Of course my customer was the military R&D labs, so they understood that starting something requires a leap of informed faith.

RE: Thanks to Everyone Who Voted for My Engine !

Now you are all set then.
B.E.

You are judged not by what you know, but by what you can do.

RE: Thanks to Everyone Who Voted for My Engine !

I will be interested to see how long the hydrodynamic cam followers survive, given the high surface speed and the varying curvature of the cams.

I wish you well with the challenges that await.

Mike Halloran
Pembroke Pines, FL, USA

RE: Thanks to Everyone Who Voted for My Engine !

(OP)
Mike,

I'm interested too!

As part of my de-risking efforts and focus on the aviation market, I've cut RPM to 2,626 (just a convenient number... half 5252). That should go a long way in reducing cam issues.

I will be performing some critical experiments before building the full prototype (though at 50cc displacement, many would say it's already far from "full"). One of the first experiments will entail spinning the cams using electric motors and applying follower loads so I can measure cam friction (indirectly via reaction torque) and general operation. There will be other experiments in the area of full engine motoring friction, fuel spray, etc.

Thanks for your good wishes!

Rod

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close