## Search found 856 matches

Sun Jun 07, 2009 9:58 am
Forum: Valveless pulsejet forum
Topic: Calculating top speed on ice...
Replies: 575
Views: 93705

### Vin Diesel

Hejsan Anders! Is it possible to get the engine to lock with a Rosscojector coupled to a small 5kg propane bottle? I will let Joe answer for himself, but I would think that the real problem here is the small size of the bottle. Assuming the rosscojectors are properly sized and the engine is self-sus...
Fri Jun 05, 2009 9:24 am
Forum: Valveless pulsejet forum
Topic: Calculating top speed on ice...
Replies: 575
Views: 93705

### Re: Moment arms in a one dimensional space

Ahoy, Anders! I start to think that backing off the throttle on the Thunderchine at some point during the run will be unavoidable... Aye...me thinks the same, matey! That I do. Self-preservation be a powerful thing indeed. This is why ye should complete the tow tests with ye snowmobile, sooner rathe...
Thu Jun 04, 2009 2:41 am
Forum: Valveless pulsejet forum
Topic: Calculating top speed on ice...
Replies: 575
Views: 93705

### Re: Moment arms in a one dimensional space

Hejsan Anders, The problem is that there is very little room for moving the CG and CP around. That is not the point . You need to know where the CG is relative to your position and that of the CP. Once you locate the CG, you may need to add weight (ballast) up in front to increase the separation. Ho...
Wed Jun 03, 2009 6:06 am
Forum: Valveless pulsejet forum
Topic: Calculating top speed on ice...
Replies: 575
Views: 93705

### Moment arms in a one dimensional space

Hejsan Anders! All steel tubing is bought for the kick ... will start to work on the final frame design next week. Cool! Before it is too late, make a list of the major subassemblies (eg., pulsejet and frame) and record the individual weights of each. You can also work out where the CG for each one ...
Tue Jun 02, 2009 1:15 pm
Forum: Valveless pulsejet forum
Topic: "Thunderchine" 55 lb thrust pulsejet plans
Replies: 142
Views: 58471

### Re: At the extremes of diameter

Update: At 30 C, Joe's "as-built" Thunderchine would be expected to resonate between 168-173 Hz . Thanks to Joe ("GRIM") and Tim ("wakmat"), this issue is now resolved. The 180 Hz fundamental first observed in Joe's Thunderchine (initial video) and subsequently , Tim's Thunderlite ( 188 Hz ) was co...
Wed May 27, 2009 4:22 am
Forum: Valveless pulsejet forum
Topic: Calculating top speed on ice...
Replies: 575
Views: 93705

### Re: Calculating top speed on ice...

.
weldion wrote:The third engine is almost finished now!
Yaaay!!

Cheers,
M.
Tue May 26, 2009 5:15 am
Forum: Valveless pulsejet forum
Topic: Calculating top speed on ice...
Replies: 575
Views: 93705

### Re: Full metal jacket, part II

.
Johansson wrote:Hopefully I'll keep from vomiting in the helmet during the race...
Thanks for sharing that! And I was just about to enjoy cake and coffee... No more, I think.

Cheers,
M.
Tue May 26, 2009 4:56 am
Forum: Valveless pulsejet forum
Topic: Noise, explosions, whats not to like...
Replies: 1
Views: 960

### Re: Noise, explosions, whats not to like...

.
Eric wrote: I love how the tail blast vaporizes the snow on the ground instantly, kind of reminds me of nuclear test videos...
Mwahahahaha!!!

Cheers,
M.
Tue May 26, 2009 2:53 am
Forum: Valveless pulsejet forum
Topic: Calculating top speed on ice...
Replies: 575
Views: 93705

### Full metal jacket, part II

. Have you thought about a light weight aliminium heat shield tunnel covering the entire intake augmentors area? That's a good idea, the shield would also help to keep billowing flames away from me in case of a flame out. Sorry mate, but this is a very bad idea . :( I agree with Jutte wrt. noise ra...
Tue May 26, 2009 2:20 am
Forum: Valveless pulsejet forum
Topic: Calculating top speed on ice...
Replies: 575
Views: 93705

### Full metal jacket, part I

Hejsan Anders! M., have you any idea how hot the ejectors will get during a run? Not that hot, considering the weather. If I had to guess, surface temperatures along the outside edges (where you will be) will not exceed 60 C , and this does not account for the - 30 C ambient. Setting the engine fart...
Tue May 26, 2009 2:04 am
Forum: How to improve this site
Topic: New Nobody's! Lots and lots of them.
Replies: 12
Views: 6598

### Re: New Nobody's! Lots and lots of them.

.
Mike Everman wrote:Yeah, I may go to the first post approval thing.
Please DO. Not ALL of the new registrations are from bots. Bots do not exhange PMs with one another.

Cheers,
M.

Btw., psychoDave is back, with a new four-letter nick. And he brought along a meat puppet from work.
Fri May 22, 2009 1:08 pm
Forum: Valveless pulsejet forum
Topic: Lockwood simulations, wow
Replies: 22
Views: 5227

### Re: Lockwood simulations

Rossco is back! :D The plans have issues. M. may elaborate here. To be brief, when the plans were changed, and the 6.00 in. constant diameter section preceeding the u-bend was replaced with an 11.00 in. section , the design was compromised wrt . its acoustics. The original layout (6.00 in . tail cou...
Fri May 22, 2009 2:28 am
Forum: Valveless pulsejet forum
Topic: Lockwood simulations, wow
Replies: 22
Views: 5227

### Re: Lockwood simulations, wow

Rossco posted?! What happened?
GRIM wrote:How about a chineeze ??
How about a really Big chinese?

Cheers!
M.
Thu May 21, 2009 9:02 pm
Forum: Valveless pulsejet forum
Topic: Calculating top speed on ice...
Replies: 575
Views: 93705

### Go for it, Erik!

Hejsan Anders and Erik! Even holding it makes him look scared... Great shot, mate! :P This Thunderchine looks even better than the one Anders built. Practice makes perfect? We did a mock-up of the engine on Eriks veteran moped. ZOMG!! Go for it, Erik! :twisted: Cheers, M. PS: Glad that's not my ass....
Thu May 21, 2009 11:00 am
Forum: Valveless pulsejet forum
Topic: Calculating top speed on ice...
Replies: 575
Views: 93705

### Re: Hot wheels!

Hejsan Anders, I just received the first video clip. It is too big to post here , so I need to edit it down a tad or upload it to a suitable host. It starts up quick then runs right on the predicted frequency; this unit has the revised starting fences, and injectors with 3x ID 2 mm ports set in at 2...